2015, 日本火山学会, 論文賞　　　　　　　　　　　　　　　

2012, 日本地震学会, 論文賞　　　　　　　　　　　　　　　

2005, 日本地震学会, 若手学術奨励賞　　　　　　　　　　　　　　　
Japan

北海道における北海道・三陸沖後発地震注意情報の認識状況とその地域差
林能成, 高橋浩晃, 元吉忠寛
社会安全科学, 14, Mar. 2024, [Peer-reviewed]
Japanese, Research institution, 38648993

Conceptual model of supercritical geothermal system in Shiribeshi Region, Hokkaido, Japan
Daisuke Oka, Makoto Tamura, Toru Mogi, Mitsuhiro Nakagawa, Hiroaki Takahashi, Mako Ohzono, Masayoshi Ichiyanagi
Geothermics, 108, 102617, 102617, Elsevier BV, Feb. 2023, [Peer-reviewed]
English, Scientific journal

Leveling survey and predicted vertical deformation around Atosanupuri volcanic group, eastern Hokkaido
Matsuda Mizuki, Ohzono Mako, Aoyama Hiroshi, Tanaka Ryo, Hirado Yuto, Okada Kazumi, Takahashi Hiroaki
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2023, 149, 149, The Volcanological Society of Japan, 2023
Japanese

Application of machine learning methods for detection of covolcanic ionospheric disturbances by GNSS observations data
A.S. Ten, N.V. Shestakov, A.А. Sorokin, N.N. Titkov, M. Ohzono, H. Takahashi
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 20, 1, 37, 54, Space Research Institute RAS, 2023, [Peer-reviewed], ［Internationally co-authored］
Russian, Scientific journal, 31015912

Tilt Observations on the Kamchatka Peninsula in 2012–2016
P. P. Firstov, E. O. Makarov, V. E. Glukhov, N. N. Titkov, N. A. Zharinov, H. Takahashi
Seismic Instruments, 57, 4, 424, 437, Allerton Press, Jul. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 31015912

Interseismic movement along the Luhuo-Daofu section of the Xianshuihe Fault from InSAR and GPS observation
Sun K, G. Meng, S. Y. Hong, X. N. Su, X. Huang, Y. F. Dong, H. Takahashi, M. Ohzono
Chinese Journal of Geophysics, 64, 7, 2278, 2296, Jul. 2021, [Peer-reviewed], ［Internationally co-authored］, [Domestic magazines]
Chinese, Scientific journal, 13225698

Investigation of Ionospheric Response to June 2009 Sarychev Peak Volcano Eruption
Nikolay Shestakov, Alexander Orlyakovskiy, Natalia Perevalova, Nikolay Titkov, Danila Chebrov, Mako Ohzono, Hiroaki Takahashi
Remote Sensing, 13, 4, 638, 638, MDPI AG, 10 Feb. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, Global Navigation Satellite Systems have been extensively used to investigate the ionosphere response to various natural and man-made phenomena for the last three decades. However, ionospheric reaction to volcano eruptions is still insufficiently studied and understood. In this work we analyzed the ionospheric response to the 11–16 June 2009 VEI class 4 Sarychev Peak volcano eruption by using surrounding Russian and Japanese GPS networks. Prominent covolcanictotal electron content (TEC)ionospheric disturbances (CVIDs) with amplitudes and periods ranged between 0.03–0.15 TECU and 2.5–4.5 min were discovered for the three eruptive events occurred at 18:51 UT, 14 June; at 01:15 and 09:18 UT, 15 June 2009. The estimates of apparent CVIDs velocities vary within 700–1000 m/s in the far-field zone (300–900 km to the southwest from the volcano) and 1300–1800 m/s in close proximity toSarychev Peak. The characteristics of the observed TEC variations allow us to attribute them to acoustic mode. The south-southwestward direction is preferred for CVIDs propagation. We concluded that the ionospheric response to a volcano eruption is mainly determined by a ratio between explosion strength and background ionization level. Some evidence of secondary (F2-layer) CVIDs’ source eccentric location were obtained., 13225698

Focal mechanisms and the stress field in the aftershock area of the 2018 Hokkaido Eastern Iburi earthquake (MJMA = 6.7)
Yuki Susukida, Kei Katsumata, Masayoshi Ichiyanagi, Mako Ohzono, Hiroshi Aoyama, Ryo Tanaka, Masamitsu Takada, Teruhiro Yamaguchi, Kazumi Okada, Hiroaki Takahashi, Shin’ichi Sakai, Satoshi Matsumoto, Tomomi Okada, Toru Matsuzawa, Hiroki Miyamachi, Shuichiro Hirano, Yoshiko Yamanaka, Shinichiro Horikawa, Masahiro Kosuga, Hiroshi Katao, Yoshihisa Iio, Airi Nagaoka, Noriko Tsumura, Tomotake Ueno
Earth, Planets and Space, 73, 1, Springer Science and Business Media LLC, Jan. 2021, [Peer-reviewed], [International Magazine]
English, Scientific journal, The tectonic stress field was investigated in and around the aftershock area of the Hokkaido Eastern Iburi earthquake (M_JMA = 6.7) occurred on 6 September 2018. We deployed 26 temporary seismic stations in the aftershock area for approximately 2 months and located 1785 aftershocks precisely. Among these aftershocks, 894 focal mechanism solutions were determined using the first-motion polarity of P wave from the temporary observation and the permanent seismic networks of Hokkaido University, Japan Meteorological Agency (JMA), and High Sensitivity Seismograph Network Japan (Hi-net). We found that (1) the reverse faulting and the strike-slip faulting are dominant in the aftershock area, (2) the average trend of P- and T-axes is 78° ± 33° and 352° ± 51°, respectively, and (3) the average plunge of P- and T-axes is 25° ± 16° and 44° ± 20°, respectively: the P-axis is close to be horizontal and the T-axis is more vertical than the average of the P-axes. We applied a stress inversion method to the focal mechanism solutions to estimate a stress field in the aftershock area. As a result, we found that the reverse fault type stress field is dominant in the aftershock area. An axis of the maximum principal stress (σ₁) has the trend of 72° ± 7° and the dipping eastward of 19° ± 4° and an axis of the intermediate principal stress (σ₂) has the trend of 131° ± 73° and the dipping southward of 10° ± 9°, indicating that both of σ₁- and σ₂-axes are close to be horizontal. An axis of the minimum principal stress (σ₃) has the dipping westward of 67° ± 6° that is close to be vertical. The results strongly suggest that the reverse-fault-type stress field is predominant as an average over the aftershock area which is in the western boundary of the Hidaka Collision Zone. The average of the stress ratio R = (σ₁ − σ₂)/(σ₁ − σ₃) is 0.61 ± 0.13 in the whole aftershock area. Although not statistically significant, we suggest that R decreases systematically as the depth is getting deep, which is modeled by a quadratic polynomial of depth.

The influence of elastic thickness non-uniformity on viscoelastic crustal response to magma emplacement: application to the Kutcharo caldera, eastern Hokkaido, Japan
Tadashi Yamasaki, Hiroaki Takahashi, Mako Ohzono, Tim J Wright, Tomokazu Kobayashi
Geophysical Journal International, 224, 1, 701, 718, Oxford University Press (OUP), 18 Nov. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal,
An elastic layer plays an important role in deformation of the crust. At active volcanoes, its thickness would be effectively thinned by a higher geothermal gradient, particularly in a region beneath which magmatic activity is relatively high. This study examines the influence of elastic thickness non-uniformity on viscoelastic crustal deformation by magma emplacement. A 3-D linear Maxwell viscoelastic model is employed, in which an elastic layer underlain by a viscoelastic layer with a spatially uniform viscosity is thinned to be hi in the volcano centre, compared with hi + Δh in the peripheral regions, and a sill-like magma emplacement occurs in the upper layer beneath the centre. It is found that the post-emplacement viscoelastic subsidence is diminished or enhanced by the elastic thickness non-uniformity, depending on whether or not the horizontal width of the magma emplacement (ωs) is greater than the horizontal width (ωe) over which the elastic layer is thinner. The available signature of the non-uniformity is explored by comparison with a model that has a spatially uniform elastic thickness (UET) of hi. If an apparent viscosity (ηa) of the UET model is adjusted so that the difference in post-emplacement subsidence is minimized at the deformation centre, the non-uniformity appears in the overall deformation field as a displacement anomaly over the perimeter of the sill in which viscoelastic subsidence is greater for the non-uniform model. The anomaly is, however, by no more than the magnitude of ∼15 per cent of the maximal syn-emplacement uplift, though ηa is necessarily modified to be ∼0.2–10 times the non-uniform model viscosity (ηc). If ωe is larger than a few times ωs, a weak signature is no longer expected in the deformation field, and ηa is not significantly deviated from ηc. Since the signature appears so faintly in a displacement field, the InSAR data in the Kutcharo caldera for a period from 1993 August 13 to 1998 June 9 do not allow us to capture the non-uniformity. However, it can be concluded that if ωe beneath the caldera is comparable with or greater than the topographic caldera diameter (ωc) as implied by the spatial variation of the geothermal gradient, the non-uniformity has no significant influence. Otherwise, if ωe < ωc, the non-uniformity influences the estimation of the crustal viscosity, but does not affect the overall deformation field. The elastic thickness non-uniformity can be theoretically captured in the deformation field, but in practice, its influence, particularly on estimating crustal viscosity, cannot be properly inferred without other geophysical data such as the geothermal gradient in and around the caldera.

Urgent Joint Seismic Observation Data of the 2016 Kumamoto Earthquakes
志藤あずさ, 志藤あずさ, 光岡郁穂, 松本聡, 松島健, 相澤広記, 清水洋, 内田和也, 神薗めぐみ, 神薗めぐみ, 手操佳子, 手操佳子, 中元真美, 中元真美, 宮町凛太郎, 宮町凛太郎, 一柳昌義, 大園真子, 岡田和見, 勝俣啓, 高田真秀, 高橋浩晃, 谷岡勇市郎, 山口照寛, 小菅正裕, 東龍介, 内田直希, 江本賢太郎, 太田雄策, 岡田知己, 海田俊輝, 小園誠史, 鈴木秀市, 高木涼太, 出町知嗣, 中原恒, 中山貴史, 平原聡, 松澤暢, 三浦哲, 山本希, 今西和俊, 内出崇彦, 吉見雅行, 青井真, 浅野陽一, 上野友岳, 藤田英輔, 阿部英二, 飯高隆, 飯高隆, 岩崎貴哉, 岩崎貴哉, 加藤愛太郎, 蔵下英司, 酒井慎一, 酒井慎一, 椎名高裕, 椎名高裕, 芹澤正人, 田中伸一, 中川茂樹, 平田直, 平田直, 増田正孝, 宮川幸治, 八木健夫, 渡邉篤志, 後藤和彦, 伊藤武男, 奥田隆, 寺川寿子, 堀川信一郎, 前田裕太, 松廣健二郎, 山中佳子, 渡辺俊樹, 飯尾能久, 片尾浩, 加納靖之, 加納靖之, 津田寛大, 三浦勉, 村本智也, 村本智也, 山下裕亮, 大久保慎人, 山品匡史, 大倉敬宏, 中尾茂, 平野舟一郎, 宮町宏樹, 八木原寛
地震, 73, Nov, 149, 157, Oct. 2020, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, 30657996

3‐D Intrinsic and Scattering Seismic Attenuation Structures Beneath Kyushu, Japan
A. Shito, S. Matsumoto, T. Ohkura, H. Shimizu, S. Sakai, Y. Iio, H. Takahashi, H. Yakiwara, T. Watanabe, M. Kosuga, T. Okada, M. Yoshimi, Y. Asano
Journal of Geophysical Research: Solid Earth, 125, 8, American Geophysical Union (AGU), Aug. 2020
Scientific journal, The attenuation of seismic wave energy is caused by intrinsic absorption and scattering. The former involves the conversion of seismic wave energy to heat energy via internal friction due to the anelasticity of the medium, whereas the latter involves the scattering of seismic wave energy due to random elastic heterogeneities in the medium. Quantifying both intrinsic ((Formula presented.)) and scattering ((Formula presented.)) attenuation is therefore important for understanding the physical properties of the Earth's interior and predicting seismic wave propagation. Here we develop a new procedure to separately map three-dimensional (3-D) (Formula presented.) and (Formula presented.) structures. The path-averaged (Formula presented.) and (Formula presented.) values are obtained via an envelope-fitting approach that employs a multiple-scattering model. The path-averaged (Formula presented.) and (Formula presented.) structures are then mapped into 3-D space using a tomographic inversion technique based on sensitivity kernels, which are calculated from a Monte Carlo simulation of the radiative transfer equations. We apply this method to map the crustal structure beneath Kyushu, Japan, and obtain 3-D (Formula presented.) and (Formula presented.) structures for the 1–2, 2–4, and 4–8 Hz frequency bands. The spatial attenuation patterns are similar for each of the analyzed frequency bands, with the spatial variability in (Formula presented.) being more pronounced than that in (Formula presented.). The high- (Formula presented.) and (Formula presented.) regions correspond to the locations of active volcanoes. Conversely, the northern Kyushu area possesses low- (Formula presented.) and (Formula presented.) zones that correspond to low heat flow and Cretaceous granite, respectively. The overall (Formula presented.) and (Formula presented.) distributions correlate with thermal and geological structures, respectively.

3‐D intrinsic and scattering seismic attenuation structures beneath Kyushu, Japan　　　　　　　　　　　　　　　
A. Shito, S. Matsumoto, T. Ohkura, H. Shimizu, S. Sakai, Y. Iio, H. Takahashi, H. Yakiwara T, Watanabe, M, Kosuga T, Okada M, Yoshimi Y. Asano
J. Geophys. Res., Jun. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal

Evaluation for hypocenter estimation error in the southwestern Kuril trench using Japan and Russia joint seismic data
Ichiyanagi M, M. Valentin, D. Kostylev, Y. Levin, H. Takahashi
Earth Planets Space, 72, 1, 86, SPRINGER, Jun. 2020, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, The southwestern Kuril trench is seismically active due to the subduction of the Pacific plate. Great earthquakes in this zone have frequently induced fatal disasters. Seismic monitoring and hypocenter catalogs provide fundamental information on earthquake occurrence and disaster mitigation. Real-time hypocenter and magnitude estimates are extremely crucial data for tsunami warning systems. However, this region is located in the international border zone between Japan and Russia. The Japan Meteorological Agency and Russian Academy of Sciences have routinely determined hypocenters and issued earthquake information independently. Waveform data have not yet been exchanged internationally in real time. Here, we evaluated how a hypothetical Japan-Russia joint seismic network could potentially improve the hypocenter estimation accuracy. Experiments using numerical and observed data indicated that the joint network extended the distance over which hypocenters can be accurately determined over 100 km eastward compared to the Japan network only. This fact suggests that joint seismic data have the potential to improve the hypocenter accuracy in this region, which would provide improved performance in gathering disaster information at the moment of a tsunami warning.

Preface on special issue “The 2018 Hokkaido Eastern Iburi Earthquake and Hidaka arc–arc collision system”
Takahashi H., N. Takai, M. Chigira, G. Meng, S. Kita and T. Yamada
Earth Planets Space, 72, 65, May 2020, [Peer-reviewed], [Invited], [Lead author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 12272037

千島海溝南部での臨時情報の可能性を考える　　　　　　　　　　　　　　　
高橋浩晃
日本地震学会モノグラフ, 6, 35, 38, Mar. 2020, [Lead author], [Domestic magazines]
Japanese, Scientific journal

Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake
Tomo Shibata, Ryo Takahashi, Hiroaki Takahashi, Takanori Kagoshima, Naoto Takahata, Yuji Sano, Daniele L. Pinti
EARTH PLANETS AND SPACE, 72, 1, 23, SPRINGEROPEN, Feb. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthquake were detected in three of the six wells, even though they are located hundreds of kilometers from the epicenter. The groundwater level changes are qualitatively consistent with the volumetric strain induced by the earthquake. We analyzed groundwater level responses to the M-2 tidal constituent before and after the earthquake, but related changes in amplitude and phase shifts remained within the usual variation. Observed coseismic change was explained by the response to the M-2 tidal constituent component and the calculated volumetric strain for one of the wells, where groundwater level decreased. The observed change in the other two was found to be much greater than the corresponding estimates of the volumetric strain., 12272037

INVESTIGATION OF IMPACT OF THE EARTH MODEL TO COSEISMIC DISPLACEMENTS CALCULATION AND RESULTS OF THEIR INVERSION
G.V. Nechaev, N.V. Shestakov, H. Takakhashi
Успехи современного естествознания (Advances in Current Natural Sciences), №6 2020, 107, 112, Euroasian Scientific and Industrial Chamber, Ltd., 2020, [Peer-reviewed], ［Internationally co-authored］, [Domestic magazines]
Scientific journal, 13225698

ON APPLICATION OF METHODS OF GLOBAL NAVIGATION SATELLITE SYSTEMS FOR TSUNAMI EARLY WARNING IN THE KURIL-KAMCHATKA REGION
G.V. Nechaev, N.V. Shestakov, H. Takahashi, M.D. Gerasimenko, D.V. Sysoev
Успехи современного естествознания (Advances in Current Natural Sciences), №3 2020, 92, 98, Euroasian Scientific and Industrial Chamber, Ltd., 2020, [Peer-reviewed], ［Internationally co-authored］, [Domestic magazines]
Russian, Scientific journal, 13225698

Crustal Deformation of the Northeastern China after the 2011 Tohoku, Japan Mw 9.0 Earthquake Estimated from GPS Observations: Strain Heterogeneity and Seismicity
Meng G, X. Su, W. Wu, S. Nikolay, H. Takahashi, M. Ohzono, M. Gerasimenko
Remote Sensing, Dec. 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 13225698

Geodynamic Processes Preceding the Sea of Okhotsk Deep Earthquake of May 24, 2013, with Magnitude Mw = 8.3
P. P. Firstov, V. E. GlukhovE, O. MakarovN, A. ZharinovN, N. TitkovS, S. SerovetnikovH. Takahashi
Doklady Earth Science, 489, 1, 1372, 1375, Nov. 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English

The Current Crustal Deformation of Northeast China Deduced from GPS Observations　　　　　　　　　　　　　　　
Ji-Peng Yu, Guo-Jie Meng, Xiao-Ning Su, Shestakov Nikolay, Gerasimenko Mikhail, Takahashi Hiroaki, Ohzono Mako, Tai Liu, Cheng-Tao Li
Earthquake, 39, 3, 11, 27, Science Press, 01 Jul. 2019
Chinese, Scientific journal, Using the GPS data observed from northeastern China and southeast of Russian Far East over the period of 2012-2017, we derived a velocity field within the ITRF2014, by fitting GPS time series with a multi-term functional model incorporating annual and semi-annual signals, linear trend as well as offsets. Subsequently, we transformed the velocity field into a Eurasia-fixed velocity field and analyzed its spatial characteristics. By taking the multi-scale spherical wavelet approach, we calculated strain rate tensors and analyzed the spatial distribution of various resolving scales. Meanwhile, we investigated the contribution due to the post-seismic relaxation of the 2011 MW9.0 Tohoku earthquake, Japan and the background deformation field characteristics. The results show that if the relaxation effect of the great earthquake in northeastern Japan is not deducted, the velocity field relative to the Eurasian plate generally moved southwestward. The movements between Yilan-Yitong Fault and Nenjiang Fault is characterized by counter-clockwise rotation, but other regions moves southeastward with a good consistency in orientation and an increase in intensity east of Mishan-Dunhua Fault. The motions for the Dunhua-Mishan Fault and the Yilan-Yitong Fault are characterized by extensions of 3.96±0.04 mm/a and 0.71±0.05 mm/a, respectively. The fault-parallel motion is negligible for the two faults. Principal strain rates were dominated by NW-SE extension and NE-SW compression. The dilation rates show that it is undergoing compression for the southern portion of Yilan-Yitong Fault, northern end of the Nenjiang Fault and the southeast of Russian Far East. The deformations were generally oriented SE due to the post-seismic viscoelastic relaxation of the 2011 MW9.0 Tohoku earthquake, inversely proportional with the epicentral distances. The corresponding principal strain rates were also characterized by NW-SE extension and NE-SW compression. The dilations were characterized as contraction for the southern segment of the Yilan-Yitong Fault and the Mishan-Dunhua Fault, the northern end of the Nenjing Fault and Russian Far East. Localized maximum shear rates were identified around the southern borderland between northeastern China and the southeast of Russian Far East. After the subtraction of the contribution due to the viscoelastic relaxation from the observed velocity, the principal strain rates were also characterized by NW-SE extension and NE-SW compression. The dilation rates were significant in the southern end of the Yilan-Yitong Fault and the Mishan-Dunhua Fault, over the Second Songhuajiang Fault and the southern borderland between northeast China and Russian Far East. The maximum shear rates are still significant for the above regions, indicative of fast and continuing strain buildup there.

インタビュー：北海道胆振東部地震における揺れ方と震源の特徴
高橋浩晃, 谷内元, 早岡英介
科学技術コミュニケーション, 25, 51, 62, Jul. 2019, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal

Estimation of convergence boundary location and velocity between tectonic plates in northern Hokkaido inferred by GNSS velocity data
Ito C, H. Takahashi, M. Ohzono
Earth Planets Space, Jul. 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal

On determination of the Earth’s surface small “instant” vertical displacements by GNSS-techniques
TAKAHASHI Hiroaki
SOVREMENNYE PROBLEMY DISTANTSIONNOGO ZONDIROVANIYA ZEMLI IZ KOSMOSA, 16, 3, 33, 44, Jun. 2019, [Peer-reviewed], ［Internationally co-authored］, [Domestic magazines]
Russian, Scientific journal

Cause of destructive strong ground motion within 1-2s in Mukawa town during the 2018 M-w 6.6 Hokkaido eastern Iburi earthquake
Nobuo Takai, Michiko Shigefuji, Jun Horita, Shingo Nomoto, Takahiro Maeda, Masayoshi Ichiyanagi, Hiroaki Takahashi, Hiroaki Yamanaka, Kosuke Chimoto, Seiji Tsuno, Masahiro Korenaga, Nobuyuki Yamada
EARTH PLANETS AND SPACE, 71, 67, SPRINGEROPEN, Jun. 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal, We investigated the cause of destructive ground motion during the 2018 Hokkaido eastern Iburi earthquake. We conducted strong motion observations of aftershocks and microtremors and thesurface wave method in thedamaged areas of the town of Mukawa, Hokkaido prefecture, Japan. The ground accelerations were continuously recorded during a period of approximately 3months after the main shock on September 6, 2018. The heavily damaged buildings were mainly situated around the strong motion station (HKD126) in Mukawa town. Such concentration of damage can be explained by the strong power that was observed in the 1-2 s period of the response spectrum at this station. We estimated the S-wave velocity profiles of this station site and a temporary station site that was installed on a nearby hill. The estimated S-wave velocity, which was inverted from phase velocity structures with the microtremor array and the surface wave method observations explained the difference in the SH-wave amplification characteristics between the two sites. An analysis of HKD126 and the temporarily observed records clearly indicates the strong effects of thelocal geological conditions on the heavily damaged area of Mukawa. The strong ground motion power generated during the main shock in Mukawa for 1-2s periodwas mainly amplified by this shallow underground velocity structure.

The 2018 Hokkaido Eastern Iburi earthquake (M-JMA=6.7) was triggered by a strike-slip faulting in a stepover segment: insights from the aftershock distribution and the focal mechanism solution of the main shock
Kei Katsumata, Masayoshi Ichiyanagi, Mako Ohzono, Hiroshi Aoyama, Ryo Tanaka, Masamitsu Takada, Teruhiro Yamaguchi, Kazumi Okada, Hiroaki Takahashi, Shin'ichi Sakai, Satoshi Matsumoto, Tomomi Okada, Toru Matsuzawa, Shuichiro Hirano, Toshiko Terakawa, Shinichiro Horikawa, Masahiro Kosuga, Hiroshi Katao, Yoshihisa Iio, Airi Nagaoka, Noriko Tsumura, Tomotake Ueno, Koji Miyakawa, Shin'ichi Tanaka, Miwako Ando, Naoki Uchida, Ryosuke Azuma, Ryota Takagi, Keisuke Yoshida, Takashi Nakayama, Satoshi Hirahara, Yoshiko Yamanaka, Yuta Maeda, Shuichiro Hirano, Hiroki Miyamachi, Hiroshi Yakiwara, Takuto Maeda, Masahiro Shimazaki, Youichi Asano
EARTH PLANETS AND SPACE, 71, SPRINGEROPEN, May 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal, The Hokkaido Eastern Iburi earthquake (M-JMA=6.7) occurred on September 6, 2018, in the Hokkaido corner region where the Kurile and northeastern Japan island arcs meet. We relocated aftershocks of this intraplate earthquake immediately after the main shock by using data from a permanent local seismic network and found that aftershock depths were concentrated from 20 to 40km, which is extraordinarily deep compared with other shallow intraplate earthquakes in the inland area of Honshu and Kyushu, Japan. Further, we found that the aftershock area consists of three segments. The first segment is located in the northern part of the aftershock area, the second segment lies in the southern part, and the third segment forms a stepover between the other two segments. The hypocenter of the main shock, from which the rupture initiated, is located on the stepover segment. The centroid moment tensor solution for the main shock indicates a reverse faulting, whereas the focal mechanism solution determined by using the first-motion polarity of the P wave indicates strike-slip faulting. To explain this discrepancy qualitatively, we present a model in which the rupture started as a small strike-slip fault in the stepover segment of the aftershock area, followed by two large reverse faulting ruptures in the northern and southern segments.

Spatiotemporal crustal strain distribution around the Ishikari-Teichi-Toen fault zone estimated from Global Navigation Satellite System data
Ohzono M, H. Takahashi, C. Ito
Earth Planets Space, Apr. 2019, [Peer-reviewed]
English, Scientific journal

iGrav型超伝導重力計(#017)の道東カルデラ火山地域への移設 : 苫小牧から札幌・南新川を経て弟子屈へ（電子付録2）
名和 一成, 池田 博, 岡田 和見, 高橋 浩晃, 岡 大輔
北海道大学地球物理学研究報告, 82, 1, 北海道大学大学院理学研究院, 19 Mar. 2019
Japanese

iGrav型超伝導重力計(#017)の道東カルデラ火山地域への移設 : 苫小牧から札幌・南新川を経て弟子屈へ（電子付録1）
名和 一成, 池田 博, 岡田 和見, 高橋 浩晃, 岡 大輔
北海道大学地球物理学研究報告, 82, 1, 北海道大学大学院理学研究院, 19 Mar. 2019
Japanese

Moving the iGrav superconducting gravimeter (#017) : from Tomakomai to Teshikaga via Minami-shinkawa (Sapporo) in Hokkaido, Japan
NAWA Kazunari, IKEDA Hiroshi, OKADA Kazumi, TAKAHASHI Hiroaki, OKA Daisuke
北海道大学地球物理学研究報告, 82, 19, 24, 北海道大学大学院理学研究院, 19 Mar. 2019
Japanese, In November, 2018, continuous observation with the iGrav type superconducting gravimeter (#017) was started at the Teshikaga Observatory of the Hokkaido University in order to carry out high spatiotemporal resolution gravity monitoring in the volcanic area in eastern Hokkaido. The gravimeter used in a CCS project of Tomakomai site, was temporarily relocated to the Minami-shinkawa Observatory in September of the same year. And then it moved to the Teshikaga Observatory from Minami-shinkawa in November, just before entering the snowy season. In this paper, we report on the process of relocation and the data obtained during the process.

The 2018 Hokkaido Eastern Iburi Earthquake and its Aftermath
Hiroaki Takahashi, Reo Kimura
Journal of Disaster Research, 14, Jan. 2019, [Peer-reviewed], [Invited], [Lead author], [International Magazine]
English, Scientific journal

Implications of seismic velocity structure at the junction of Kuril-northeastern Japan arcs on active shallow seismicity and deep low-frequency earthquakes
Siina T, H. Takahashi, T. Okada, T. Matsuzawa
J. Geophys. Res., 123, 10, 8732, 8747, American Geophysical Union (AGU), Sep. 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal

Present-day Strain Accumulation in the Liupan Shan Area, Northeastern Margin of the Tibetan Plateau by GPS Observations　　　　　　　　　　　　　　　
Guojie meng, Xiaoning Su, Wanzhen Xu, Chieh-Hung Chen, Kai-Chien Cheng, Strong Wen, Ta-Kang Yeh, Peng Li, Mako Ohzono, Hiroaki Takahashi
TAO, Terrestrial, Atmospheric and Oceanic Sciences, Sep. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal

The Mw = 5.8 14 August 2016 middle Sakhalin earthquake on a boundary between Okhotsk and Eurasian (Amurian) plates
A. V. Konovalov, A. A. Stepnov, D. A. Safonov, A. I. Kozhurin, A. S. Pavlov, A. V. Gavrilov, K. A. Manaychev, D. Ye. Tomilev, H. Takahashi, M. Ichiyanagi
Journal of Seismology, 22, 4, 943, 955, Springer Netherlands, 01 Jul. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, An earthquake with the moment magnitude Mw = 5.8 occurred in the middle part of the Sakhalin Island, Russian Federation, on 14 August 2016, at 11:17 a.m. UTC. The earthquake source was located west of the Central Sakhalin Fault Zone, which is considered to mark the boundary between the Okhotsk and Eurasian (Amurian) plates. Moment tensor solution of the mainshock as well as the configuration of aftershock cloud suggests that the earthquake was caused by slip on a SW-dipping reverse fault. For the first time for Sakhalin, we have got the felt reports unified in accordance with DYFI. We also analyzed observed PGA values and, based on them, produced shaking maps.

Statistical Estimation of the Seismicity Level Change around Hokkaido, Northern Japan
Petr Voropaev, Hiroaki Takahashi, Vadim Saltykov
Pure and Applied Geophysics, 175, 6, 1971, 1982, Birkhauser Verlag AG, 01 Jun. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, The temporal seismicity change in two seismically active zones around Hokkaido, northern Japan was investigated using the statistical estimate of the seismicity level (SESL’09) procedure. Hypocenter data provided by the Japan Meteorological Agency from 1960 to 2013 were analyzed. The seismicity of two geographically different zones, formed by Pacific Plate subduction and Amurian Plate convergence, showed different statistical characteristics. Low cross-correlation values between the two zones also suggest independent seismic processes for each area. However, an anomalously high cross-correlation period was identified from 1996 to 2000, with a time lag of 8 weeks. A 6-month seismic quiescence period before the strongest Hokkaido Toho-Oki Earthquake (4 October 1994, Mj 8.2) was observed on the Pacific side.

Magma Accumulation estimated by GNSS continuous observation in Kirishima
Nakao S., Morita Y., Yakiwara H., Hirano S., Takahashi H., Ohta Y., Matsushima T., Iguchi M.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2018, 11, 11, The Volcanological Society of Japan, 2018
Japanese

Seismic velocity structure in the source region of the 2016 Kumamoto earthquake sequence, Japan
Azusa Shito, Satoshi Matsumoto, Hiroshi Shimizu, Takahiro Ohkura, Hiroaki Takahashi, Shinichi Sakai, Tomomi Okada, Hiroki Miyamachi, Masahiro Kosuga, Yuta Maeda, Masayuki Yoshimi, Youichi Asano, Makoto Okubo
GEOPHYSICAL RESEARCH LETTERS, 44, 15, 7766, 7772, AMER GEOPHYSICAL UNION, Aug. 2017, [Peer-reviewed]
English, Scientific journal, We investigate seismic wave velocity structure and spatial distribution of the seismicity in the source region of the 2016 Kumamoto earthquake sequence. A one-dimensional mean velocity shows that the seismogenic zone has a high-velocity and low-Vp/Vs ratio relative to the average velocity structure of Kyushu Island. This indicates that the crust is relatively strong, capable of sustaining sufficiently high strain energy to facilitate two large (M-j > 6.5) earthquakes in close proximity to one another in rapid succession. Three-dimensional tomography of the seismogenic zone around the source of the 2016 Kumamoto earthquake sequence yields Vp = 6 km/s and Vs = 3.5 km/s. Most large-displacement areas (asperities) of the M-j 7.3 event overlap with the seismogenic zone and the overlying surface layer. Aftershock seismicity is distributed deeper than the conventional seismogenic zone, which suggests decreased strength due to fluids or increased stress, both caused by coseismic slip.

Seismic activity associated with the 2016 Minamikayabe earthquake （MJMA5.3）in southern Hokkaido, Japan
一柳 昌義, 高田 真秀, 高橋 浩晃
北海道大学地球物理学研究報告, 80, 1, 11, 北海道大学大学院理学研究院, 19 Mar. 2017
Japanese, A M5.3 shallow earthquake occurred on 16 June 2016 in Minamikayabe region, southern Hokkaido. Three temporal seismic stations had been operated in the focal region from 18 June 2016 to 29 August 2016. Initial hypocenters and 1-D P-wave velocity structure were estimated from waveform data of temporal and permanent seismic stations. Fine aftershock distribution inferred from the double-difference procedure showed that the hypocenters were distributed in NW-SE direction, which might be agree with a fault plane of mainshock focal mechanism. Five foreshocks occurred near mainshock hypocenter showed similar waveform with high correlation. Characteristic persistent background seismicity and latest middle size earthquake might be related to high geothermal gradient in this region.

Gravity changes observed around the 62-II crater, Tokachi-dake volcano by precise gravity survey
Okazaki N., Takahashi R., Takahashi H., Ohzono M., Ichiyanagi M., Yamaguchi T., Okada K., Honda R., Takagi A.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2017, 0, 158, 158, The Volcanological Society of Japan, 2017
Japanese

道東・屈斜路湖で実施した高精度音響地層調査から判明した湖底地形・堆積構造　　　　　　　　　　　　　　　
内田康人, 岡崎紀俊, 山崎新太郎, 高橋浩晃
北海道地質研究所報告, 89, 1, 11, 2017

Hypocenter migration and crustal seismic velocity distribution observed for the inland earthquake swarms induced by the 2011 Tohoku-Oki earthquake in NE Japan: Implications for crustal fluid distribution and crustal permeability
Tomomi Okada, Toru Matsuzawa, Norihito Umino, Keisuke Yoshida, Akira Hasegawa, Hiroaki Takahashi, Takuji Yamada, Masahiro Kosuga, Tetsuya Takeda, Aitaro Kato, Toshihiro Igarashi, Kazushige Obara, Shinichi Sakai, Atsushi Saiga, Takashi Iidaka, Takaya Iwasaki, Naoshi Hirata, Noriko Tsumura, Yoshiko Yamanaka, Toshiko Terakawa, Haruhisa Nakamichi, Takashi Okuda, Shinichiro Horikawa, Hiroshi Katao, Tsutomu Miura, Atsuki Kubo, Takeshi Matsushima, Kazuhiko Goto, Hiroki Miyamachi
Crustal Permeability, 307, 323, wiley, 31 Oct. 2016
English, In book, After the occurrence of the 2011 magnitude 9 Tohoku earthquake, seismicity in the overriding plate changed. This chapter considers some possible evidence of the influence of crustal fluid/water on the occurrence of the triggered seismicity after the 2011 Tohoku-Oki earthquake. It estimates the permeability from the observed hypocenter diffusion. Shallow seismic activity and crustal deformation are strongly affected by the water dehydrated and upwelling from the subducting Pacific plate. Spatiotemporal expansion of hypocenter areas of some earthquake swarms can be attributed to fluid diffusion. In the upper crust, the earthquakes seem to be distributed in seismic high-velocity areas rather than in seismic low-velocity areas. In the lower crust, the seismic low-velocity areas appear to be elongated along N-S or NE-SW, the strike of the island arc. The chapter also estimates three-dimensional seismic velocity structure using the double-difference tomography method.

2016年熊本地震と関連する活動に関する総合調査
清水洋, 松本聡, 酒井慎一, 岡田知己, 渡辺俊樹, 飯尾能久, 相澤広記, 松島健, 高橋浩晃, 中尾茂, 鈴木康弘, 後藤秀昭, 大倉敬宏, 山本希, 中道治久, 山中浩明, 神野達雄, 三宅弘恵, 纐纈一起, 浅野公之, 松島信一, 福岡浩, 若井明彦, 大井昌弘, 田村圭子, 木村玲欧, 井ノ口宗成, 前原喜彦, 赤星朋比古
自然災害科学総合シンポジウム要旨集, 53, 53, 73, 90, 京都大学防災研究所自然災害研究協議会, 22 Sep. 2016
Japanese, Symposium, 平成28年9月22日(木)-23日(金), 於 : 静岡県地震防災センター2016年熊本地震に関して, 地震・地殻変動観測や変動地形学的調査に加え, 強震動, 土砂災害, 災害情報, 災害過程, 災害医療などの総合的調査を実施した。熊本地震は, 布田川・日奈久断層帯の右横ずれ運動によって発生したが, 走向・傾斜などの断層形状が異なる複数の断層面が活動したと考えられる。被害の大きさと余震の加速度振幅の空間分布には強い相関が認められた。地すべりについては, せん断時に発生する過剰間隙水圧が発生要因の一つであることを明らかにした。熊本地震災害は, 都市型災害と中山間地域の災害が同時に発生した広域複合災害であることを示し, エコノミークラス症候群などの災害医療も含め, それらの教訓と対策を考察した。

A new insight into the nature of seasonal variations in coordinate time series of GPS sites located near active faults
Sergey V. Trofimenko, Victor G. Bykov, Nikolay V. Shestakov, Nikolay N. Grib, Hiroaki Takahashi
FRONTIERS OF EARTH SCIENCE, 10, 3, 560, 569, SPRINGER, Sep. 2016, [Peer-reviewed]
English, Scientific journal, This study provides new insights into the nature of seasonal variations in coordinate time series of GPS sites located near active faults and methods of their modeling. Monthly averaged coordinate time series were analyzed for several pairs of collocated GPS sites situated near the active fault intersection area, in close proximity to the central part of the northern boundary of the Amurian plate and the vicinity of the San Andreas Fault zone. It is concluded that the observed seasonal variations are best described by a breather function which is one of the solutions of the well-known sine-Gordon equation. The obtained results suggest that, in this case, the source of seasonal variations may be caused by the appearance of solitary strain waves in the fault intersection system, which may be qualitatively treated as standing waves of compression-extension of the geological medium. Based on statistical testing, the limits of applicability of the suggested model have been established.

Aftershock activity of the 2015 Gorkha, Nepal, earthquake determined using the Kathmandu strong motion seismographic array
Masayoshi Ichiyanagi, Nobuo Takai, Michiko Shigefuji, Subeg Bijukchhen, Tsutomu Sasatani, Sudhir Rajaure, Megh Raj Dhital, Hiroaki Takahashi
EARTH PLANETS AND SPACE, 68, 25, SPRINGER HEIDELBERG, Feb. 2016, [Peer-reviewed]
English, Scientific journal, The characteristics of aftershock activity of the 2015 Gorkha, Nepal, earthquake (Mw 7.8) were evaluated. The mainshock and aftershocks were recorded continuously by the international Kathmandu strong motion seismographic array operated by Hokkaido University and Tribhuvan University. Full waveform data without saturation for all events enabled us to clarify aftershock locations and decay characteristics. The aftershock distribution was determined using the estimated local velocity structure. The hypocenter distribution in the Kathmandu metropolitan region was well determined and indicated earthquakes located shallower than 12 km depth, suggesting that aftershocks occurred at depths shallower than the Himalayan main thrust fault. Although numerical investigation suggested less resolution for the depth component, the regional aftershock epicentral distribution of the entire focal region clearly indicated earthquakes concentrated in the eastern margin of the major slip region of the mainshock. The calculated modified Omori law's p value of 1.35 suggests rapid aftershock decay and a possible high temperature structure in the aftershock region.

Deep, low-frequency earthquakes and its relationship to volcanic activity
H. Takahashi, J. Miyamura, T. Shi'ina
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2016, 44, 44, The Volcanological Society of Japan, 2016
Japanese

2015年に発生した阿寒湖付近の地震（MJMA5.0），北海道大学地球物理学研究　　　　　　　　　　　　　　　
一柳昌義, 高橋浩晃, 山口照寛, 岡田和見, 大園眞子, 岡崎紀俊
北海道大学地球物理学研究, 69, 1, 8, 2016
Japanese, Research institution

十勝岳白銀荘での重力鉛直勾配測定，北海道大学地球物理学研究報告
高橋浩晃, 一柳昌義, 岡崎紀俊, 高木朗充, 宮城洋介, 本多亮
北海道大学地球物理学研究報告, 79, 79, 9, 13, 2016
Japanese, Research institution

Vertical crustal movement of the south of Primorsky Krai and their relationship with the subduction zone geodynamic processes　　　　　　　　　　　　　　　
Gerasimenko M. D, N. V. Shestakov, A. G. Koromuets, G. N. Gerasimov, H. Takahashi, D. V. Svisoev, G. V. Nechaev
Geodesy and Cartography, 33, 37, 2016, [Peer-reviewed]
English, Scientific journal

Behavior of a GEONET Pillar Associated with a Shallow Earthquake in Eastern Hokkaido on June 4, 2015
Ohzono Mako, Takahashi Hiroaki
Journal of the Geodetic Society of Japan, 62, 1, 21, 28, The Geodetic Society of Japan, 2016, [Peer-reviewed]
Japanese, Scientific journal,

Behavior and instability of a GEONET pillar under strong seismic ground motion was evaluated. Coseismic displacement at the 0513 GEONET site due to a M5.0 local earthquake with 5- intensity showed four times larger value than predicted one from theoretical estimation. Inclination of the pillar due to strong seismic ground shaking was a candidate of the tilt change because little tilt change was expected from earthquake faulting. Corrected coseismic displacement was well consistent with that from theoretical value, and suggested unstable behavior of this pillar by strong ground shaking. High correlation between temperature and coordinate fluctuations for three years data also might request correlation of pillar movement for GNSS coordinate time series using tiltmeter data.

Ionospheric disturbances in the vicinity of the Chelyabinsk meteoroid explosive disruption as inferred from dense GPS observations
N. P. Perevalova, N. V. Shestakov, S. V. Voeykov, H. Takahashi, M. Guojie
GEOPHYSICAL RESEARCH LETTERS, 42, 16, 6535, 6543, AMER GEOPHYSICAL UNION, Aug. 2015, [Peer-reviewed]
English, Scientific journal, The paper describes results of studying effects of total electron content (TEC) variations triggered by the Chelyabinsk meteoroid airburst as inferred from unique data of a dense GPS network located around the final part of the meteoroid atmospheric path. Well-pronounced TEC disturbances with an average period of about 10 min and amplitude of 0.07-0.5 TECU (total electron content unit, 1 TECU = 10(16) elm(-2)) were detected. These disturbances were initiated by an ionospheric source activated about 5-6min after the airburst. The disturbance velocity damping with time and distance from the airburst was revealed using a GPS interferometric technique. Several modes of TEC disturbances with propagation velocities ranging from 250 to 660 m/s were distinguished through the distance-time diagram analysis. The estimated position of ionospheric source of TEC disturbances is shifted 36 km southwestward from the airburst, which is most likely to be associated with the conjoint influence of TEC data errors, damping and anisotropy of TID propagation velocity.

Hypocenter migration and crustal seismic velocity distribution observed for the inland earthquake swarms induced by the 2011 Tohoku-Oki earthquake in NE Japan: implications for crustal fluid distribution and crustal permeability
T. Okada, T. Matsuzawa, N. Umino, K. Yoshida, A. Hasegawa, H. Takahashi, T. Yamada, M. Kosuga, T. Takeda, A. Kato, T. Igarashi, K. Obara, S. Sakai, A. Saiga, T. Iidaka, T. Iwasaki, N. Hirata, N. Tsumura, Y. Yamanaka, T. Terakawa, H. Nakamichi, T. Okuda, S. Horikawa, H. Katao, T. Miura, A. Kubo, T. Matsushima, K. Goto, H. Miyamachi
GEOFLUIDS, 15, 1-2, 293, 309, WILEY-BLACKWELL, Feb. 2015, [Peer-reviewed]
English, Scientific journal, After the occurrence of the 2011 magnitude 9 Tohoku earthquake, the seismicity in the overriding plate changed. The seismicity appears to form distinct belts. From the spatiotemporal distribution of hypocenters, we can quantify the evolution of seismicity after the 2011 Tohoku earthquake. In some earthquake swarms near Sendai (Nagamachi-Rifu fault), Moriyoshi-zan volcano, Senya fault, and the Yamagata-Fukushima border (Aizu-Kitakata area, west of Azuma volcano), we can observe temporal expansion of the focal area. This temporal expansion is attributed to fluid diffusion. Observed diffusivity would correspond to the permeability of about 10(-15) (m(2)). We can detect the area from which fluid migrates as a seismic low-velocity area. In the lower crust, we found seismic low-velocity areas, which appear to be elongated along N-S or NE-SW, the strike of the island arc. These seismic low-velocity areas are located not only beneath the volcanic front but also beneath the fore-arc region. Seismic activity in the upper crust tends to be high above these low-velocity areas in the lower crust. Most of the shallow earthquakes after the 2011 Tohoku earthquake are located above the seismic low-velocity areas. We thus suggest fluid pressure changes are responsible for the belts of seismicity.

P41 Seismic Activity of Akan-Teshikaga region, Eastern Hokkaido
ICHIYANAGI Masayoshi, TAKAHASHI Hiroaki, YAMAGUCHI Teruhiro, OKADA Kazumi, TAKADA Masamitsu, OHZONO Mako, OKAZAKI Noritoshi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2015, 139, 139, The Volcanological Society of Japan, 2015
Japanese

P52 Strain field around Kussharo Caldera, eastern Hokkaido, measured by dense GPS observation network
Ohzono Mako, Takahashi Hiroaki, Ichiyanagi Masayoshi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2015, 150, 150, The Volcanological Society of Japan, 2015
Japanese

B1-19 Gravity changes observed at Tokachidake volcano, Hokkaido in 2010-2015
Okazaki N., Takahashi R., Oka D., Takahashi H., Ichiyanagi M., Yamaguchi T., Honda R., Miyagi Y., Takagi A.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2015, 65, 65, The Volcanological Society of Japan, 2015
Japanese

B1-21 Volcanic Deformation in Tokachi-dake Detected by DInSAR Observations, and its Deformation Sources
Miyagi Yousuke, Kawaguchi Ryohei, Ozawa Taku, Takahashi Hiroaki
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2015, 67, 67, The Volcanological Society of Japan, 2015
Japanese

A3-09 Ultra-very-long-period signals observed by high-sampling tiltmeters
Takahashi H., Yamaguchi T., Nakao S., Yakiwara H., Hirano S., Goto K., Matsushima Takeshi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2015, 37, 37, The Volcanological Society of Japan, 2015
Japanese

B1-20 Evaluation of the Ground Deformation around the 62-2 crater, Tokachi volcano, using by FEM
TAKAGI Akimichi, OKAZAKI Noritoshi, TAMURA Makoto, TAKAHASHI Hiroaki, MICHISHITA Takeshi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2015, 66, 66, The Volcanological Society of Japan, 2015
Japanese

有限要素法による十勝岳62-II火口周辺の局所的地殻変動の予備解析　　　　　　　　　　　　　　　
奥山哲, 高橋浩晃
北海道大学地球物理学研究報告, 68, 11, 18, 2015
Japanese, Research institution

The 2012 Earthquake Swarm in Nakagawa town, northern Hokkaido
一柳昌義, 高橋浩晃, 山口照寛, 東龍介, 山田卓司, 大園真子, 眞城亮成, 笠原稔, 谷岡勇市郎
北海道大学地球物理学研究報告, 68, 78, 37, 51, 北海道大学大学院理学研究院, 2015
Japanese, Research institution, An earthquake swarm begun at 15 July 2012 in Nakagawa town of northern Hokkaido. The largest earthquake with MJMA4.3 occurred on 16 July 2012. We carried out temporal seismic observation with seven stations from 18 July 2012 to the last October 2012. Hypocenters were calculated using the Double-Difference hypocenter determination procedure with a local one dimensional P-wave velocity structure. Precise hypocenter data indicated that epicenters were distributed in very narrow area of 2 km×2 km with shallow depth from 4 km to 7 km. Earthquakes after middle of August occurred only in southern part of the region and depth had got shallower with time. Hypocenters indicated no clear alignment in consistent with any nodal planes of major earthquakes. An independent hypocenter cluster with shallower than 2 km was observed above the main activity area. A slow slip event (SSE) with Mw 5.4 coincidentally detected by GNSS crustal deformation data during the swarm. This swarm was situated at the southeastern end of the fault of SSE. This fact suggested that seismic swarm might triggered SSE or was induced by SSE.

An intraplate slow earthquake observed by a dense GPS network in Hokkaido, northernmost Japan
Mako Ohzono, Hiroaki Takahashi, Masayoshi Ichiyanagi
GEOPHYSICAL JOURNAL INTERNATIONAL, 200, 1, 144, 148, OXFORD UNIV PRESS, Jan. 2015, [Peer-reviewed]
English, Scientific journal, An intraplate slow earthquake was detected in northernmost Hokkaido, Japan, by a dense network of the global navigation satellite system. Transient abnormal acceleration of <12 mm was observed during the period 2012 July to 2013 January (similar to 5.5 months) at several sites. The spatial displacement distribution suggests that a localized tectonic event caused localized deformation. Estimated fault parameter indicates very shallow-dip reverse faulting in the uppermost crust, with a total seismic moment of 1.75E + 17 N m (M-w 5.4). This fault geometry is probably consistent with detachment structure indicated by geological studies. A simultaneous earthquake swarm with the maximum magnitude M4.1 suggests a possibility that the slow slip triggered the seismic activity for unknown reasons. This slow earthquake is slower than its moment would indicate, with a duration-magnitude scaling relationship unlike either regular earthquakes or subduction slow slip events. This result indicates that even if the area is under different physical property from subduction zones, slow earthquake can occur by some causes. Slow earthquakes exist in remote regions away from subduction zones and might play an important role in strain release and tectonic activity.

Proposal for robust monitoring of catastrophic tsunami using onshore strain and tilt geodetic sensors
Takahashi H
J. Disaster Res., 10, 59, 770, 776, Fuji Technology Press, 2015, [Peer-reviewed]
English, Scientific journal

Modeling of coseismic crustal movements initiated by the May 24, 2013, M (w)=8.3 Okhotsk deep focus earthquake
N. V. Shestakov, M. Ohzono, H. Takahashi, M. D. Gerasimenko, V. G. Bykov, E. I. Gordeev, V. N. Chebrov, N. N. Titkov, S. S. Serovetnikov, N. F. Vasilenko, A. S. Prytkov, A. A. Sorokin, M. A. Serov, M. N. Kondratyev, V. V. Pupatenko
DOKLADY EARTH SCIENCES, 457, 2, 976, 981, MAIK NAUKA/INTERPERIODICA/SPRINGER, Aug. 2014, [Peer-reviewed]
English, Scientific journal, The Okhotsk deep focus earthquake (M (w) = 8.3), the largest in the history of instrumental seismology, occurred on May 24, 2013, at 05:45 UTC in the Sea of Okhotsk near the western coast of the Kamchatka Peninsula. For the first time we have succeeded in catching the field of horizontal and vertical coseismic offsets generated by a strong deep seismic event, and investigating its characteristics using continuous GPS measurements. Based on these data and taking into account the seismological information, we have developed a dislocation model of the Okhotsk deep focus earthquake.

Pore pressure distribution in the focal region of the 2008 M7.2 Iwate-Miyagi Nairiku earthquake
Keisuke Yoshida, Akira Hasegawa, Tomomi Okada, Hiroaki Takahashi, Masahiro Kosuga, Takaya Iwasaki, Yoshiko Yamanaka, Hiroshi Katao, Yoshihisa Iio, Atsuki Kubo, Takeshi Matsushima, Hiroki Miyamachi, Youichi Asano
EARTH PLANETS AND SPACE, 66, 66, 59, SPRINGER HEIDELBERG, Jun. 2014, [Peer-reviewed]
English, Scientific journal, The pore fluid pressure distribution in the focal region of the 2008 Iwate-Miyagi Nairiku earthquake was investigated through an analysis of the diversity of focal mechanisms. We inverted stress orientations and focal mechanisms directly from P-wave polarity data obtained from a dense aftershock observation network and other temporarily and routinely operated stations. The estimated stress orientation is consistent with that typical of NE Japan. Specifically, the sigma 1 axis is oriented WNW-ESE nearly parallel to plate convergence, and the sigma 3 axis is nearly vertical, consistent with a reverse-faulting stress regime, with some exceptions in the central part of the aftershock area. We obtained 2,497 well-determined focal mechanisms whose average number of P-wave polarity data is more than 70. The spatial distribution of pore fluid pressure was estimated by using the obtained orientations of the principal stresses and earthquake faults. The pore pressure ratio for each earthquake fault was calculated under the assumption that reduced frictional strength was caused by pore fluid pressure. The results showed that the diversity of the focal mechanisms here obtained requires high pore fluid pressures at many of the earthquake faults in the focal region. The spatial pattern of pore pressure ratio shows that areas of higher pore pressure ratio are distributed around the large coseismic slip area near Kurikoma volcano. Immediately beneath these high pore pressure areas, there exists a distinct seismic low-velocity zone that continues down to the mantle wedge below. These observations suggest that crustal fluids supplied from the mantle wedge have contributed to producing high pore pressures and to lowering the frictional strengths of those faults. Crustal fluids may also have contributed to generating the mainshock rupture.

Calibration of SCINTREX CG5 Gravimeter S/N130141025(No.2)A connection measurement between the SappporoGS and the TsukubaFGS
高橋 浩晃, 山口 照寛
北海道大学地球物理学研究報告, 77, 25, 29, 北海道大学大学院理学研究院, Mar. 2014
Japanese, Gravimetric connection between SapporoGS and TsukubaFGS via ChitoseGS and HanedaGS with SCINTREX CG5 gravimeter S/N130141025 was carried out for instrument calibration. Observed relative gravity between SapporoGS and TsukubaFGS was 526mGal, which was the same as that of value determined by Geospatial Information Authority of Japan in order of 10-4. This measurement suggested that scale constant of this gravimeter is valid for below 500mGal difference with correction coefficient of 1.0002.

SCINTREX CG5相対重力計S/S30141025の検定（その２）　　　　　　　　　　　　　　　
高橋浩晃, 山口照寛
北海道大学地球物理学研究報告, 77, 25, 30, 2014
Japanese, Research institution

Calibration of SCINTREX CG5 Gravimeter S/N130141025(No.1)Gravity Measurements for Calibration in Hokkaido
高橋浩晃, 重藤迪子, 山口照寛, 岡崎紀俊
北海道大学地球物理学研究報告, 77, 77, 15, 24, 北海道大学大学院理学研究院, 2014
Japanese, Research institution, Relative gravity measurements with SCINTREX CG5 gravimeter S/N130141025 for instrument calibration were carried out at fundamental, first order gravity benchmarks, and triangulation point in Hokkaido. Observed relative gravity value between ObihiroFGS and ShintotsukawaFGS by CG5 was 76 mGal, which is same as that of value determined by Geospatial Information Authority of Japan in the order of 10-4. Estimated correction coefficient was 1.00020. Simultaneous measurement by three gravimeters at Teine triangulation point showed 231 mGal relative gravity value from MinamiShinkawa benchmark within 0.120 mGal difference between instruments. This suggested that estimation of correction coefficients for several hundreds to a thousand mGal difference should be conducted for precise calibration. Drift rate fluctuation shown in continuous measurement data also should be evaluated in future.

The 2012 Earthquake Swarm in Nigorikawa Caldera, Hokkaido
一柳昌義, 笠原稔, 高橋浩晃, 岡崎紀俊, 高橋良, 大園真子
北海道大学地球物理学研究報告, 77, 77, 5, 14, 北海道大学大学院理学研究院, 2014
Japanese, Research institution, An earthquake swarm begun at the end of January, 2012 and the activity reached a peak in middle February, then gradually decreased by the end of April, in the Nigorikawa caldera, Hokkaido. The largest earthquake was the MJMA3.6 event which occurred on 15 February 2012 with maximum intensity 3．Temporal seismic observation with two stations carried out from 20 February to 9 April in the caldera. Detailed hypocenter distribution estimated by using both data temporal and secular observations shows two clusters, one of them is aligned along the northern caldera wall and another is located at eastern outside of caldera. Strike of alignment epicenter of the north cluster shows NE-SW direction, which is in good agreement with one of the nodal plane of focal mechanism of the largest event.

Microtremor Observation at an Explosion Crater on northwestern mountainside of Shiretoko-Iozan Volcano, eastern Hokkaido
高橋浩晃, 一柳昌義
北海道大学地球物理学研究報告, 77, 77, 1, 4, 北海道大学大学院理学研究院, 2014
Japanese, Research institution, Microtremor observation was carried out in an active explosion crater of Shiretoko-Iozan volcano. Velocity seismograms indicated amplitude of microtremor was to be around 10-6m/s. Comparison with the 1981 observation showed no significant change of microtremor amplitude. This result suggested that activity status of this crater had been stable. Microtremor amplitude at the mountain base showed one fifth of that in the crater. This fact implied that microtremor is due to geothermal activity in the crater.

Spatial Relationship between Interseismic Seismicity, Coseismic Asperities and Aftershock Activity in the Southwestern Kuril Islands
Hiroaki Takahashi, Minoru Kasahara
Volcanism and Subduction: The Kamchatka Region, 153, 164, American Geophysical Union, 19 Mar. 2013, [Peer-reviewed]
English, In book, We investigate the spatiotemporal relationship between background seismic activity, coseismic asperities and aftershock activity in the southwestern Kuril Islands using high precision earthquake catalogue produced by Hokkaido University since 1976. Seismicity maps clearly indicate that coseismic asperity patches correspond to low seismic activity regions surrounded by high activity areas. This seismicity pattern in and around the asperity does not vary with time, which may suggest invariant stable frictional conditions in the temporal domain. We infer that these observations reflect the frictional nature of the asperity and its surrounding area. This spatial variation of seismic activity may be due to the variations of the yielding threshold point to the shear stress for earthquake faulting, which is due to the spatial variation of frictional parameters on the plate interface. It is feasible to recognize unknown asperities from epicenter distributions during the interseismic period. A similar relationship between asperity distribution and aftershock activity might also be due to the frictional variations on the plate interface.

Preliminary Study on Magnetic Structure and Geothermal Activity of Tyatya Volcano, Southwestern Kuril Islands
Noritoshi Okazaki, Hiroaki Takahashi, Kenji Nogami, Hiromitsu Oshima, Hiromu Okada, Minoru Kasahara
Volcanism and Subduction: The Kamchatka Region, 365, 369, American Geophysical Union, 19 Mar. 2013, [Peer-reviewed]
English, In book, We carried out reconnaissance surveys of the magnetic and geothermal fields on Tyatya volcano, Kunashiri Island, southwestern Kuril Islands. Two characteristic features were in the magnetic anomalies: topography dependent ones and locally scattered ones of which origin was unknown. Modeling of the topography dependent anomalies indicates that the Tyatya edifice is uniformly magnetized with magnetization of 7 A/m and any significant anomalies, that suggest the existence of thermally demagnetized parts, are not found. The result agrees with low heat discharge rate of 0.6 Mw from volcano surface. Judging from these ground-based data, it can be concluded that the volcanic activity of the shallower part of Tyatya volcano is very inactive at present.

ロシア極東地域における広帯域地震観測
一柳昌義, 高橋浩晃, 高田真秀, 山口照寛, 笠原稔, 宮町宏樹, 平野舟一郎, 前田宜浩, ワレンチン ミハイロフ
東京大学地震研究所技術研究報告, 18, 59, 60, 31 Jan. 2013
Japanese

Seismic activity associated with the 2010 M4.6 Sapporo Earthquake in central Ishikari region, Hokkaido　　　　　　　　　　　　　　　
Masayoshi Ichiyanagi, Teruhiro Yamaguchi, Masamitsu Takada, Ryosuke Azuma, Kazunori Kuroi, Takuji Yamada, Hiroaki Takahashi, Takahiro Maeda
Journal of the Hokkaido University, Faculty of Science, Series VII: Geophysics, 76, 1, 13, 2013
Japanese, Scientific journal, On December 2, 2010, MJMA4.6 shallow felt earthquake occurred beneath southeastern part of Sapporo city. Three temporal seismic stations were installed near epicentral area. Reliable hypocenter data estimated by double difference procedure with local seismic velocity structure indicated clear southeastern-dipping distribution. Fault plane from focal mechanism estimated from P-wave polarization well agreed with this hypocenter distribution. Geometry of hypocenter distribution was also well consistent with an anticline structure and possible buried active fault estimated for earthquake disaster damage assumption by local government. Recalculation of hypocenters of the 1985, 1990, and 2010 felt earthquakes under equal condition implied that epicentral locations of these three events were approximately same. These facts implied possible stress concentration in epicentral region.

Seismic Activity Associated with the 2010 M4.6 Sapporo Earthquake in central Ishikari region, Hokkaido
一柳昌義, 山口照寛, 高田真秀, 東龍介, 黒井和典, 山田卓司, 高橋浩晃, 前田宜浩
北海道大学地球物理学研究報告, 76, 76, 1, 13, 2013
Japanese, Research institution

Imaging the source regions of normal faulting sequences induced by the 2011 M9.0 Tohoku-Oki earthquake
Aitaro Kato, Toshihiro Igarashi, Kazushige Obara, Shinichi Sakai, Tetsuya Takeda, Atsushi Saiga, Takashi Iidaka, Takaya Iwasaki, Naoshi Hirata, Kazuhiko Goto, Hiroki Miyamachi, Takeshi Matsushima, Atsuki Kubo, Hiroshi Katao, Yoshiko Yamanaka, Toshiko Terakawa, Haruhisa Nakamichi, Takashi Okuda, Shinichiro Horikawa, Noriko Tsumura, Norihito Umino, Tomomi Okada, Masahiro Kosuga, Hiroaki Takahashi, Takuji Yamada
GEOPHYSICAL RESEARCH LETTERS, 40, 2, 273, 278, AMER GEOPHYSICAL UNION, Jan. 2013, [Peer-reviewed]
English, Scientific journal, Intense swarm-like seismicity associated with shallow normal faulting was induced in Ibaraki and Fukushima prefectures, Japan, following the 2011 Tohoku-Oki earthquake. This seismicity shows a systematic spatiotemporal evolution, but little is known of the heterogeneity in crustal structure in this region, or its influence on the evolution of the seismicity. Here, we elucidate a high-resolution model of crustal structure in this region and determine precise hypocenter locations. Hypocenters in Ibaraki Prefecture reveal a planar earthquake alignment dipping SW at similar to 45 degrees, whereas those in Fukushima Prefecture show a more complex distribution, consisting of conjugate sets of aligned small earthquakes. On the north of the hypocenter of the largest earthquake in the sequence (the M7.0 Iwaki earthquake), we imaged a high-velocity body at shallow depths that lacks aftershock seismicity. Based on fault source models, the large-slip region of the Iwaki earthquake is situated along a zone that roughly coincides with this high-velocity body. We delineated a separate low-velocity anomaly directly beneath the hypocenter of the Iwaki earthquake, indicating crustal fluids in this region. We hypothesize that strong crust underwent structural failure due to the infiltration of crustal fluids into the seismogenic zone from deeper levels, causing the Iwaki earthquake. Citation: Kato, A., et al. (2013), Imaging the source regions of normal faulting sequences induced by the 2011 M9.0 Tohoku-Oki, Geophys. Res. Lett., 40, 273-278, doi: 10.1002/grl.50104.

Volume change of the magma reservoir relating to the 2011 Kirishima Shinmoe-dake eruption-Charging, discharging and recharging process inferred from GPS measurements
Shigeru Nakao, Yuichi Morita, Hiroshi Yakiwara, Jun Oikawa, Hideki Ueda, Hiroaki Takahashi, Yusaku Ohta, Takeshi Matsushima, Masato Iguchi
EARTH PLANETS AND SPACE, 65, 6, 505, 515, TERRA SCIENTIFIC PUBL CO, 2013, [Peer-reviewed]
English, Scientific journal, Using GPS data, we evaluate the volume change of the magma reservoir associated with the eruption of Kirishima Shinmoe-dake volcano, southern Kyushu, Japan, in 2011. Because ground deformation around Shinmoe-dake volcano is strongly affected not only by regional tectonic movement but also by inflation of Sakurajima volcano located approximately 30-40 km to the southwest, we first eliminate these unwanted contributions from the observed data to extract the signals from Shinmoe-dake volcano. Then, we estimate the source locations and volume change before, during, and after the highest eruptive activity occurring between January 26 and 31. Our model shows that the magma began to accumulate about one year prior to the sub-Plinian eruption, with approximately 65% of the accumulated magma being discharged during the peak of the eruptive activity, and that magma accumulation continued until the end of November 2011. An error analysis shows that the sources during the three periods indicated above are located in almost the same position: 5 km to the northwest of the summit at a depth of 8 km. The 95% confidence interval of the estimated source depth is from 7.5 to 13.7 km.

Moderate Repeating Earthquakes off Kushiro, Eastern Hokkaido, Japan
SAKOI HISAYUKI, SAKOI HISAYUKI, MATSUYAMA TERUO, HIRAYAMA TATSUYA, YAMAZAKI ICHIRO, YAMAMOTO TAKEYASU, YAMAMOTO TAKEYASU, ICHIYANAGI MASAYOSHI, TAKAHASHI HIROAKI
地震, 65, 2, 151, 161, 日本地震学会, 15 Dec. 2012
Japanese

Volcanic strain change prior to an earthquake swarm observed by groundwater level sensors in Meakan-dake, Hokkaido, Japan
Hiroaki Takahashi, Tomo Shibata, Teruhiro Yamaguchi, Ryuji Ikeda, Noritoshi Okazaki, Fujio Akita
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, 215, 1, 7, ELSEVIER SCIENCE BV, Feb. 2012, [Peer-reviewed]
English, Scientific journal, We installed and operated a low-cost groundwater level observation system at intermittent hot spring wells in order to monitor volcanic strain signals from the active Meakan-dake volcano in eastern Hokkaido, Japan. Data are sampled at 1 Hz and are transmitted to the data center in real time. Evaluation of the water level time series with theoretical predictive tidal strain and coseismic static strain changes has suggested that the wells penetrate to the artesian aquifer and act as a volumetric strain sensor. An active earthquake swarm with more than 400 events occurred at the shallower part of the volcano from January 9 to 11, 2008. Three independent wells recorded pre- to co-swarm groundwater drops simultaneously, which represented a decrease in volumetric strain. The total volumetric strain change during the three active days was estimated to be from 6 to 7 x 10(-7). The observed data, including changes in volumetric strain, absence of deformation in the GPS coordinates, and activation of deep low-frequency earthquakes, might imply possible deflation of a source deeper than 10 km, and these preceding deeper activities might induce an earthquake swarm in a shallower part of the Meakan-dake volcano. (C) 2011 Elsevier B.V. All rights reserved.

Analysis of the far-field crustal displacements caused by the 2011 Great Tohoku earthquake inferred from continuous GPS observations
Nikolay V. Shestakov, Hiroaki Takahashi, Mako Ohzono, Alexander S. Prytkov, Victor G. Bykov, Mikhail D. Gerasimenko, Margarita N. Luneva, Grigory N. Gerasimov, Andrey G. Kolomiets, Vladimir A. Bormotov, Nikolay F. Vasilenko, Jeongho Baek, Pil-Ho Park, Mikhail A. Serov
TECTONOPHYSICS, 524, 76, 86, ELSEVIER SCIENCE BV, Feb. 2012, [Peer-reviewed]
English, Scientific journal, Small coseismic offsets detectable using GPS techniques were found more than 2300 km away from the Great Tohoku 2011 earthquake epicenter. Area of the most intense far-field co- and postseismic deformations with the maximum offset values exceeding 40 and 18 mm, respectively, extends westward from Honshu Island to the Korean Peninsula, northeastern China and southern Far East Russia. Sakhalin Island does not exhibit notable displacements caused by the earthquake, in contrast to the adjacent territories. A rectangular fault model with uniform slip was developed based on the GPS-detected far-field coseismic displacements using the spherically layered Earth assumption. Both far- and near-field coseismic deformations are generally well described by a single-segment rupture of 200 x 96 km(2), characterized by thrust slip with minor strike-slip component of about 33 m and by the seismic moment value of 1.9.10(22)N.m (Mw=8.8), which roughly constrains the major slip area. The resultant compact fault geometry revealed that the main portion of the seismic moment had been realized in a relatively small-sized rupture segment The sensitivity of far-field GPS data to the major slip area might also be used in the development of a seismically generated giant tsunami warning system. (C) 2011 Elsevier B.V. All rights reserved.

北海道における地震津波防災に対する取組と今後の課題　　　　　　　　　　　　　　　
高橋浩晃, 定池祐季, 谷岡勇市郎
日本地震学会モノグラフ, 1, 81, 85, 2012
Japanese, Scientific journal

地殻変動データベースシステムについて
山口照寛, 高橋浩晃, 岡山宗夫, 高田真秀, 一柳昌義, 笠原稔
東京大学地震研究所技術研究報告, 17, 137, 139, 東京大学地震研究所, 25 Dec. 2011
Japanese

2010年12月2日石狩地方中部の地震(Mj4.6)の震源近傍域におけるアンケート震度調査
重藤迪子, 高井伸雄, 高橋浩晃, 一柳昌義, 岡島秀樹, 澤田耕助, 宮原有史
日本地震工学会大会梗概集, 8th, 260, 261, Nov. 2011
Japanese

Anomalous depth dependency of the stress field in the 2007 Noto Hanto, Japan, earthquake: Potential involvement of a deep fluid reservoir
Aitaro Kato, Shinichi Sakai, Takashi Iidaka, Takaya Iwasaki, Eiji Kurashimo, Toshihiro Igarashi, Naoshi Hirata, Toshihiko Kanazawa, Kei Katsumata, Hiroaki Takahashi, Ryo Honda, Takahiro Maeda, Masayoshi Ichiyanagi, Teruhiro Yamaguchi, Masahiro Kosuga, Tomomi Okada, Junichi Nakajima, Shuichiro Hori, Takashi Nakayama, Akira Hasegawa, Toshio Kono, Syuichi Suzuki, Noriko Tsumura, Yoshihiro Hiramatsu, Katsunori Sugaya, Aiko Hayashi, Tetsuya Hirose, Akihiro Sawada, Keisuke Tanaka, Yoshiko Yamanaka, Haruhisa Nakamichi, Takashi Okuda, Yoshihisa Iio, Kin'ya Nishigami, Masatoshi Miyazawa, Hiroo Wada, Norio Hirano, Hiroshi Katao, Shiro Ohmi, Kiyoshi Ito, Issei Doi, Shunta Noda, Satoshi Matsumoto, Takeshi Matsushima, Atsushi Saiga, Hiroki Miyamachi, Kazutoshi Imanishi, Tetsuya Takeda, Youichi Asano, Yohei Yukutake, Tomotake Ueno, Takuto Maeda, Takanori Matsuzawa, Shutaro Sekine, Makoto Matsubara, Kazushige Obara
GEOPHYSICAL RESEARCH LETTERS, 38, L06306, AMER GEOPHYSICAL UNION, Mar. 2011
English, Scientific journal, We have elucidated depth variations in the stress field associated with the 2007 Noto Hanto, Japan, earthquake by stress tensor inversion using high-quality aftershock data obtained by a dense seismic network. Aftershocks that occurred above 4 km in depth indicated a strike-slip stress regime. By contrast, aftershocks in deeper parts indicated a thrust faulting stress regime. This depth variation in the stress regime correlates well with that in the slip direction derived from a finite source model using geodetic data. Furthermore, the maximum principal stress (sigma(1)) axis was stably oriented approximately W20 degrees N down to the depth of the mainshock hypocenter, largely in agreement with the regional stress field, but, below that depth, the s1 axis had no definite orientation, indicating horizontally isotropic stress. One likely cause of these drastic changes in the stress regime with depth is the buoyant force of a fluid reservoir localized beneath the seismogenic zone. Citation: Kato, A., et al. (2011), Anomalous depth dependency of the stress field in the 2007 Noto Hanto, Japan, earthquake: Potential involvement of a deep fluid reservoir, Geophys. Res. Lett., 38, L06306, doi:10.1029/2010GL046413.

Static strain and stress changes in eastern Japan due to the 2011 off the Pacific coast of Tohoku Earthquake, as derived from GPS data
Hiroaki Takahashi
EARTH PLANETS AND SPACE, 63, 7, 741, 744, TERRA SCIENTIFIC PUBL CO, 2011, [Peer-reviewed]
English, Scientific journal, The 2011 M 9.0 Tohoku earthquake induced regional crustal deformation not only in the Japanese Islands but also in north-eastern Asia. Strain release due to mainshock faulting should cause strain redistribution in the overriding plates. The dense GPS network in Japan enables us to calculate co-seismic strain and stress changes from observed data. Strain is a more objective indicator than displacement because no reference frame is required. The co-seismic strain field clearly indicates island-scale strain redistribution. Huge extensional strain changes were concentrated in the southern Iwate and northern Miyagi regions, with a maximum value of 45 x 10(-6), which might correspond to approximately 225 to 450 years of strain accumulation. This implies relatively large strain accumulation and release in these regions. Small strain decay was observed in the northernmost Niigata-Kobe tectonic zone and a possible anomalous Coulomb failure stress change was observed in the Mt. Fuji region. Earthquakes triggered in the above regions might be associated with these anomalies, and/or these non-uniform crustal deformations may reflect crustal heterogeneity.

地殻変動データベースシステムについて (平成22年度 技術業務報告)
山口 照寛, 高橋 浩晃, 岡山 宗夫
東京大学地震研究所技術研究報告, 0, 17, 137, 139, 東京大学地震研究所, 2011
Japanese

A3-07 Deflation and deep low-frequency earthquakes prior to a shallow earthquake swarm in Meakan-dake volcano, Hokkaido
Takahashi H., Yamaguchi T., Shibata T., Okazaki N., Miyamura J.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2011, 50, 50, The Volcanological Society of Japan, 2011
Japanese

A2-05 Crustal deformation before and after eruption on Jan. 26, 2011 in Kirishima Shinmoedake, Japan
Nakao S., Morita Y., Goto K., Yakiwara H., Hirano S., Oikawa J., Ueda H., Kozono T., Hirata Y., Takahashi H., Ichiyanagi M., Ohta Y., Matsushima T., Iguchi M.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2011, 27, 27, The Volcanological Society of Japan, 2011
Japanese

A2-20 Gravity change with crustal deformation observed at Tokachi-dake volcano, Hokkaido
Okazaki N., Hirose W., Takahashi R, Takahashi H., Ichiyanagi M., Honda R.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2011, 42, 42, The Volcanological Society of Japan, 2011
Japanese

Aftershock Activities of the Nevelsk Earthquake on August 2, 2007 (M_6.4) off Southwest Sakhalin Island, Russia by Japan-Russia Joint Observation
ICHIYANAGI Masayoshi, TAKAHASHI Hiroaki, MAEDA Takahiro, KASAHARA Minoru, MIYAMACHI Hiroki, HIRANO Shuichiro, SEN Rak Se, VALENTIN Mikhaylov, KIM Chun Ung
Zisin : Journal of the Seismological Society of Japan, 62, 4, 139, 152, 日本地震学会, 15 Mar. 2010
Japanese

Linear poroelasticity of groundwater levels from observational records at wells in Hokkaido, Japan
Tomo Shibata, Norio Matsumoto, Fujio Akita, Noritoshi Okazaki, Hiroaki Takahashi, Ryuji Ikeda
TECTONOPHYSICS, 483, 3-4, 305, 309, ELSEVIER SCIENCE BV, Mar. 2010
English, Scientific journal, The natural fluctuation of groundwater level depends not only on the stress applied to an aquifer but also on the type of rock that comprises it. Poroelastic parameters, such as strain sensitivity, loading efficiency, and poroelastic bulk moduli, are used to analyze the hydrologic attributes of aquifers. In this study, we use records of groundwater levels from 19 wells to calculate coefficients of poroelastic characteristics. The records allow a Comprehensive description of how groundwater levels vary with fluctuations of volumetric strain in the crust's interior. We estimate strain sensitivities in two ways: (a) using the wells' response to tidal strain and (b) using coseismic changes in groundwater level based on historical data. The strain sensitivities estimated by the two different methods have good linear correlation. We also estimate loading efficiency using observational records and calculate bulk moduli from the loading efficiencies and Strain sensitivities. The bulk moduli obtained in this manner are roughly consistent with laboratory Values. (C) 2009 Elsevier B.V. All rights reserved.

Development of Crustal Deformation Database System
YAMAGUCHI Teruhiro, KASAHARA Minoru, TAKAHASHI Hiroaki, OKAYAMA Muneo, TAKADA Masamitsu, ICHIYANAGI Masayoshi
Journal of the Geodetic Society of Japan, 56, 2, 47, 57, The Geodetic Society of Japan, 2010
Japanese, We have developed an easy-to-use Crustal Deformation Database (CDD) for strain, tilt and other long-term geophysical data. WWW-based user interface is employed for operations and the servers are connected to internet. Anyone who has internet connections and web browser, therefore, are easily possible to refer and download data from anywhere. We have adopted the WIN format (de facto standard format for the seismic data exchange in Japan) for data acquisition and management, because it can treat any sampling interval data without re-sampling procedure during data processing.
This database has following functions; 1) data drawing on the display for selected period from 1 second to 10 years, 2) data download for selected channels and period, and 3) several data analyses, i.e., filtering, tidal analysis by BAYTAP-G program, plane strain analysis and its linkage to seismic data.
Trial run of CDD is in operation from 2004 and 66 stations data operated by Hokkaido University, Tohoku University, University of Tokyo, Nagoya University, Kyushu University, Tono Research Institute of Earthquake Science, Geological Survey of Hokkaido and National Astronomical Observatory of Japan have been stored to CDD in real time and above functions are in use. We hope any institutions operating crustal deformation observation will join our CDD network to establish unified CDD of Japan.

Present tectonics of the southeast of Russia as seen from GPS observations
SHESTAKOV N. V.
Geophys. J. Int., doi: 10.1111/j.1365-246X.2010.04871.x, 2010

P13 Investigation of crustal deformation associated with the 2008 eruption on Hokkaido Meakandake Volcano detected by GPS and InSAR
Kohno Y., Ozawa T., Takahashi H., Nakao S., Okazaki N., Ichiyanagi M., Oikawa T.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2010, 105, 105, The Volcanological Society of Japan, 2010
Japanese

公設試験研究機関のアウトリーチ活動－ 札幌市立平岸小学校での事例　　　　　　　　　　　　　　　
鈴木隆広, 岡崎紀俊, 柴田智郎, 垣原康之, 廣瀬 亘, 野呂田晋, 高橋 良, 川上源太郎, 石丸 聡, 田村 慎, 村山泰司, 荻野 激, 髙清水康博, 一柳昌義, 高橋浩晃, 河野裕希, 佐藤達也
北海道立地質研究所報告, 81, 103, 110, 2010
Japanese, Research institution

High resolution Q-1 estimation based on extension of coda normalization method and its application to P-wave attenuation structure in the aftershock area of the 2005 West Off Fukuoka Prefecture Earthquake (M7.0)
S. Matsumoto, K. Uehira, A. Watanabe, K. Goto, Y. Iio, N. Hirata, T. Okada, H. Takahashi, H. Shimizu, M. Shinohara, T. Kanazawa
GEOPHYSICAL JOURNAL INTERNATIONAL, 179, 2, 1039, 1054, WILEY-BLACKWELL PUBLISHING, INC, Nov. 2009, [Peer-reviewed]
English, Scientific journal, P>We developed a method for estimating the seismic-wave attenuation (1/Q) in a seismically active region such as an aftershock area. To estimate the attenuation factor between two adjacent hypocentres, we employed two seismograms recorded at a station and calculate the ratio between two power spectra of direct waves normalized by those in the coda for both the events. The coda normalization of the spectrum and the ratio between the two events minimize the possible influences of sources, sites, instruments and attenuation from the station to the hypocentral area. The 1/Q value can be estimated from the variation of the ratios of event pairs calculated at many stations for various traveltime differences between the even pairs. This method involves double-difference (DD) estimation from the logarithmic power spectra for estimating the 1/Q structure, employing a concept similar to the recently developed 'DD tomography' for velocity structures. We applied this method to the aftershock area of the 2005 West Off Fukuoka Prefecture Earthquake (M7.0) in order to investigate the 1/Q structure of P waves. By using the spectra of the seismograms of 1781 events recorded at a dense seismic network deployed around the aftershock area, we obtained the spatial variation of the 1/Q value in this region. The 1/Q distribution thereby obtained suggests that there exists a high-attenuation region around the edge of the main shock fault, which could correspond to the segment boundary between the earthquake fault and the adjacent faults. In addition, we found that the initiation points of the main shock and aftershocks were located in a low-attenuation region.

Coseismic Deformations of the Earth's Surface in Sakhalin Related to the August 2, 2007, M-w=6.2 Nevelsk Earthquake
N. F. Vasilenko, A. S. Prytkov, Ch. U. Kim, H. Takahashi
RUSSIAN JOURNAL OF PACIFIC GEOLOGY, 3, 5, 424, 428, MAIK NAUKA/INTERPERIODICA/SPRINGER, Oct. 2009
English, Scientific journal, The satellite radiointerferometry data revealed deformations of the coastal part of Sakhalin Island caused by the earthquake with M-w = 6.2 that occurred in the Tatar Strait near Nevelsk. Based on the joint analysis of the satellite and seismological data, dislocation models were contrived for the main shock and its strong aftershocks with the western dip of the fault planes. This made it possible to determine the source mechanisms and the geometrical parameters of the seismic ruptures and to calculate the coseismic vertical and horizontal displacements. In contrast to the one-dimensional model of the insular land displacements determined from the satellite radiointerferometry measurements, this provided a three-dimensional model of the surface deformations for the epicentral zone.

Aseismic slow slip on an inland active fault triggered by a nearby shallow event, the 2008 Iwate-Miyagi Nairiku earthquake (Mw6.8)
T. Iinuma, M. Ohzono, Y. Ohta, S. Miura, M. Kasahara, H. Takahashi, T. Sagiya, T. Matsushima, S. Nakao, S. Ueki, K. Tachibana, T. Sato, H. Tsushima, K. Takatsuka, T. Yamaguchi, M. Ichiyanagi, M. Takada, K. Ozawa, M. Fukuda, Y. Asahi, M. Nakamoto, Y. Yamashita, N. Umino
GEOPHYSICAL RESEARCH LETTERS, 36, doi:10.1029/2009GL040063, AMER GEOPHYSICAL UNION, Oct. 2009
English, Scientific journal, Using GPS observations, we have detected an aseismic slip event on the intraplate Dedana Fault that was triggered by the Iwate-Miyagi Nairiku earthquake (Mw6.8, 13 Jun 2008 UTC) on a nearby but separate fault. The observations cannot be satisfactorily explained in terms of either viscoelastic relaxation or poroelastic rebound, and we cannot explain the observed displacement time series without presuming that aseismic slip occurred on the Dedana Fault. This slip was likely triggered by the mainshock stress change. The detection of future such aseismic slip events on intraplate faults is likely to require denser geodetic networks than are currently in operation, but is important for fully characterizing the seismic hazard associated with intraplate earthquakes. Citation: Iinuma, T., et al. (2009), Aseismic slow slip on an inland active fault triggered by a nearby shallow event, the 2008 Iwate-Miyagi Nairiku earthquake (Mw6.8), Geophys. Res. Lett., 36, L20308, doi:10.1029/2009GL040063.

2008年11月に噴火した雌阿寒岳の調査報告
石丸聡, 田村慎, 廣瀬亘, 村山泰司, 岡崎紀俊, 柴田智郎, 中川光弘, 吉本充宏, 長谷川健, 上澤真平, 西本潤平, 小杉安由美, 松本亜希子, 馬場彰, 佐々木寿, 高橋浩晃, 一柳昌義, 山口照寛, 河野裕希, 本多亮, 笠原稔
北海道立地質研究所報告, 80, 80, 115, 126, 31 Mar. 2009
Japanese, Research institution

Characteristics of great earthquakes occurring in the central Kuril Islands
高橋浩晃, 前田宜浩, 笠原稔
Geophysical bulletin of Hokkaido University, 72, 72, 399, 410, Mar. 2009
Japanese, Research institution

Crustal deformation associated with the small eruption on March 2006 of Meakandake volcano detected by continuous and repeated GPS observation
岡崎 紀俊, 高橋 浩晃, 笠原 稔
Geophysical bulletin of Hokkaido University, 0, 72, 191, 201, 北海道大学大学院理学研究院自然史科学部門（地球物理学） = Department of Natural History Sciences (Geophysics), Graduate School of Science, Hokkaido University, Mar. 2009
Japanese, Continuous and temporary dense GPS network in Meakandake volcano, eastern Hokkaido, operated by Geological Survey of Hokkaido, Japan Meteorological Agency and Hokkaido University, detected co-eruptive crustal deformation due to the 2006 small phreatic eruption. Although no deformation was observed at stations in foot of volcano edifice, large horizontal displacements with ̃5cm were observed at stations in the northern part of Ponmachineshiri summit crater. We estimated crustal deformation models from ten stations data and obtained following findings; (1) stations in the northern part of sum...

Seismic activity of the 2004 Syari-dake earthquake swarm by dense temporary seismic observation network in the eastern part of Hokkaido, Japan
一柳昌義, 高橋浩晃, 山口照寛, 高田真秀, 岡山宗夫, 笠原稔
Geophysical bulletin of Hokkaido University, 72, 72, 299, 314, 北海道大学大学院理学研究院自然史科学部門（地球物理学） = Department of Natural History Sciences (Geophysics), Graduate School of Science, Hokkaido University, 2009
Japanese, Research institution, From April 27, 2004, Mt. Syari-dake earthquake swarm occurred in the eastern part of Hokkaido, Japan. The activity began at 4:19 on April 27, 2004. We installed nine temporary seismic stations around the seismic active area immediately after its occurrence and had continued the observation for about seven months. We determined 2228 hypocenters of earthquakes. It is found that the seismic active area is clearly distributed on the plane having southwest-northeast strike with dip angle of about 80 degrees. This plane well agrees with one of the nodal planes of the focal mechanisms of several earthquakes determined by P-wave first motions. Hypocenters migrate northeastward at a rate of 96 m/day and westward at a rate of 51 m/day. We also investigated hypocenter distribution before the installing of the temporary seismic stations. To improve accuracy of hypocenter determination we applied travel time correction for every permanent seismic stations. Relocated precise hypocenters demonstrate that the main seismic activity started to expand eastward just after the begining of the swarm.

Deep low-frequency earthquakes occurring in Japanese Islands
高橋浩晃, 宮村淳一
Geophysical bulletin of Hokkaido University, 72, 72, 177, 190, 北海道大学大学院理学研究院自然史科学部門（地球物理学） = Department of Natural History Sciences (Geophysics), Graduate School of Science, Hokkaido University, 2009
Japanese, Research institution, We investigate the activity of deep low-frequency earthquakes (DLE) in Japanese Islands by JMA hypocenter catalogue during 1997 to 2008. It is confirmed that DLE cluster is distributed in every region. This implies that DLE phenomenon is common in Japanese subduction zone. Many active DLE clusters are identified in and around the quaternary volcanoes in whole area. There are also many non-volcanic clusters in Hokkaido and Tohoku regions, but very few in Kanto, Koushinetsu, Chubu, Hokuriku and Kyushu regions. High activity of non-volcanic clusters is observed in Kinki region. No clear correlation between DLE number and volcano activity index during 100 and 10,000 years is recognized. This fact implies the possibility that DLE activity is not precursor signal of shallow volcanic activities such as eruption at any time. Lower limit of DLE hypocenter depth generally coincides with depth of Moho discontinuity of each region. This may indicates that structure of upper mantle and lower crust and its boundary strongly control the occurrence of DLE's.

Construction of the broadband seismic network in Far Eastern Russia for imaging the stagnant slab
宮町宏樹, 一柳昌義, 前田宜浩, 山口照寛, 高田真秀, 高橋浩晃, 笠原稔, 平野舟一郎, SEN Rak Se, VALENTIN Mikhaylov, MIKRUKOBA Oksana, LEVIN Yury, KIM Chun Ung, VASILENKO Nikolay, SHESTAKOV Nikolay, GERASIMEKO Mikhail, VLADIMIR Bormotov, LUNEVA Margarita, LARISA Gunbina
北海道大学地球物理学研究報告, 72, 72, 37, 2009
Japanese, Research institution

High resolution Q−1 estimation based on extension of coda normalization method and its application to P-wave attenuation structure in the aftershock area of the 2005West Off Fukuoka Prefecture Earthquake (M7.0)　　　　　　　　　　　　　　　
Geophys. J. Int, doi: 10.1111/j.1365-246X.2009.04313.x, 2009

P01 Deep Low-Frequency earthquakes occurring in Japanese Islands
Takahashi H., Miyamura J.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2009, 101, 101, The Volcanological Society of Japan, 2009
Japanese

Dislocation Model of the August 2, 2007, M-w 6.2 Nevelsk Earthquake
N. F. Vasilenko, B. W. Levin, A. S. Prytkov, Ch. U. Kim, H. Takahashi
DOKLADY EARTH SCIENCES, 422, 1, 1145, 1149, MAIK NAUKA/INTERPERIODICA/SPRINGER, Oct. 2008
English, Scientific journal

Postseismic displacements following the 2007 Noto peninsula earthquake detected by dense GPS observation
Manabu Hashimoto, Hiroaki Takahashi, Ryosuke Doke, Minoru Kasahara, Akira Takeuchi, Kenusuke Onoue, Yoshinobu Hoso, Yo Fukushima, Kajuro Nakamura, Fumio Ohya, Ryo Honda, Masayoshi Ichiyanagi, Teruhiro Yamaguchi, Takahiro Maeda, Yoshihiro Hiramatsu
Earth, Planets and Space, 60, 2, 139, 144, Springer Nature, Feb. 2008, [Peer-reviewed]
English, Scientific journal

Magnetic and geothermal survey on Tyatya volcano in Kunashir Island southwestern Kuril Islands
岡崎 紀俊, 高橋 浩晃, 野上 健治
Report of the geological survey of Hokkaido, 79, 79, 35, 41, 北海道立地質研究所, 2008
Japanese

Source parameters of the 2007 Noto Hanto earthquake sequence derived from strong motion records at temporary and permanent stations
Takahiro Maeda, Masayoshi Ichiyanagi, Hiroaki Takahashi, Ryo Hondo, Teruhiro Yamaguchi, Minoru Kasahara, Tsutomu Sasatani
EARTH PLANETS AND SPACE, 60, 10, 1011, 1016, TERRA SCIENTIFIC PUBL CO, 2008, [Peer-reviewed]
English, Scientific journal, A large crustal earthquake, the 2007 Nolo Hanto earthquake, occurred west off the Noto peninsula in Ishikawa prefecture. Japan, oil March 25, 2007. We started temporary strong motion observation Lit live sites within the aftershock area from about 13 h after the main shock occurrence. We first applied file spectral inversion method to S-wave strong ground motion records at the temporary and permanent stations. We obtained source specta of the main shock and aftershocks, Q(s) (quality factor for S-wave) values (Q(s) = 34.5f(0.95)) and site responses at 22 sites. We then estimated a source model of the main shock using the empirical Green's function method. The source model Consists Of three strong motion generation areas and well explains the observed records. Finally, we examined the consistency of the main-shock SOLH-CC models estimated from the above two analyses. The high-frequency level of the acceleration source spectrum based on the main-shock source model is consistent With the source spectrum estimated from the spectral inversion. The combined area of strong motion generation areas is approximately half of the value expected by the empirical relationship, and the high-frequency level of acceleration source spectrum is approximately 2.5 times larger than the empirical relationship for shallow inland and inter-plate earthquakes.

Real-time eruption magnitude estimation from far-field geodetic data : A proposal for volcano early warning
TAKAHASHI H.
J. Disaster Res., 3, 252, 260, 2008, [Peer-reviewed]
English, Scientific journal

Postseismic slip associated with the 2007 Chuetsu-oki, Niigata, Japan, Earthquake (M 6.8 on 16 July 2007) as inferred from GPS data
Iinuma, T., Ohta, Y., Miura, S., Tachibana, K., Matsushima, T., Takahashi, H., Sagiya, T., Ito, T., Miyazaki, S., Doke, R., Takeuchi, A., Miyao, K., Hirao, A., Maeda, T., Yamaguchi, T., Takada, M., Iwakuni, M., Ochi, T., Meilano, I., Hasegawa, A.
Earth, Planets and Space, 60, 11, 1087, 2008, [Peer-reviewed]
English, Scientific journal

Coseismic and postseismic deformation related to the 2007 Chuetsu-oki, Niigata Earthquake
Yusaku Ohta, Satoshi Miura, Takeshi Iinuma, Kenji Tachibana, Takeshi Matsushima, Hiroaki Takahashi, Takeshi Sagiya, Takeo Ito, Shin'ichi Miyazaki, Ryosuke Doke, Akira Takeuchi, Kayo Miyao, Akihiko Hirao, Takahiro Maeda, Teruhiro Yamaguchi, Masamitsu Takada, Makiko Iwakuni, Tadafumi Ochi, Irwan Meilano, Akira Hasegawa
EARTH PLANETS AND SPACE, 60, 11, 1081, 1086, TERRA SCIENTIFIC PUBL CO, 2008
English, Scientific journal, An intermediate-strength earthquake of magnitude M(j) 6.8 occurred on July 16, 2007, centered beneath the Japan Sea a few kilometers offshore of Niigata Prefecture in central Japan. We constructed a dense GPS network to investigate postseismic deformation after this event, choosing our GPS sites carefully so as to complement the nationwide GPS GEONET array. Coseismic displacements caused by the mainshock detected at some GEONET sites were used to estimate coseismic fault parameters. The results indicate that the geodetic data can be explained by a combination of two rectangular faults dipping northwest and southeast. Minor but definite postseismic deformation was detected largely in the southern part of the dense network. The time series of site coordinates can be characterized by a logarithmic decay function, and the estimated time constant seems to be almost similar in range to that of the 2004 Mid-Niigata Prefecture Earthquake. We also found a possible site instability at 960566 (Izurno-zaki, GEONET) caused by a small, local landslide associated with the mainshock and therefore concluded that the data obtained at this site should not be used for coseismic or postseismic analysis.

1874年北海道初山別の地震に関する補足的資料:斜面崩壊を中心に
田近淳, 田村慎, 川上源太郎, 高橋浩晃, 濱田誠一, 志村一夫
北海道立地質研究所報告, 78, 175, 182, 北海道立地質研究所, 30 Mar. 2007
Japanese

Mudflow and its deposits occurred by the eruption on March 2006 at Meakandake volcano, Hokkaido, northern Japan
HIROSE WATARU, OKAZAKI NORITOSHI, ISHIMARU SATOSHI, TAJIKA JUN, TAKAHASHI HIROAKI
北海道立地質研究所報告, 78, 57, 81, 北海道立地質研究所, 30 Mar. 2007
Japanese

えりも地殻変動観測所での歪地震動波形による1978年宮城県沖地震(M7.4)と2005年宮城県沖の地震(M7.2)の比較
高橋浩晃, 山口照寛, 岡山宗夫, 笠原稔
地震, 59, 4, 381, 384, SEISMOLOGICAL SOCIETY OF JAPAN, 25 Mar. 2007
Japanese

Aftershock Distribution of the December 14, 2004 Rumoi-nanbu Earthquake (M 6.1) in the Northern Part of Hokkaido, Japan
ICHIYANAGI MASAYOSHI, MAEDA TAKAHIRO, YAMAGUCHI TERUHIRO, TAKAHASHI HIROAKI, KASAHARA MINORU, SASATANI TSUTOMU, YAMAMOTO AKIHIKO
地震, 59, 3, 209, 221, 15 Mar. 2007
Japanese

2005年福岡県西方沖地震 福岡県西方沖地震の余効変動観測
中尾茂, 高橋浩晃, 一柳昌義, 松島健, 河野裕希
月刊地球, 29, 2, 128, 132, 海洋出版, 01 Feb. 2007
Japanese

2005年福岡県西方沖地震 福岡県西方沖地震の精密震源分布と発震機構
植平賢司, 山田知朗, 篠原雅尚, 中東和夫, 宮町宏樹, 飯尾能久, 岡田知己, 高橋浩晃, 松尾のり道, 内田和也, 金沢敏彦, 清水洋
月刊地球, 29, 2, 91, 97, 01 Feb. 2007
Japanese

2006年3月21日に小噴火した雌阿寒岳の観測報告
北海道立地質研究所報告, 78, 83, 2007

1874年北海道初山別の地震に関する補足的資料：斜面崩壊を中心に　　　　　　　　　　　　　　　
北海道立地質研究所報告, 78, 175, 2007

2006年（平成18年）3月の雌阿寒岳噴火で発生した泥流とその堆積物　　　　　　　　　　　　　　　
北海道立地質研究所報告, 78, 57, 2007

Coseismic and postseismic deformation related to the 2007 Niigataken Chuetsu-Oki Earthquake, Earth Planets Space　　　　　　　　　　　　　　　
Earth Planets Space, 60, 1081, 2007

Geodetic constraint on the slip distribution of the 2006 Central Kuril earthquake
Hiroaki Takahashi, Minoru Kasahara
EARTH PLANETS AND SPACE, 59, 10, 1095, 1098, TERRA SCIENTIFIC PUBL CO, 2007
English, Scientific journal, We have investigated the slip distribution of the 15 November 2006 Central Kuril earthquake off Simushir Island using continuous GPS data. A dense GPS network on Hokkaido Island, northern Japan, and Sakhalin Island detected coseismic horizontal displacements of similar to 9 mm despite large epicentral distances of about 9001200 km. Eastward displacements at the sites decrease to the south, and this spatial distribution feature constrains the slip on the three subfaults. Our data suggest that little slip has occurred in the southern and northern parts, but that a 6-m slip has occurred in the center of the focal region. This interpretation fits well with the detailed slip distribution inferred from teleseismic waveform inversions. The total seismic moment, 2.8 x 10(21) N m, is approximately the value indicated using by the Global CMT solution. Our result implies that there remains a seismic gap between this event and the 1952 great Kamchatkan earthquake that is large enough for an M > 8 earthquake.

Spatial relations between interseismic seimicity, coseismic asperities and aftershock activity in the southwestern Kuril trench　　　　　　　　　　　　　　　
Volcanism and Subduction: The Kamchatka region, AGU monograph, 172, 153, 2007

Preliminary study on magnetic structure and geothermal activity of Tyatya volcano, Southwestern Kuril islands
Noritoshi Okazaki, Hiroaki Takahashi, Kenji Nogami, Hiromitsu Oshima, Hiromu Okada, Minoru Kasahara
Geophysical Monograph Series, 172, 365, 369, Blackwell Publishing Ltd, 2007
English, In book, We carried out reconnaissance surveys of the magnetic and geothermal fields on Tyatya volcano, Kunashiri Island, southwestern Kuril Islands. Two characteristic features were in the magnetic anomalies: topography dependent ones and locally scattered ones of which origin was unknown. Modeling of the topography dependent anomalies indicates that the Tyatya edifice is uniformly magnetized with magnetization of 7 A/m and any significant anomalies, that suggest the existence of thermally demagnetized parts, are not found. The result agrees with low heat discharge rate of 0.6 Mw from volcano surface. Judging from these ground-based data, it can be concluded that the volcanic activity of the shallower part of Tyatya volcano is very inactive at present.

2004 年12 月1４日に発生した留萌支庁南部の地震(MJMA6.1)の余震活動
一柳 昌義, 前田 宜浩, 山口 照寛, 高橋 浩晃, 笠原 稔, 笹谷 努, 山本 明彦
地震, 59, 3, 209, 221, 2007

Aftershock observation for the 2007 Noto Hanto Earthquake
Sakai Shinichi, Kato Aitaro, Kurashimo Eiji, Iidaka Takashi, Igarashi Toshihiro, Hirata Naoshi, Iwasaki Takaya, Kanazawa Toshihiko, Watanabe Shigeru, Haneda Toshio, Kobayashi Masaru, Miura Katsumi, Miura Reiko, Tagami Kiyoko, Ogino Izumi, Saka Mamoru, Watanabe Atshi, Miyakawa Koji, Katsumata Kei, Takahashi Hiroaki, Kasahara Minoru, Honda Ryo, Maeda Takahiro, Ichiyanagi Masayoshi, Yamaguchi Teruhiro, Kosuga Masahiro, Okada Tomomi, Nakajima Junichi, Hori Shuichiro, Nakayama Takashi, Nii Kyohei, Hasegawa Akira, Kono Toshio, Suzuki Shuichi, Tsumura Noriko, Kobayashi Risa, Nozaki Kenji, Hiramatsu Yoshihiro, Sugaya Katsunori, Hayashi Aiko, Hirose Tetsuya, Sawada Akihiro, Tanaka Keisuke, Yamanaka Yoshiko, Nnakamichi Haruhisa, Okuda Takashi, Iio Yoshihisa, Nishigami Kin'ya, Miyazawa Masatoshi, Wada Hiroo, Hirano Norio, Nakao Setsuo, Katao Hiroshi, Ohmi Shiro, Ito Kiyoshi, Shibutani Takuo, Kano Yasuyuki, Doi Issei, Noda Shunta, Katagi Takeshi, Nishitsuji Yohei, Matsumoto Satoshi, Matsushima Ken, Saiga Atsushi, Miyamachi Hiroki, Imanishi Kazutoshi, Kuwahara Yasuto, Cho Ikuo, Hoshino Makoto, Takeda Tetsuya, Asano Yoichi, Yukutake Yohei, Ueno Tomotake, Maeda Takuto, Matsuzawa Takanori, Sekine Syutaro, Matsubara Makoto, Obara Kazushige
Bulletin of the Earthquake Research Institute,University of Tokyo, 82, 3, 225, 233, The University of Tokyo, 2007
Japanese, Research institution, The 2007 Noto Hanto Earthquake occurred on March 25, 2007, in the Noto Peninsula, central Japan. A half day after the main shock, we started installing temporary seismic stations in order to determine the precise locations of its aftershocks. Ten universities and two research institutes deployed 89 temporary seismic stations in and around the source area. The observation lasted for about two months. We relocated 1318 aftershocks with arrival time corrections at each station. The relocated hypocenters show relatively small errors, less than 0.2km in the horizontal direction and less than 0.4km depth. Most of the relocated hypocenters are about 2.0km shallower than those determined by JMA. The precise aftershock distribution extends into a shallower area than the original, and it coincides with sea floor ward extension of the active faults previously known by a sonic reflection survey

Spatial relationship between interseismic seismicity, coseismic asperities and aftershock activity in the Southwestern Kuril islands
Hiroaki Takahashi, Minoru Kasahara
Geophysical Monograph Series, 172, 153, 164, Blackwell Publishing Ltd, 2007, [Peer-reviewed]
English, In book, We investigate the spatiotemporal relationship between background seismic activity, coseismic asperities and aftershock activity in the southwestern Kuril Islands using high precision earthquake catalogue produced by Hokkaido University since 1976. Seismicity maps clearly indicate that coseismic asperity patches correspond to low seismic activity regions surrounded by high activity areas. This seismicity pattern in and around the asperity does not vary with time, which may suggest invariant stable frictional conditions in the temporal domain. We infer that these observations reflect the frictional nature of the asperity and its surrounding area. This spatial variation of seismic activity may be due to the variations of the yielding threshold point to the shear stress for earthquake faulting, which is due to the spatial variation of frictional parameters on the plate interface. It is feasible to recognize unknown asperities from epicenter distributions during the interseismic period. A similar relationship between asperity distribution and aftershock activity might also be due to the frictional variations on the plate interface.

Seismological monitoring on the 2003 Tokachi-oki earthquake, derived from off Kushiro permanent cabled OBSs and land-based observations
Tomoki Watanabe, Hiroaki Takahashi, Masayoshi Ichiyanagi, Muneo Okayama, Masamitsu Takada, Riyo Otsuka, Kenji Hirata, Shigehiko Morita, Minoru Kasahara, Hitoshi Mikada
TECTONOPHYSICS, 426, 1-2, 107, 118, ELSEVIER SCIENCE BV, Oct. 2006
English, Scientific journal, Japan Marine Science and Technology Center installed a cabled geophysical observatory system off Kushiro, Hokkaido Island in July 1999. This observatory system comprises three ocean bottom seismographs (OBSs), two tsunami gauges, and a geophysical/geochemical monitoring system. 4 years and 2 months after the installation, a megathrust earthquake (the 2003 Tokachi-Oki earthquake, 26th September in Japan Standard Time (JST), M-JMA 8.0) occurred along a plate boundary underneath a forearc basin where the system is located. The system recorded clear unsaturated seismograms just at 28.6 km from the epicenter. This paper demonstrates advantages brought by the cabled observatory to record the megathrust earthquake showing how earthquake delectability is improved dramatically combining permanent OBS and land-based observations around the region, and importance of the in situ monitoring on the seismogenic zone. In the present study, processing OBSs and land-based network together, and comparing magnitudes of common observed earthquakes with national authorized network, event detection level improved down to M 1.5, which is much lower than the previously designed as down to M similar to 2. Comparing detection level before and after installing OBSs, we found dramatic improvement of the earthquake detection level in the interesting region. Real-time continuous observations of microearthquakes since 1999 have brought us tremendous findings. First, a seismic quiescence started about 10 days before the 2003 Tokachi-Oki earthquake. Second, aftershock distribution is not uniform over the focal area and can be divided into several sub-regions, which might indicate an existence of several asperities. We think that the geophysical observations helped to understand the initiation process of the rupture of the 2003 Tokachi-Oki earthquake and that observations including seismological, geodynamic, hydrogeological, and the other multidisciplinary observations would provide a clue to future understanding of seismogenic processes at subduction zones. (c) 2006 Elsevier B.V. All rights reserved.

Characteristics of a Tsunami Earthquake Occurring in Hokkaido -Revisting the Hokkaido-Toho-Oki Earthquake on June 10, 1975-
高橋 浩晃
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University, 69, 0, 207, 220, 北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, 15 Mar. 2006
Japanese, The 1975 Hokkiado-Oki earthquake (Ms7.0) was characterized as a tsunami earthquake which had anomalous long source process time and spectrum of seismic waves. Predominant period of seismic waves were situated in several tens to several hundreds seconds. This abnormal long-period seismic wave generated very weak intensity distribution compared to the seismic moment (Mo) and epicenter distance. Aftershock distribution and focal mechanismw indicated this event occurrde on very shallow plate boundary close to the trench axis, in where seismicity has been very low. If next tsunami earthquake w...

Precise aftershock distribution of the 2005 West Off Fukuoka Prefecture Earthquake (Mj=7.0) using a dense onshore and offshore seismic network
Kenji Uehira, Tomoaki Yamada, Masanao Shinohara, Kazuo Nakahigashi, Hiroki Miyamachi, Yoshihisa Iio, Tomomi Okada, Hiroaki Takahashi, Norimichi Matsuwo, Kazunari Uchida, Toshihiko Kanazawa, Hiroshi Shimizu
EARTH PLANETS AND SPACE, 58, 12, 1605, 1610, TERRA SCIENTIFIC PUBL CO, 2006
English, Scientific journal, The 2005 West Off Fukuoka Prefecture Earthquake (Mj=7.0) occurred on March 20, 2005 in the northern part of Kyushu, Japan. To study the aftershock activity, we deployed eleven pop-up type ocean bottom seismometers (OBSs), sixteen locally recorded temporary stations, and eight telemetered temporary stations in and around the epicenter region. We combined data from these stations and permanent stations located around the aftershock area, and determined the hypocenter of the mainshock and aftershocks. The mainshock was in the northwestern central part of the aftershock region, at a depth of 9.5 km. The mainshock was on a left-lateral strike-slip fault. Aftershocks were located in a depth range of 1-16 km and laterally extend for about 25 km in a NW-SE direction. We found that the aftershocks fell into four groups. This might be due to the heterogeneous structure in the source region. In the group that includes the mainshock, we estimated two fault planes bordering on the depth of the mainshock. There are 10-degree differences in both strike and dip angles between the lower and upper planes. From the aftershock distribution and the focal mechanisms, the rupture first propagated downward, and then propagated upward.

Postseismic deformation following the 2005 West Off Fukuoka Prefecture Earthquake (M7.0) derived by GPS observation
NAKAO Shigeru, TAKAHASHI Hiroaki, MATSUSHIMA Takeshi, KOHNO Yuhki, ICHIYANAGI Masayoshi
EPS, 58, 12, 1617, 1620, Terra Scientific Pub. Co., 2006
English

Aftershock seismicity and fault structure of the 2005 West Off Fukuoka Prefecture Earthquake (M(JMA)7.0) derived from urgent joint observations
Hiroshi Shimizu, Hiroaki Takahashi, Tomomi Okada, Toshihiko Kanazawa, Yoshihisa Iio, Hiroki Miyamachi, Takeshi Matsushima, Masayoshi Ichiyanagi, Naoki Uchida, Takaya Iwasaki, Hiroshi Katao, Kazuhiko Goto, Satoshi Matsumoto, Naoshi Hirata, Shigeru Nakao, Kenji Uehira, Masanao Shinohara, Hiroshi Yakiwara, Nobuki Kame, Taku Urabe, Norimichi Matsuwo, Tomoaki Yamada, Atsushi Watanabe, Kazuo Nakahigashi, Bogdan Enescu, Kazunari Uchida, Shin'ichi Hashimoto, Syuichiro Hirano, Takeo Yagi, Yuhki Kohno, Tomotake Ueno, Masaki Saito, Mio Hori
EARTH PLANETS AND SPACE, 58, 12, 1599, 1604, TERRA SCIENTIFIC PUBL CO, 2006
English, Scientific journal, On March 20, 2005, a large M(JMA)7.0 earthquake occurred in the offshore area, west of Fukuoka prefecture, northern Kyushu, Japan. A series of joint observations were carried out by teams from several universities in Japan with the aim of investigating the aftershock activity. Six online telemetered and 17 offline recording seismic stations were installed on land around the aftershock area immediately followed the occurrence of the mainshock. Because aftershocks were located mainly in offshore regions, we also installed 11 ocean bottom seismometers (OBSs) just above the aftershock region and its vicinity in order to obtain accurate locations of hypocenters. The OBS observation was carried out from March 27 to April 13, 2005. We further conducted temporary GPS observations in which ten GPS receivers were deployed around the aftershock region. The aftershocks were mainly aligned along an approximately 25-km-long NW-SE trend, and the hypocenters of the main aftershock region were distributed on a nearly vertical plane at depths of 2-16 km. The mainshock was located near the central part of the main aftershock region at a depth of approximately 10 km. The largest aftershock of M(JMA)5.8 occurred near the southeastern edge of the main aftershock region, and the aftershock region subsequently extended about 5 km in the SE direction as defined by secondary aftershock activity. Enlargement of the aftershock region did not occur after the peak in aftershock activity, and the aftershock activity gradually declined. The distribution of hypocenters and seismogenic stress as defined by aftershocks suggest that the 2005 West Off Fukuoka Prefecture Earthquake occurred on the fault that is the NW extension of the Kego fault, which extends NW-SE through the Fukuoka metropolitan area, and that the largest aftershock occurred at the northwestern tip of the Kego fault.

Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake
M. Hori, S. Matsumoto, K. Uehira, T. Okada, T. Yamada, Y. Iio, M. Shinohara, H. Miyamachi, H. Takahashi, K. Nakahigashi, A. Watanabe, T. Matsushima, N. Matsuwo, T. Kanazawa, H. Shimizu
Earth, Planets and Space, 58, 12, 1621, 1626, Springer Berlin, 2006
English, Scientific journal, On March 20, 2005 the West off Fukuoka Prefecture earthquake (magnitude of 7.0 on the JMA scale) occurred in southeastern Japan. The earthquake fault was a left-lateral strike-slip having a nearly vertical fault plane and a strike in the WNW-ESE direction. The largest aftershock with a magnitude of 5.8 (JMA) followed 1 month later. To gain more detailed aftershock data, several teams from different Japanese universities jointly installed a number of temporary seismic stations and positioned Ocean Bottom Seismometers (OBSs) immediately above the focal area. Double-difference tomography was used to estimate the three-dimensional (3D) (Zhang and Thurber, 2003) velocity structures in and around the focal area based on the travel time data collected during seismic observations. The high-velocity regions estimated by the inversion are located on the edge of the aftershock area and on the shallow part of asperity, as inferred from the slip distribution. Conversely, the Vp/Vs ratio is not always as high as that found at the location of the asperity. This finding suggests that the construction of the medium is not uniformly elastic but complex, with different relations between elastic constants and strength. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS)
The Seismological Society of Japan
The Volcanological Society of Japan
The Geodetic Society of Japan
The Japanese Society for Planetary Sciences
TERRAPUB.

B52 Crustal deformation associated with the small eruption on March 2006 of Meakandake Volcano detected by continuous and repeated GPS observation(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)
OKAZAKI Noritoshi, TAKAHASHI Hiroaki, SHIGA Toru, KASAHARA Minoru
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2006, 108, 108, The Volcanological Society of Japan, 2006
Japanese

P81 Small eruption on March 2006 at Meakan-dake volcano, Hokkaido(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)
Hirose W., Okazaki N., Ishimaru S., Tajika J., Nakagawa M., Takahashi H., Hasegawa K., Fujiwara S., Imano E., Nagasawa K., Shigeno N., Sato J., Endo H., Inaba C., Sasaki H.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2006, 195, 195, The Volcanological Society of Japan, 2006
Japanese

P83 Chemical variation of the hot springs and rivers around Meakandake Volcano(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)
MURAYAMA Y., OKAZAKI N., OGINO T., TAMURA M., TAKAHASHI H., NONAKA Y.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2006, 197, 197, The Volcanological Society of Japan, 2006
Japanese

B26 An attempt of real-time magnitude estimation for volcanic eruptions(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)
Takahashi H., Okazaki N., Ueda H., Obara K.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2006, 82, 82, The Volcanological Society of Japan, 2006
Japanese

B18 Crustal Deformation of Tokachi Volcano Detected by Joint Analysis of Multi-agency GPS data(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)
Yamada A., Murakami M., Munekane H., Katayama H., Yamasato H., Yokota T., Okazaki N., Tamura M., Takahashi H., Kasahara M.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2006, 74, 74, The Volcanological Society of Japan, 2006
Japanese

Volcanic inflation of mount Hokkaido-Komagatake, Japan, determined from a dense GPS array
S Iwashita, H Takahashi, N Okazaki, J Miyamura, M Kasahara, M Ichiyanagi, R Takahashi, M Nakagawa
GEOPHYSICAL RESEARCH LETTERS, 32, 20, doi:10.1029/2005GL023438, AMER GEOPHYSICAL UNION, Oct. 2005
English, Scientific journal, We installed and have been operating a dense GPS array with low power consumption single frequency GPS receivers around Mount Hokkaido-Komagatake volcano, southwestern Hokkaido, Japan, since 2000. Data were collected continuously and analyzed together with the Geographical Survey Institute of Japan's nationwide continuous GPS network data. The analysis of daily baseline length changes for two years indicate a steady inflation of the volcanic body with 10(-7)/yr extensional strain. A pressure source was estimated at 2.4 km depth beneath the summit area with a volumetric increase rate of 4.86 x 10(5) m(3)/yr. The depth of the pressure source is in good agreement with the one expected from petrological study. Integrated magma volume has reached up to 2.6 x 10(7) m(3) if the inflation rate is possibly extrapolated back to the last magmatic eruption. Our results strongly suggest a steady magma accumulation at the reservoir beneath this volcano and an increasing potential to the next eruption near future.

2003年十勝沖地震による北海道東部火山フロントに沿った誘発地震活動と静的応力変化との関連性
上田 満治, 高橋 浩晃
地震, 58, 2, 115, 119, 日本地震学会, Sep. 2005
Japanese

The Earthquake of December 14, 2004 (M6.1) at Southern Rumoi District, the Northern Part of Hokkaido　　　　　　　　　　　　　　　
Takahiro Maeda, Tsutomu Sasatani, Masayoshi Ichiyanagi, Teruhiro Yamaguchi, Hiroaki Takahashi, Minora Kasahara
Journal of the Hokkaido University, Faculty of Science, Series VII: Geophysics, 68, 243, 253, Mar. 2005
Japanese, Scientific journal, A shallow-inland earthquake (Mj=6.1) occurred at 14 : 56 on December 14, 2004 (JST) in southern Rumoi district, the northern part of Hokkaido, Japan. There have been no earthquakes having magnitude 6 or more in shallow inland Hokkaido since 1967. In order to investigate the detailed spatial distributions of aftershocks, we performed the temporary seismic observation from December 14 to the present (January, 2005). Wide band and wide dynamic range accelerometers were installed at 9 temporary sites. The hypocenters of aftershocks from December 15 to December 21 (6 days) were determined by using 6 temporary stations and 2 permanent stations near the source area. Aftershocks were concentrated in the area of 10km X 10km and the depth between 2 km and 8 km, and they were distributed on an eastward dipping plane. During the main shock, many strong ground motion records were obtained by the high-dense seismic networks such as K-NET and KiK-net. We constructed spatial distributions of peak ground accelerations (PGA's), peak ground velocities (PGV's) and seismic intensities using these dense network data and found that high PGA, PGV and seismic intensity were mainly seen at the northern side of the epicenter. We also investigated the characteristics of seismograms of the main shock and found that S-waves consist of two pulses originates in the source process. These features strongly suggested that the fault rupture propagated from the hypocenter due north.

A dense GPS observation immediately after the 2004 mid-Niigata prefecture earthquake
Takahashi, H., Matsushima, T., Kato, T., Takeuchi, A., Yamaguchi, T., Kohno, Y., Katagi, T., Fukuda, J., Hatamoto, K., Doke, R., Matsu'ura, Y., Kasahara, M.
Earth, Planets and Space, 57, 7, 661, 665, 2005, [Peer-reviewed]
English, Scientific journal

Type, character and a discovery of landslide induced by the earthquake occurred in Shosanbetsu, Rumoi, Hokkaido, 1874
TAJIKA Jun, TAMURA Makoto, KAWAKAMI Gentaro, HAMADA Seiichi, TAKAHASHI Hiroaki, SHIMURA Kazuo
Annual Meeting of the Geological Society of Japan, 2005, 190, 190, The Geological Society of Japan, 2005
Japanese

The 2003 Tokachi-oki Earthquake, off Southeastern Hokkaido, Japan-Seismic Activities from the Former 1952 Tokachi-oki Earthquake, Foreshock, Mainshock, Aftershocks, and Triggered Earthquakes-
TAKAHASHI HIROAKI, KASAHARA MINORU
地震, 57, 2, 115, 130, 日本地震学会, 27 Dec. 2004
Japanese

Hypocenter Determination for an Unusual Seismic Activity from October 2001 to November 2002, off Tokachi, Hokkaido, Japan, by Using Data from Land-based Observations with Three Ocean Bottom Seismographs
ICHIYANAGI Masayoshi, TAKAHASHI Hiroaki, MOTOYA Yoshinobu, KASAHARA Minoru, HIRATA Kenji, MIKADA Hitoshi
Zisin : Journal of the Seismological Society of Japan, 56, 4, 529, 536, SEISMOLOGICAL SOCIETY OF JAPAN, 25 Mar. 2004
Japanese

Seismic Activity off Tokachi Region, Southeastern Hokkaido, Japan : The Features for 51 Years since the 1952 Tokachi-Oki Earthquake
TAKAHASHI Hiroaki, KASAHARA Minoru
Zisin : Journal of the Seismological Society of Japan, 56, 4, 393, 403, 日本地震学会, 25 Mar. 2004
Japanese, We investigate seismic activity off Tokachi region, southeastern Hokkaido, Japan, where the Pacific plate is subducting beneath the overriding plate, by analyzing hypocenter catalogues produced at Hokkaido University and Japan Meteorological Agency. The time-space distribution of the earthquakes clearly shows a decline in seismic activity in the focal region of the Tokachi-oki earthquake of 4 March 1952 (M8.2) from the early 1990's to the present. Remarkable low seismic activity on the focal region of the 1952 earthquake indicates strong plate coupling. It also implies full stress accumulation generated through relative plate motion without energy release either by seismic or aseismic events after the 1952 event. A simple integration of relative displacement between the two plates after the latest event is approximated at 4.2m. This value equals the mean slip of 4m resulting from the 1952 earthquake. These facts point to a possible occurrence of the next great earthquake with M≥8 in the near future.

2003年十勝沖地震(M_JMA8.0)の余震活動
一柳昌義, 高橋浩晃, 笠原稔
北海道大学地球物理学研究報告, 67, 347, 357, 北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, 15 Mar. 2004
Japanese

Comparison of inter-and co-seismic crustal deformation in Hokkkaido : From the data of the 2003 Tokachi-oki earthquake
高橋 浩晃
Geophysical bulletin of Hokkaido University, 0, 67, 375, 386, 北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Mar. 2004
Japanese

GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (M-JMA 8.0), off southeastern Hokkaido, Japan
H Takahashi, S Nakao, N Okazaki, J Koyama, T Sagiya, T Ito, F Ohya, K Sato, Y Fujita, M Hashimoto, Y Hoso, T Kato, T Iinuma, J Fukuda, T Matsushima, Y Kohno, M Kasahara
EARTH PLANETS AND SPACE, 56, 3, 377, 382, SPRINGER HEIDELBERG, 2004, [Peer-reviewed]
English, Scientific journal, To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake (M-JMA = 8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4-11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake.

GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA 8.0), off southeastern Hokkaido, Japan
Hiroaki Takahashi, Shigeru Nakao, Noritoshi Okazaki, Junji Koyama, Takeshi Sagiya, Takeo Ito, Fumio Ohya, Kazutoshi Sato, Yasuyoshi Fujita, Manabu Hashimoto, Yoshinobu Hoso, Teruyuki Kato, Takeshi Iinuma, Jun’ichi Fukuda, Takeshi Matsushima, Yuhki Kohno, Minoru Kasahara
Earth, Planets and Space, 56, 3, 377, 382, Terra Scientific Pub. Co., 2004
English, Scientific journal, To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake (MJMA=8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4-11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake. © 2004, The Seismological Society of Japan, Society of Geomagnetism and Earth, Planetary and Space Sciences, The Volcanological Society of Japan, The Geodetic Society of Japan, The Japanese Society for Planetary Sciences. All rights reserved.

Seismological monitoring on the 2003 Tokachi-oki earthquake derived from permanent obss and land-based observation a challenge in monitoring m8 earthquake on the ocean floor
Watanabe, T., Takahashi, H., Ichiyanagi, M., Okayama, M., Takada, M., Otsuka, R., Hirata, K., Morita, S., Kasahara, M., Mikada, H.
Ocean '04 - MTS/IEEE Techno-Ocean '04: Bridges across the Oceans - Conference Proceedings, 4, 2004, [Peer-reviewed]
Scientific journal

The 2000 Nemuro-Hanto-Oki earthquake, off eastern Hokkaido, Japan, and the high intraslab seismic activity in the southwestern Kuril Trench
H Takahashi, K Hirata
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 108, B4, 2171, AMER GEOPHYSICAL UNION, Apr. 2003
English, Scientific journal, [1] The 2000 Nemuro-Hanto-Oki earthquake (M(w)6.8) occurred in the southwestern part of the Kuril Trench. The hypocenter was located close to the aftershock region of the great 1994 Kuril earthquake (M(w)8.3), named "the 1994 Hokkaido-Toho-Oki earthquake'' by the Japan Meteorological Agency, for which the fault plane is still in debate. Analysis of the 2000 event provides a clue to resolve the fault plane issue for the 1994 event. The hypocenters of the 2000 main shock and aftershocks are determined using arrival times from a combination of nearby inland and submarine seismic networks with an improved azimuthal coverage. They clearly show that the 2000 event was an intraslab event occurring on a shallow-dipping fault plane between 55 and 65 km in depth. The well-focused aftershock distribution of the 2000 event, the relative location of the 1994 event with respect to the 2000 event, and the similarity between their focal mechanisms strongly suggest that the faulting of the great 1994 earthquake also occurred on a shallow-dipping fault plane in the subducting slab. The recent hypocenter distribution around the 1994 aftershock region also supports this result. Large intraslab earthquakes occurring to the southeast of Hokkaido may occur due to a strong coupling on the plate boundary, which generates relatively large stress field within the subducting Pacific plate.

Source depth dependence of micro-tsunamis recorded with ocean-bottom pressure gauges: The January 28, 2000 Mw 6.8 earthquake off Nemuro Peninsula, Japan
Kenji Hirata, Hiroaki Takahashi, Eric Geist, Kenji Satake, Yuichiro Tanioka, Hiroko Sugioka, Hitoshi Mikada
Earth and Planetary Science Letters, 208, 3-4, 305, 318, Elsevier B.V., 30 Mar. 2003, [Peer-reviewed]
English, Scientific journal, Micro-tsunami waves with a maximum amplitude of 4-6 mm were detected with the ocean-bottom pressure gauges on a cabled deep seafloor observatory south of Hokkaido, Japan, following the January 28, 2000 earthquake (Mw 6.8) in the southern Kuril subduction zone. We model the observed micro-tsunami and estimate the focal depth and other source parameters such as fault length and amount of slip using grid searching with the least-squares method. The source depth and stress drop for the January 2000 earthquake are estimated to be 50 km and 7 MPa, respectively, with possible ranges of 45-55 km and 4-13 MPa. Focal depth of typical inter-plate earthquakes in this region ranges from 10 to 20 km and stress drop of inter-plate earthquakes generally is around 3 MPa. The source depth and stress drop estimates suggest that the earthquake was an intra-slab event in the subducting Pacific plate, rather than an inter-plate event. In addition, for a prescribed fault width of 30 km, the fault length is estimated to be 15 km, with possible ranges of 10-20 km, which is the same as the previously determined aftershock distribution. The corresponding estimate for seismic moment is 2.7×1019 Nm with possible ranges of 2.3×1019-3.2×1019Nm. Standard tide gauges along the nearby coast did not record any tsunami signal. High-precision ocean-bottom pressure measurements offshore thus make it possible to determine fault parameters of moderate-sized earthquakes in subduction zones using open-ocean tsunami waveforms. Published by Elsevier Science B. V.

An Unusual Seismic Activity from October, 2001 to June, 2002, off Tokachi, Hokkaido, Japan.
ICHIYANAGI MASAYOSHI, TAKAHASHI HIROAKI, MOTOYA YOSHINOBU, KASAHARA MINORU, MIKADA HITOSHI, HIRATA KENJI, SUEHIRO KIYOSHI
北海道大学地球物理学研究報告, 66, 87, 99, 北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, 20 Mar. 2003
Japanese

Hypocenter Determination for an Unusual Seismic Activity from October 2001 to November 2002, off Tokachi, Hokkaido, Japan, by Using Data from Land-based Observations with Three Ocean Bottom Seismographs
ICHIYANAGI Masayoshi, TAKAHASHI Hiroaki, MOTOYA Yoshinobu, KASAHARA Minoru, HIRATA Kenji, MIKADA Hitoshi
Zisin (Journal of the Seismological Society of Japan. 2nd ser.), 2, 56, 529, 536, SEISMOLOGICAL SOCIETY OF JAPAN, 2003

日本列島の地殻変動と地震・火山・テクトニクス 多田尭先生を偲ぶ GPS連続観測によるカムチャッカ地域の地殻変動 オホーツクプレートの存在?
笠原稔, 丸山保洋, 高橋浩晃, BAKTHIAROV V F, LEVIN V E, EVGENII G I
月刊地球, 25, 1, 15, 19, 海洋出版, 01 Jan. 2003
Japanese

Double seismic zone in the Hokkaido Island, Southern Kurile Arc, derived from off-Kushiro permanent OBS and land-based observations
T Watanabe, R Otsuka, H Mikada, K Hirata, H Takahashi, M Kasahara, K Suyehiro
3RD INTERNATIONAL WORKSHOP ON SCIENTIFIC USE OF SUBMARINE CABLES AND RELATED TECHNOLOGY, PROCEEDINGS, 133, 136, IEEE, 2003, [Peer-reviewed]
English, International conference proceedings, We located hypocenters for more than two years, using combined datasets from land-based observations and ocean-bottom seismological data acquired by a permanent cabled geophysical observatory system (JAMSTEC system), installed off Kushiro-Tokachi in July 1999. Hypocenter distribution characterizes that 1) double seismic zone just east of the cabled observatory system, 2) a relatively low seismicity west of the cabled system, and 3) characteristic shallow seismic activity below the cabled system.

活動的火山 GPS観測による2000年有珠山噴火前後の地殻変動
岡崎紀俊, 高橋浩晃, 中尾茂, 笠原稔
月刊地球, 22, 28, 01 Dec. 2002
Japanese

Crustal Deformation Associated with the 2000 Eruption of Usu Volcano as Observed by a Dense GPS Array(The 2000 Eruption of Usu Volcano (3))
OKAZAKI Noritoshi, TAKAHASHI Hiroaki, KASAHARA Minoru, ISHIMARU Satoshi, MORI Hitoshi Y, KITAGAWA Sadayuki, FUJIWARA Kenji, CHUREI Masaaki
Bulletin of the Volcanological Society of Japan, 47, 5, 547, 557, Volcanological Society of Japan, 29 Nov. 2002
Japanese, A continuous GPS observation network with 5 stations using single frequency receivers around Usu volcano was installed two days before the 2000 eruption, which took place at the western part of the volcano on 31 March 2000. The cumulative displacements in the radial direction from the center of the volcano reached 1.2 m before the eruption at station HKG located north of the central Usu volcanic massif and 2.3 m at station KNP located 500 m northeast from one of the new craters formed by this eruption. Both displacements were monotonously increasing with time. However at station IZM located...

Geodetic Observations of the 2000 Eruption of Usu Volcano Using Dual Frequency GPS Receivers.
TAKAHASHI HIROAKI, OKAZAKI NORITOSHI, MATSUSHIMA TAKESHI, WATANABE ATSUSHI, MIURA SATOSHI, NAKAO SHIGERU, KATO TERUYUKI, KIMATA FUMIAKI, KASAHARA MINORU
火山, 47, 3, 161, 166, Volcanological Society of Japan, 10 Jul. 2002
Japanese, To monitor the crustal deformation associated with the Usu volcano unrest from 27th March, 2001, we started GPS observations from 28th March, 2001 using Ashtech Z-XII receivers. We succeeded installing 6 new continuous stations around the volcano before the beginning of the eruption at 13:07 (JST), 31st March, 2000. Data were collected via a cellular-phone telemetry system. We carried out automatic rapid data analysis every 3 hours using the Bernese GPS Software Version 4.2, Bernese Processing Engine and IGS predicted ephemeredes. Results were published immediately on the WWW server at Hokkaido University to monitor the volcanic activity. From our GPS observations, we find that: (1) cumulative horizontal displacements from 29th March to noon of 31st March, 2000 exceeded 1 m at the KON, OHD, UVO stations, (2) just before the beginning of the eruption, striking deformation was observed at KON located right above the new crater, (3) after the beginning of the eruption, large scale crustal deformation was generally terminated

GPS観測データからみた北海道東部と日高山脈の地殻変動 (島弧-島弧型日高衝突帯--最新成果速報)
高橋 浩晃
月刊地球, 24, 7, 508, 511, 海洋出版, Jul. 2002
Japanese

Crustal deformation associated with the 2000 eruption of Usu volcano as observed by a continuous GPS observation network.
OKAZAKI NORITOSHI, TAKAHASHI HIROAKI, KASAHARA MINORU, ISHIMARU SATOSHI, MORI HITOSHI, KITAGAWA SADAYUKI, FUJIWARA KENJI, CHUREI MASAAKI
北海道立地質研究所報告, 73, 51, 60, 29 Mar. 2002
Japanese

Summary report of earthflow research at Inasato, Hokkaido.
ISHIMARU SATOSHI, TAJIKA JUN, TAKAMI MASAZO, ENDO YUJI, OKAZAKI NORITOSHI, TAKAHASHI HIROAKI, HIROSE WATARU, KAKIHARA YASUYUKI
北海道立地質研究所報告, 73, 217, 222, 29 Mar. 2002
Japanese

GPS Observation in the Meakan-dake Volcano, Eastern Hokkaido, Japan
高橋 浩晃, 一柳 昌義, 岡崎 紀俊
Geophysical bulletin of Hokkaido University, 65, 65, 303, 309, 北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, 2002
Japanese

GPS観測による2000年有珠山噴火の地殻変動　　　　　　　　　　　　　　　
北海道立地質研究所報告, 73, 51, 60, 2002

GPS観測による2000年有珠山噴火の地殻変動 (特別報告 有珠山2000年噴火特集)
岡崎 紀俊, 高橋 浩晃, 笠原 稔
北海道立地質研究所報告, 0, 73, 51, 60, 北海道立地質研究所, 2002
Japanese

GPS観測による2000年有珠山噴火前後の地殻変動 (総特集 活動的火山) -- (1章 北海道・東北の活動的火山)
岡崎 紀俊, 高橋 浩晃, 中尾 茂
号外地球, 0, 39, 22, 28, 海洋出版, 2002
Japanese

Crustal deformation around Komagatake Volcano in Hokkaido detected by GPS
IWASHITA Satoshi, TAKAHASHI Hiroaki, KASAHARA Minoru, OKAZAKI Noritoshi, MIYAMURA Junichi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2002, 197, 197, The Volcanological Society of Japan, 2002
Japanese

Noise Evaluation of High-speed Sampling GPS Observation
KANESO Takayuki, KOYAMA Junji, MORIYA Takeo, TAKAHASHI Hiroaki
Zisin : Journal of the Seismological Society of Japan, 53, 3, 221, 229, 日本地震学会, 25 Mar. 2001
Japanese, We seek the way of high-speed sampling GPS observation as a broad-band displacementseismomete. For this purpose it is necessary to evaluate the noise level inherent to the GPS observation due to ionospheric and tropospheric effects, multi-path and satellite configuration. In this study, we develop a stand-alone data acquisition system for the continuous high-speed sampling GPS observation after overcoming the troubles in automatic handling the large volume of GPS data. Four GPS stations are establised in Hokkaido area and the period of each observation is half year to year and half. Telemetry of the GPS data using the public telephone line is tested and completed. GPS station coordinates are calculated every second by the GPS kinematic method. Noise reduction for each noise source has been made, and noise levels of horizontal and vertical components after the reduction are about ±4mm, ±7mm, respectively in the case of 150km baseline length. Noise levels of various baseline lengths are also evaluated in different period ranges. These estimates of noises prove that the earthquake larger than JMA magnitude 5.9 can be detected at a GPS station 60km away from the epicenter.

Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan
Teruyuki Kato, Yasuhiro Hirata, Yoshiko Kotake, Shigeru Nakao, John Catane Patrick, Tsutomu Terashima, Toshikazu Chachin, Kunio Fujimori, Kazuro Hirahara, Yoshinobu Hoso, Kajuro Nakamura, Takehide Nakano, Keiichi Tadokoro, Ryuichi Ichikawa, Hiroo Inokuchi, Nobuhiro Isezaki, Tetsuya Iwabuchi, Minoru Kasahara, Fumiaki Kimata, Takashi Okuda, Hiroyuki Kumagai, Yamaoka Koshun, Atsuki Kubo, Takeshi Matsushima, Satoshi Miura, Shigeaki Otsuka, Takao Tabei, Hiroaki Takahashi, Akira Tokuyama, Takeyasu Yamamoto
journal of the geodetic society of japan, 43, 3, 181, 207, 2001, [Peer-reviewed]
English, Scientific journal, The Hyogo-ken Nanbu earthquake (MJMA 7.2), that took place on January 17th, 1995, in Kobe and Awaji area, caused tremendous disasters in the areas. After the earthquake, the Japanese University Consortium for GPS Research (JUNCO) deployed more than 30 GPS receivers around the hypocentral area to find co-seismic and to monitor post-seismic crustal däformations related to the earthquake. Data have been archived first by on-site recordings and later by tele-communcations at the Disaster Prevention Research Institute, Kyoto Univeristy. Temporary dense array terminated by the end of March, 1995. Further temporary occupations were conducted in May, 1995, in November, 1995, and in March, 1996, as well as long term continuous monitorings at selected several sites. The monitorings ended in August, 1996. Co-seismic offsets were observed at several sites around the source area. The largest offsets amounted to 45cm at Iwaya site which is about 4 km east of the Nojima fault. These data were used for simultaneous inversion together with strong motion data to clarify slip distribution on the buried rectangular faults. Post-seismic deformations were also found at all of sites. They mostly showed temporal decay and amounted to 2 to 3 cm. The largest one was observed at Iwaya site. The areal distribution of post-seismic displacement vectors seems to indicate afterslip on the fault planes, but not the areal visco-elastic readjustments. Relaxation processes at Iwaya and Kawaragi sites were fitted by a logarithmic curve. Application of a theory on the mechanics of afterslip based on the constitutive relationship of a fault surface indicated that the fitting give reasonable estimate on the frictional rate parameter or the thickness of velocity-strengthning layer of the earth's surface. Assuming that the constitutive parameter is ranging from 0.001 to 0.005 based on the results of rock experiments, thicknesses of velocity-strengthning layer at Iwaya and Kawaragi were estimated to be ranging between 500m and 2 km, which is consistent with other seismological data. Monitoring of fault offsets using real-time kinematic GPS (RTK-GPS) were also conducted at two baselines crossing the Nojima fault and the Arima-Takatsuki tectonic line, respectively. Though significant deformation was not observed, it showed a potential capability of real time monitorings of ground deformations in a few centimeter accuracy. © 1997, The Geodetic Society of Japan. All rights reserved.

GPS measurement at summit peaks of the Taisetsu mountains, Central Hokkaido, Japan
T Kaneso, J Koyama, T Moriya, H Takahashi
EARTH PLANETS AND SPACE, 52, 11, 1019, 1021, TERRA SCIENTIFIC PUBL CO, 2000
English, Scientific journal, To investigate the precise crustal deformation in the Taisetsu mountains, Central Hokkaido, Japan, we have conducted GPS survey in 1998 and 1999. The coordinates at summit peaks of the mountain chain, horizontal displacements and strain are evaluated in this period. Major results are summarized as (1) horizontal displacements at the summit peaks are about 2 cm in the direction of north, (2) horizontal strain is estimated to be compressional in the NW-SE direction. Although the precision of the estimates awaits for the future survey, this results are consistent with the direction of the compressional axes of focal mechanism solutions of local earthquakes in the surrounding region and with the deformation vector by the triangulation in central Hokkaido.

Crustal deformation associated with the 2000 eruption of Usu volcano : Single frequency GPS receivers observation
Okazaki N., Takahashi H., Kasahara M., Ishimaru S., Mori H. Y.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2000, 168, 168, The Volcanological Society of Japan, 2000
Japanese

The Amurian Plate motion and current plate kinematics in eastern Asia
K Heki, S Miyazaki, H Takahashi, M Kasahara, F Kimata, S Miura, NF Vasilenko, A Ivashchenko, KD An
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 104, B12, 29147, 29155, AMER GEOPHYSICAL UNION, Dec. 1999, [Peer-reviewed]
English, Scientific journal, We use Global Positioning System (GPS) velocity data to model eastern Asian plate kinematics. Out of 15 stations in Korea, Russia, China, and Japan studied here, three sites considered to be on the stable interior of the hypothetical Amurian Plate showed eastward velocities as fast as similar to 9-10 mm/yr with respect to the Eurasian Plate. They were stationary relative to each other to within 1 mm/yr, and these velocity vectors together with those of a few additional sites were used to accurately determine the instantaneous angular velocity (Euler) vector of the Amurian Plate. The predicted movement between the Amurian and the North American Plates is consistent with slip vectors along the eastern margin of the Japan Sea and Sakhalin, which reduces the necessity to postulate the existence of the Okhotsk Plate. The Euler vector of the Amurian Plate predicts left-lateral movement along its boundary with the south China block, consistent with neotectonic estimates of the displacement at the Qinling fault, possibly the southern boundary of the Amurian Plate. The Amurian Plate offers a platform for models of interseismic strain buildup in southwest Japan by the Philippine Sea Plate subduction at the Nankai Trough. Slip vectors along the Baikal rift, the boundary between the Amurian and the Eurasian Plates, are largely inconsistent with the GPS-based Euler vector, suggesting an intrinsic difficulty in using earthquake slip vectors in continental rift zones for such studies.

Velocity field of around the Sea of Okhotsk and Sea of Japan regions determined from a new continuous GPS network data
H Takahashi, M Kasahara, F Kimata, S Miura, K Heki, T Seno, T Kato, N Vasilenko, A Ivashchenko, Bahtiarov, V, Levin, V, E Gordeev, F Korchagin, M Gerasimenko
GEOPHYSICAL RESEARCH LETTERS, 26, 16, 2533, 2536, AMER GEOPHYSICAL UNION, Aug. 1999, [Peer-reviewed]
English, Scientific journal, To investigate the current crustal movements in and around the Sea of Okhotsk and Sea of Japan regions, we have established a continuous GPS network. By the end of 1997, the network had been expanded to include 12 new stations. Data for the period from July 1995 to November 1997 were analyzed together with data from International GPS Service for Geodynamics (IGS) global stations. To fix the estimated coordinates to the terrestrial reference frame, the Tsukuba IGS station was assumed to be moving westward relative to the stable Eurasian continent at similar to 2cm/yr according to Heki's[1996] estimate. We find that: (1) stations in the western margin of the Sea of Japan have eastward velocity vectors, (2) the pole position of the Okhotsk plate is located near Okha, which reconfirms the Okhotsk micro plate, (3) a plate boundary of the Okhotsk and Amurian plates between southen Sakhalin and Hokkaido is suggested.

Deep, low frequency microearthquakes occurring in Hokkaido
Takahashi Hiroaki, Miyamura Junichi, Gouke Kouji
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 1998, 112, 112, The Volcanological Society of Japan, 1998
Japanese

Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan
KATO Teruyuki, CATANE John, patrick l, CHACHIN Toshikazu, FUJIMORI Kunio, HIRAHARA Kazuro, HIRATA Yasuhiro, HOSO Yoshinobu, ICHIKAWA Ryuichi, INOKUCHI Hiroo, ISEZAKI Nobuhiro, IWABUCHI Tetsuya, KASAHARA Minoru, KIMATA Fumiaki, KOTAKE Yoshiko, KUBO Atsuki, KUMAGAI Hiroyuki, MATSUSHIMA Takeshi, MIURA Satoshi, NAKAMURA Kajuro, NAKANO Takehide, NAKAO Shigeru, OKUDA Takashi, OTUSKA Shigeaki, TABEI Takao, TADOKORO Keiichi, TAKAHASHI Hiroaki, TERASHIMA Tsutomu, TOKUYAMA Akira, YAMAMOTO Takeyasu, YAMAOKA Koshun
Journal of the Geodetic Society of Japan, 43, 3, 181, 207, 日本測地学会, 25 Sep. 1997
Japanese

On the eruption of Karymsky of January, 1996 and temporal seismic and GPS observations
Kasahara M., Takahashi H., Okayama M., Miyamachi H., Heki K., Maguskin Mefodi, Levin Vassily, Bahtiarov Vilory, Gordeev Evgenii
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 1996, 58, 58, The Volcanological Society of Japan, 1996
Japanese

High-Sampling Kinematic GPS Observation at the Karymsky Volcano, Kamchatka
Takahashi H., Kasahara M., Heki K., Maguskin M. A., Levin V. E., Bashatiarov V. F.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 1996, 59, 59, The Volcanological Society of Japan, 1996
Japanese

GPS observations of post-seismic crustal movements in the focal region of the 1995 Hyogo-ken Nanbu Earthquake - Static and real-time kinematic GPS observations
K Hirahara, T Nakano, M Kasahara, H Takahashi, R Ichikawa, S Miura, T Kato, S Nakao, Y Hirata, Y Kotake, T Chachin, F Kimata, K Yamaoka, T Okuda, H Kumagai, K Nakamura, K Fujimori, T Yamamoto, T Terashima, JPL Catane, K Tadokoro, A Kubo, S Otsuka, A Tokuyama, T Tabei, T Iwabuchi, T Matsushima
JOURNAL OF PHYSICS OF THE EARTH, 44, 4, 301, 315, CENTER ACADEMIC PUBL JAPAN, 1996, [Peer-reviewed]
English, Scientific journal, Post-seismic deformations in the focal region of the 1995 Hyogo-ken Nanbu earthquake (M=7.2), in southwest Japan, which occurred on January 17 (JST), were observed with GPS observations. We deployed more than 30 GPS stations in and around the area of aftershock activity within several days after the occurrence of the earthquake. First the data were stored and manually collected at the observation sites, but by the middle of February the data at most of sites were started to be telemetered through public phone lines to data centers. GPS observations continued until the end of March, except for 4 sites left active for monitoring long-term deformations. We used two types of GPS observations, usual static and real-time kinematic GPS observations. Static day-by-day analyses, which are based on 24-h data sampled every 30 s, show the deformation associated with post-seismic readjustment with a relaxation time of about 70 days and with an amplitude of 1-2 cm in the area close to the epicenter. Also, rapid movements were observed just after the occurrence of the earthquake. However, since our analyses are only preliminary, further analyses are needed to clarify these observations and to investigate models of post-seismic deformations. Real-time kinematic GPS observations, which is a new type of GPS observations, were made every is from February 9 to March 22 for detecting possible rapid relative movements between two sites across the surface fault trace on Awaji Island and across the other fault, the Arima-Takatsuki Tectonic Fault on the Kobe side. Present real-time kinematic GPS observations show scatters with the amplitude of 0.5-3.0 cm depending on components and baseline lengths. Any motions with amplitudes larger than these noise levels could not be detected during the observation period.

GNSS-Acoustic seafloor geodetic observations and their results along the Japan-Kuril trench
富田史章, 木戸元之, 飯沼卓史, 太田雄策, 日野亮太, 大園真子, 高橋浩晃, PLATA-MARTINEZ Raymondo, 野徹雄, 中東和夫, 中村恭之, 日本地震学会秋季大会講演予稿集(CD-ROM), 2023, 2023

Supercritical geothermal system in the Niseko area, Shiribeshi region, southwestern Hokkaido
田村慎, 岡大輔, 岡崎紀俊, 鈴木浩一, 中川光弘, 橋本武志, 高橋浩晃, 大園真子, 一柳昌義, 茂木透, 日本地熱学会学術講演会講演要旨集, 2021, 2021

北海道南西沖地震に伴う津波 : 小樽から礼文島まで (復刻 北海道南西沖地震と津波 : 2部 津波(1))
後藤 章夫, 高橋 浩晃, 宇津木 充, 小野 忍, 西田 泰典, 大島 弘光, 笠原 稔, 竹中 博士, 斉田 智治, 月刊地球 = Chikyu monthly, 42, 4, 214, 219, Apr. 2020
海洋出版, Japanese

絶対重力計との比較による超伝導重力計のスケールファクターの推定 : 2019年9月北海道大学弟子屈観測所において　　　　　　　　　　　　　　　
名和, 一成, 今西, 祐一, 西山, 竜一, 高橋, 浩晃, 大園, 真子, 岡田, 和見, 山口, 照寛, 本多, 亮, 北海道大学地球物理学研究報告, 83, 97, 101, Mar. 2020
Japanese

2019年に発生した札幌市西区福井・平和付近の地震活動　　　　　　　　　　　　　　　
一柳, 昌義, 大園, 真子, 高田, 真秀, 高橋, 浩晃, 北海道大学地球物理学研究報告, 83, 1, 7, Mar. 2020
Japanese

Survey and potential evaluation of supercritical geothermal resources in Eastern Japan and Kyushu-supercritical geothermal system in Shiribeshi area, Hokkaido-
田村慎, 岡大輔, 岡崎紀俊, 鈴木浩一, 中川光弘, 橋本武志, 高橋浩晃, 茂木透, 日本地熱学会学術講演会講演要旨集, 2020, 2020

平成30年北海道胆振東部地震とその災害に関する総合調査
高橋 浩晃, 勝俣 啓, 大園 真子, 橋本 武志, 青山 裕, 酒井 慎一, 松本 聡, 岡田 知己, 小菅 正裕, 寺川 寿子, 飯尾 能久, 中尾 茂, 上嶋 誠, 柴田 智郎, 大津 直, 高井 伸雄, 飯場 正紀, 渡部 要一, 菊地 優, 岡崎 太一郎, 白井 和貴, 西村 裕一, 石川 達也, 高瀬 裕也, 永井 宏, 宮森 保紀, 三宅 弘恵, 松島 信一, 浅野 公之, 重藤 迪子, 卜部 厚志, 前田 宜浩, 石澤 友浩, 廣瀬 亘, 小山内 信智, 山田 孝, 笠井 美青, 檜垣 大助, 風間 基樹, 千木良 雅弘, 渦岡 良介, 竹林 洋史, 木村 誇, 石丸 聡, 岡田 成幸, 内田 賢悦, 有村 幹治, 植松 武是, 多々納 裕一, 梶谷 義雄, 能島 暢呂, 田村 圭子, 中村 洋光, 戸松 誠, 自然災害科学総合シンポジウム講演論文集, 56, 56, 21, 26, 11 Sep. 2019, [Domestic magazines]
2019年9月11日(水), 於 : キャンパスプラザ京都 第1講義室「平成30年北海道胆振東部地震」とその災害に関する総合調査を実施した。震度７を記録した揺れにより, 同時多発斜面災害と, 北海道全域同時停電(ブラックアウト)が発生し, 複合的な災害となった。震源の深さは約37kmで, 大すべり域はそれより浅い20-25km付近であった。木造家屋の倒壊が多発したむかわ町市街では, 地盤構造による地震波の増幅が見られた。同時多発斜面崩壊は, 近隣の活火山の噴火による降下火砕堆積物が素因となった。札幌市内の地盤液状化地帯では, 極めて軟弱な谷埋盛土層が確認された。地震発生が未明であったことが, 建物倒壊による直接死が出なかったことに関係している可能性がある。ブラックアウトは, 社会経済活動に大きな影響を与えた。, 京都大学防災研究所自然災害研究協議会, Japanese

Tiltmerer observation in Avachinsky volcano, Kamchatka, Russia　　　　　　　　　　　　　　　
Takahashi, H, H. Aoyama, M. Ohzono, R. Tanaka, C. Ito, S. Watanabe, T. Matsushima, Y. Yamashita, H. Miyamachi, S. Okuyama, E. Gordeev, Y. Muraviyev, K. Maguskin, N. Malik, I. Minorov, D. Chebrov, Geophysical Bulletin of Hokkaido University, 82, 11, 18, Mar. 2019
Japanese

ニセコ山系東部における地熱構造モデリング
岡大輔, 田村慎, 鈴木隆広, 大森一人, 岡崎紀俊, 高橋浩晃, 大園真子, 茂木透, 日本地熱学会学術講演会講演要旨集, 2019, 2019

北海道胆振地方の地震波速度構造
椎名高裕, 勝俣啓, 一柳昌義, 高橋浩晃, 中村亮一, 加藤愛太郎, 大園真子, 青山裕, 田中良, 高田真秀, 山口照寛, 岡田和見, 酒井慎一, 松本聡, 岡田知己, 松澤暢, 平野舟一郎, 寺川寿子, 堀川信一郎, 小菅正裕, 片尾浩, 飯尾能久, 長岡愛理, 津村紀子, 上野友岳, 日本地震学会秋季大会講演予稿集(CD-ROM), 2019, 2019

2018年北海道胆振東部地震の余震の震源メカニズム解と応力場
薄田悠樹, 勝俣啓, 一柳昌義, 大園真子, 青山裕, 田中良, 高田真秀, 山口照寛, 岡田和見, 高橋浩晃, 酒井慎一, 松本聡, 岡田知己, 松澤暢, 平野舟一郎, 寺川寿子, 堀川信一郎, 小菅正弘, 片尾浩, 飯尾能久, 長岡愛理, 津村紀子, 上野友岳, 日本地震学会秋季大会講演予稿集(CD-ROM), 2019, 2019

Measurements for vertical gradient of gravity on active crater region in Tokachi-dake volcano, Hokkaido
TAKAHASHI Hiroaki, Mako OHZONO Mako, ICHIYANAGI Masayoshi, YAMAGUCHI Teruhiro, OKADA Kazumi, SAITO Kazuma, FUWA Satoshi, ITO Chihiro, OKAZAKI Noritoshi, TAKAGI Akimichi, HONDA Ryo, Geophysical bulletin of Hokkaido University, 81, 81, 57, 60, Mar. 2018
北海道大学大学院理学研究院, Japanese

3次元速度構造を考慮した襟裳岬周辺における地震の震源決定
椎名高裕, 高橋浩晃, 勝俣啓, 一柳昌義, 北海道大学地球物理学研究報告, 81, 33, Mar. 2018
Japanese

十勝岳重力観測網での2機種の相対重力計による測定値の比較
岡田, 和見, 岡田和見, 高橋浩晃, 一柳昌義, 岡崎紀俊, 高木朗充, 北海道大学地球物理学研究報告, 81, 81, 27, Mar. 2018
Japanese

Seismic activity associated with the 2014 Shiraoi earthquake（MJMA 5.6）in middle east Iburi region, Hokkaido (Hypocenter data file)
ICHIYANAGI Masayoshi, SHESTAKOV Nikolay V., OKUYAMA Satoshi, OHZONO Mako, KASAHARA Minoru, TAKAHASHI Hiroaki, Geophysical bulletin of Hokkaido University, 81, 81, 17, 1, Mar. 2018
北海道大学大学院理学研究院, English

道東カルデラ火山地域における絶対重力測定
名和一成, 宮川歩夢, 山崎雅, 望月一磨, 高橋浩晃, 大園真子, 岡田和見, 岡大輔, 岡崎紀俊, 本多亮, 北海道大学地球物理学研究報告, 81, 11, Mar. 2018
Japanese

CG-5重力計の登山を伴う野外調査時における重力値安定性の基礎調査
高木朗充, 宮城洋介, 小澤拓, 本多亮, 高橋浩晃, 北海道大学地球物理学研究報告, 81, 81, 1, 10, Mar. 2018
Japanese

ニセコ山系東部における地下構造推定のための精密重力探査
岡大輔, 岡崎紀俊, 鈴木隆広, 高橋浩晃, 大園真子, 山口照寛, 日本地熱学会学術講演会講演要旨集, 2018, 2018

2016年熊本地震後のGNSSによる地殻変動観測(3)
中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見, 日本測地学会講演会要旨, 130th, 2018

大規模人工地震探査による南九州下の地殻構造の解明(2)予備的成果と2018年観測計画
宮町宏樹, 高橋浩晃, 青山裕, 椎名高裕, 高田真秀, 一柳昌義, 山口照寛, 小野夏生, 齊藤一真, 伊藤ちひろ, 村井芳夫, 筒井智樹, 井上雄介, 竹井瑠一, 山本希, 平原聡, 中山貴史, 東龍介, 大友周平, 日野亮太, 阿部英二, 蔵下英司, 岩崎貴哉, 篠原雅尚, 山田知朗, 中東和夫, 渡辺俊樹, 前田裕太, 堀川信一郎, 奥田隆, 辻修平, 長谷川大真, 片尾浩, 澁谷拓郎, 三浦勉, 中川潤, 加藤慎也, 山下裕亮, 松島健, 手操佳子, 宮町凜太郎, TRIAHADINI Agnis, 磯田謙心, 清水洋, 小林励司, 早田正和, 仲井一穂, 八木原寛, 平野舟一郎, 田中康久, 川崎慎治, 佐藤紀男, 日本地震学会秋季大会講演予稿集(CD-ROM), 2018, 2018

2016年熊本地震と関連する活動に関する総合調査
清水洋, 松本聡, 酒井慎一, 岡田知己, 渡辺俊樹, 飯尾能久, 相澤広記, 松島健, 高橋浩晃, 中尾茂, 鈴木康弘, 後藤秀昭, 大倉敬宏, 山本希, 中道治久, 山中浩明, 神野達夫, 三宅弘恵, 纐纈一起, 浅野公之, 松島信一, 福岡浩, 若井明彦, 大井昌弘, 田村圭子, 木村玲欧, 井ノ口宗成, 前原喜彦, 赤星朋比古, 矢田俊文, 自然災害科学総合シンポジウム要旨集, 54, 54, 1, 30, 14 Sep. 2017
平成29年9月14日(木), 於 : 京都大学化学研究所共同研究棟1階大セミナー室2016年熊本地震に関して, 地震・地殻変動観測や変動地形学的調査に加え, 強震動, 土砂災害, 災害情報, 災害過程, 災害医療, 歴史資料などの総合的調査を実施した。2016 年熊本地震は, 布田川・日奈久断層帯の右横ずれ運動によって発生したが, 走向・傾斜などの断層形状が異なる複数の断層面が活動したことが明らかになった。被害の大きさと余震の加速度振幅の空間分布には強い相関が認められた。地すべりについては, せん断時に発生する過剰間隙水圧が発生要因の一つであることを明らかにした。熊本地震災害は, 都市型災害と中山間地域の災害が同時に発生した広域複合災害であることを示し, エコノミークラス症候群などの災害医療も含め, それらの教訓と対策を考察した。, 京都大学防災研究所自然災害研究協議会, Japanese

2016年熊本地震後のGNSSによる地殻変動観測
中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見, 日本測地学会講演会要旨, 128th, 2017

2016年熊本地震後のGNSSによる余効変動の観測(2)
中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見, 日本地震学会秋季大会講演予稿集(CD-ROM), 2017, 2017

2016年熊本地震後のGNSSによる地殻変動観測
中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見, 日本測地学会講演会要旨, 126th, 2016

2016年熊本地震後のGNSSによる余効変動の観測
中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見, 日本地震学会秋季大会講演予稿集, 2016, 2016

GNSSによる2016年熊本地震発生後の地殻変動観測
中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見, 日本地球惑星科学連合大会予稿集(Web), 2016, 2016

Urgent joint seismic observation of the 2016 Kumamoto earthquake-Seismic activities and their background-
SHIMIZU Hiroshi, IIO Yoshihisa, SAKAI Shin’ichi, OKADA Tomomi, TAKAHASHI Hiroaki, WATANABE Toshiki, GOTO Kazuhiko, OHKURA Takahiro, ASANO Youichi, MATSUSHIMA Takeshi, YAMASHITA Yusuke, NAKAMOTO Manami, MIYAZAKI Masahiro, MATSUMOTO Satoshi, AIZAWA Koki, SHITO Azusa, UCHIDA Kazunari, MIYAMACHI Rintaro, KAMIZONO Megumi, TEGURI Yoshiko, MIYAMACHI Hiroki, NAKAO Shigeru, YAKIWARA Hiroshi, HIRANO Shuichiro, OHZONO Mako, SHIINA Takahiro, TAKADA Masamitsu, ICHIYANAGI Masayoshi, YAMAGUCHI Teruhiro, OKADA Kazumi, KOSUGA Masahiro, AZUMA Ryosuke, UCHIDA Naoki, EMOTO Kentaro, OHTA Yusaku, KAIDA Toshiki, KOZONO Tomofumi, SUZUKI Syuichi, TAKAGI Ryota, DEMACHI Tomotsugu, NAKAHARA Hisashi, NAKAYAMA Takashi, HIRAHARA Satoshi, MATSUZAWA Toru, MIURA Satoshi, YAMAMOTO Mare, IWASAKI Takaya, HIRATA Naoshi, IIDAKA Takashi, KURASHIMO Eiji, KATO Aitaro, NAKAGAWA Shigeki, YAMANAKA Yoshiko, ITO Takeo, TERAKAWA Toshiko, MAEDA Yuta, HORIKAWA Shinichiro, MATSUHIRO Kenjiro, OKUDA Takashi, KATAO Hiroshi, KANO Yasuyuki, MIURA Tsutomu, TSUDA Hiroo, MURAMOTO Tomoya, OKUBO Makoto, YAMASHINA Tadashi, UENO Tomotake, 日本地球惑星科学連合大会予稿集(Web), 2016, 2016

カムチャツカ・クルチェフスコイ火山でのGNSS傾斜計観測
高橋浩晃, 大園真子, 青山裕, 宮町宏樹, 松島健, 山下裕亮, GORDEEV E., MURAVYEV Y., SEROVETNIKOV S., 日本測地学会講演会要旨, 126th, 2016

カムチャッカ・クリュチェフスコイ火山での連続GNSS観測
大園真子, 高橋浩晃, 青山裕, 宮町宏樹, 松島健, 山下裕亮, GORDEEV E., YAROSRAV M., SEROVETNIKOV S., 日本火山学会講演予稿集, 2016, 2016

2016年熊本地震発生域における緊急合同地震観測-臨時地震観測網の構築-
中元真美, 松本聡, 松島健, 酒井慎一, 山下裕亮, 宮崎真大, 飯尾能久, 岡田知己, 高橋浩晃, 渡辺俊樹, 後藤和彦, 浅野陽一, 清水洋, 日本地球惑星科学連合大会予稿集(Web), 2016, 2016

B1-08 Magma re-accumulation inferred from crustal deformation at Kirishima Volcano
Nakao S., Morita Y., Goto K., Yakiwara H., Hirano S., Oikawa J., Ueda H., Takahashi H., Ohta Y., Matsushima T., Iguchi M., Programme and abstracts the Volcanological Society of Japan, 2014, 62, 62, 02 Nov. 2014
Volcanological Society of Japan, Japanese

A2-03 Ultra-long period tremor during Strombolian eruption activity at Klyuchevkoi volcano
Takahashi H., Aoyama H., Nakagawa M., Matsushima T., Miyamachi H., Gordeev E., Muravyev Y., Serovetnikov S., Programme and abstracts the Volcanological Society of Japan, 2013, 22, 22, 29 Sep. 2013
Volcanological Society of Japan, Japanese

北海道南西沖地震に伴う津波 : 小樽から礼文島まで (総特集 津波災害)
後藤 章夫, 高橋 浩晃, 宇津木 充, 月刊地球, 35, 1, 47, 52, Jan. 2013
海洋出版, Japanese

P08 High-sampling Ground Tilt Observations at Kliuchevskoi Volcano, Kamchatka
Matsushima T., Takahashi H., Aoyama H., Nakagawa M., Miyamachi H., Goto A., Sergey Serovetnikov, Yaroslav Muravyev, Evgeny Gordeev, Programme and abstracts the Volcanological Society of Japan, 2012, 106, 106, 14 Oct. 2012
Volcanological Society of Japan, Japanese

B1-15 What happens in the Initial Phase of Magma Accumulation Process prior to Sub-Plinian Eruptions at Kirishima Volcano on Jan. 2011
Nakao S., Morita Y., Goto K., Yakiwara H., Hirano S., Oikawa J., Ueda H., Kozono T., Hirata Y., Takahashi H., Ichiyanagi M., Ohta Y., Matsushima T., Iguchi M., Programme and abstracts the Volcanological Society of Japan, 2012, 61, 61, 14 Oct. 2012
Volcanological Society of Japan, Japanese

021 Strong Ground Motions and Questionnaire Seismic Intensity Survey of December 2, 2010 Ishikari Depression Earthquake (Mj4.6)
SHIGEFUJl Michiko, 日本建築学会北海道支部研究報告集, 84, 83, 86, 02 Jul. 2011
Architectural Institute of Japan, Japanese

「雌阿寒火山を知る」ための取り組み-雌阿寒火山塾-
廣瀬亘, 岡崎紀俊, 石丸聡, 野中祐子, 高橋浩晃, 笠原稔, 日本火山学会講演予稿集, 2011, 2011

Postseismic displacements following the 2007 Noto peninsula earthquake detected by dense GPS observation
HASHIMOTO Manabu, TAKAHASHI Hiroaki, DOKE Ryosuke, KASAHARA Minoru, TAKEUCHI Akira, ONOUE Kensuke, HOSO Yoshinobu, FUKUSHIMA Yo, NAKAMURA Kajuro, OHYA Fumio, HONDA Ryo, ICHIYANAGI Masayoshi, YAMAGUCHI Teruhiro, MAEDA Takahiro, HIRAMATSU Yoshihiro, EPS, 60, 2, 139, 144, 01 Feb. 2008
Terra Scientific Pub. Co., English

稠密GPS観測網による2008年岩手・宮城内陸地震の余効変動の時空間変化推定
飯沼卓史, 大園真子, 太田雄策, 三浦哲, 植木貞人, 高塚晃多, 対馬弘晃, 立花憲司, 松島健, 中元真美, 山下裕亮, 鷺谷威, 小澤和浩, 福田真人, 朝日友香, 笠原稔, 高橋浩晃, 山口照寛, 中尾茂, 日本測地学会講演会要旨, 110th, 2008

2008年岩手・宮城内陸地震(M7.2)に伴った地震時・地震後地殻変動
三浦哲, 太田雄策, 大園真子, 飯沼卓史, 立花憲司, 植木貞人, 高塚晃太, 宮尾佳世, 佐藤俊也, 対馬弘晃, 高橋浩晃, 山口照寛, 笠原稔, 鷺谷威, 小澤和浩, 福田真人, 朝日友香, 松島健, 中元真美, 山下裕亮, 中尾茂, 日本地震学会秋季大会講演予稿集, 2008, 2008

有珠山の地殻変動予測に関する研究
岡崎紀俊, 大津直, 廣瀬亘, 石丸聡, 田村慎, 川上源太郎, 田近淳, 高橋浩晃, 橋本武志, 茂木透, 笠原稔, 北海道立地質研究所調査研究報告(CD-ROM), 35, 150P,SUPPL 1P, 30 Mar. 2007
Japanese

稠密GPS観測網による2007年中越沖地震の余効変動観測 その2 余効変動の時空間変化推定
飯沼卓史, 太田雄策, 三浦哲, 立花憲司, 長谷川昭, 宮尾佳世, 松島健, 平尾暁彦, 高橋浩晃, 前田宜浩, 山口照寛, 高田真秀, 宮崎真一, 岩國真紀子, 落唯史, 鷺谷威, 伊藤武男, MEILANO Irwan, 道家涼介, 竹内章, 日本測地学会講演会要旨, 108th, 2007

稠密GPS連続観測による2007年能登半島地震の余効変動
橋本学, 尾上謙介, 細善信, 福島洋, 大谷文夫, 中村佳重郎, 高橋浩晃, 笠原稔, 本多亮, 一柳昌義, 山口照寛, 前田宜浩, 道家涼介, 柳井啓広, 竹内章, 平松良浩, 日本測地学会講演会要旨, 108th, 2007

稠密GPS観測網による2007年中越沖地震の余効変動観測 その1-GPS臨時観測の概要-
太田雄策, 三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, MEILANO Irwan, 日本測地学会講演会要旨, 108th, 2007

稠密GPS連続観測による2007年能登半島地震の余効変動
橋本学, 高橋浩晃, 笠原稔, 本多亮, 一柳昌義, 山口照寛, 前田宜浩, 道家涼介, 柳井啓広, 竹内章, 尾上謙介, 細善信, 福島洋, 大谷文夫, 中村佳重郎, 平松良浩, 日本地震学会秋季大会講演予稿集, 2007, 2007

稠密GPS観測に基づく2007年中越沖地震の余効変動
太田雄策, 三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, MEILANO Irwan, 日本地震学会秋季大会講演予稿集, 2007, 2007

緊急地震観測による福岡県西方沖地震の特徴について
清水洋, 高橋浩晃, 岡田知己, 金沢敏彦, 飯尾能久, 宮町宏樹, 松島健, 一柳昌義, 内田直希, 岩崎貴哉, 片尾浩, 後藤和彦, 松本聡, 平田直, 中尾茂, 植平賢司, 篠原雅尚, 八木原寛, 亀伸樹, 卜部卓, 松尾のり道, 山田知朗, 渡辺篤志, 中東和夫, ENESCU Bogdan, 内田和也, 橋本信一, 平野舟一郎, 八木健夫, 河野裕希, 上野友岳, 斉藤政城, 堀美緒, West Jpn NDIC News (Natural Disaster Inf Cent West Jpn), 33, 3, 6, Jun. 2005
Japanese

2004年12月14日留萌支庁南部の地震(M 6.1)
前田宜浩, 笹谷努, 一柳昌義, 山口照寛, 高橋浩晃, 笠原稔, 北海道大学地球物理学研究報告, 68, 243, 253, 15 Mar. 2005
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

Seismic Activity in the Coastsl Area of Rumoi Subprefecture and Tectonics in Northern Hokkaido, Japan
高橋 浩晃, 笠原 稔, Geophysical bulletin of Hokkaido University, 68, 68, 199, 218, 2005
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

2003年十勝沖地震 4章 地殻変動・電磁気連続観測 ちゅう密GPS観測による2003年十勝沖地震の余効変動観測
笠原稔, 高橋浩晃, 岡崎紀俊, 中尾茂, 鷺谷威, 伊藤武男, 大谷文夫, 佐藤一敏, 松島健, 月刊地球, 105, 111, Jan. 2005
Japanese

稠密GPS観測による2003年十勝沖地震の余効変動観測　　　　　　　　　　　　　　　
笠原 稔, 高橋 浩晃, 岡崎 紀俊, 中尾 茂, 鷺谷 威, 伊藤 武男, 大谷 文夫, 佐藤 一敏, 藤田 安良, 橋本 学, 細 善信, 加藤 照之, 飯沼 卓史, 福田 淳一, 松島 健, 河野 裕希, 月刊 地球, 号外, 49, 105-111, 2005
Japanese, Report research institution

Summary report of earthflow research at inasato, Hokkaido [JE] : Mountains and slopes(GEOMORPHOLOGICAL ABSTRACTS (2001) From scientific papers published in Japan) :
Ishimaru Satoshi, Tajika Jun, Takami Masazo, Endou Yuuji, Okazaki Noritoshi, Takahashi Hiroaki, Hirose Wataru, Kakihara Yasuyuki, 地形, 23, 4, 701, 701, 2002
日本地形学連合, Japanese

Crustal deformation associated with the 2000 eruption of Usu volcano as observed by a continuous GPS observation network [JE] : Volcanism(GEOMORPHOLOGICAL ABSTRACTS (2001) From scientific papers published in Japan ) :
Okazaki Noritoshi, Takahashi Hiroaki, Kasahara Minoru, Ishimaru Satoshi, Mori Hitoshi Y., Kitagawa Sadayuki, Fujisawa Kenji, Churei Masaaki, 地形, 23, 4, 716, 717, 2002
日本地形学連合, Japanese

Dense GPS Network in Kutcharo Caldera, Hokkaido, Japan.
TAKAHASHI HIROAKI, ICHIYANAGI MASAYOSHI, TAMURA MAKOTO, WAITHAKA H, KASAHARA MINORU, 北海道大学地球物理学研究報告, 64, 155, 164, 27 Mar. 2001
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

GPS Measurement at Summit Peaks of the Taisetsu Mountains, Central Hokkaido, Japan.
KOYAMA JUNJI, MORIYA TAKEO, KANESO TAKAYUKI, TAKAHASHI HIROAKI, 北海道大学地球物理学研究報告, 63, 15, 21, 15 Mar. 2000
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

Estavblishing a Volcano GPS Network on and around Mt. Tarumai.
MORI HITOSHI, IGUCHI MASATO, ONO HIROYASU, MUNEKANE HIROSHI, UEKI SADATO, TAKAHASHI HIROAKI, TAKAYAMA TETSURO, ONIZAWA SHIN'YA, YAMAWAKI TERUO, 北海道大学地球物理学研究報告, 63, 77, 82, 15 Mar. 2000
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

Dense GPS Array around the Craters of the Tokachi Volcano for Determination of Crustal Deformation
高橋 浩晃, 一柳 昌義, 岡崎 紀俊, 北海道大学地球物理学研究報告, 63, 33, 42, Mar. 2000
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

GPS観測による2000年有珠山噴火前後の地殻変動 -2周波受信機による観測-
高橋浩晃, 日本火山学会2000年度秋季大会講演要旨集, 2, 41, 41, 2000

Northeast Japan transect. Island arc deformation and crustal activity. 4 Crustal structure and crustal activity in Hokkaido in issue. Tectonics of Hokkaido as derived the latest crustal movement.
KASAHARA MINORU, TAKAHASHI HIROAKI, 月刊地球, 194, 199, 01 Dec. 1999
Japanese

最近の地殻変動から見た北海道のテクトニクス (総特集 東北日本トランセクト--島弧変形と地殻活動) -- (北海道の地殻構造と地殻活動の諸問題)
笠原 稔, 高橋 浩晃, 号外地球, 27, 194, 199, Dec. 1999
海洋出版, Japanese

北海道で発生した深部低周波地震
高橋 浩晃, 宮村 淳一, 郷家 幸治, 北海道大学地球物理学研究報告, 25, 41, Mar. 1999
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

Hypocenter Distribution Observed Dense Temporal Seismic Station Network on Tokachi-dake Volcano, Central Hokkaido
一柳 昌義, 高橋 浩晃, 田村 慎, 和田 直人, 青木 良江, 勝俣 啓, 笠原 稔, 吉田 邦一, 佐波 瑞恵, 岡崎 紀俊, 石丸 聡, 近藤 広秋, 宮村 淳一, 佐藤 十一, 池田 友紀子, 宮本 聖史, 槙納 智裕, 『北海道大学地球物理学研究報告』, 62, 62, 43, 60, 1999
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

Re-determination of the Movement of the Amurian Plate
HEKI Kosuke, MIYAZAKI Shin'ichi, TAKAHASHI Hiroaki, KASAHARA Minoru, KIMATA Fumiaki, MIURA Satoshi, SENO Tetsuzo, VASILENKO N., IVASHCHENKO A., KORCHAGIN F., GITOKU An, 日本地震学会講演予稿集 = Programme and abstracts, the Seismological Society of Japan, 1998, 2, 09 Oct. 1998
Japanese

Temporal Seismic and GPS Observations around the Maruyama Volcano, Central Hokkaido(1995-1997).
TAKAHASHI HIROAKI, ICHIYANAGI MASAYOSHI, KASAHARA MINORU, 北海道大学地球物理学研究報告, 61, 179, 188, Mar. 1998
北海道大学大学院理学研究科地球惑星科学専攻（地球物理学）, Japanese

Far-Eastern GPS Network for detection of the Okhotsk Plate motion　　　　　　　　　　　　　　　
Takahashi, H, M. Kasahara, F. Kimata, S. Miura, T. Kato, K. Heki, N. Vasilenko, A. Ivashchenko, V. Bahtiarov, V. Levin, E. Gordeev, M. Gerasimenko, F. Korchagin, Proceeding of the Current Crustal Movement and Hazard Reduction in East Asia and South-East Asia, Wuhan, China, 1, 8, 1998, [Lead author]
Takahashi, H., M. Kasahara, F. Kimata, S. Miura, T. Kato, K. Heki, N. Vasilenko, A. Ivashchenko, V. Bahtiarov, V. Levin, E. Gordeev, M. Gerasimenko and F. Korchagin: "Far-Eastern GPS Network for detection of the okhotsk Plate motion", Proceeding of the Current Crustal Movement and Hazard Reduction in East Asia and South-East Asia, Wuhan, China,1-8(1998)., English

Relation between the Crustal Deformation Detected by GPS and the Earthquake Swarm around the Tokachi-Maruyama Volcano, Central Hokkaido
高橋 浩晃, 笠原 稔, 一柳 昌義, 本谷 義信, 北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University, 59, 0, 163, 176, 25 Mar. 1996
北海道大学理学部地球物理学教室, Japanese

Urgent joint observation of aftershocks of the 1995 Hyogo-ken Nanbu Earthquake
N Hirata, S Ohmi, S Sakai, K Katsumata, S Matsumoto, T Takanami, A Yamamoto, T Iidaka, T Urabe, M Sekine, T Ooida, F Yamazaki, H Katao, Y Umeda, M Nakamura, N Seto, T Matsushima, H Shimizu, H Takahashi, M Kosuga, M Watanabe, T Kawakami, Y Oku, K Tsumura, K Sasaki, H Togashi, A Hasemi, T Nishimura, K Nida, H Nakahara, S Ito, K Yoshimoto, K Shiomi, T Okada, S Aoki, N Tsumura, K Watanabe, GF Rocco, A Ito, H Hagiwara, Ogino, I, S Hashimoto, K Sakai, M Kobayashi, T Haneda, R Miura, K Miura, S Tsukada, K Uehira, T Yoshihara, T Okuda, R Shichi, M Nakamura, N Fujii, M Yamada, H Watanabe, K Ito, K Nishigami, T Shibutani, K Onoue, M Koizumi, S Matsuo, K Matsumura, H Wada, Y Fujita, Y Hiramatsu, M Nakamura, H Horikawa, Y Nakamura, H Negishi, A Yamazaki, G Besana, S Maruyama, Y Fujiwara, K Obana, A Ohigashi, A Motoki, M Hirata, Y Shimada, H Nemoto, M Yamaoka, A Yamada, Y Kase, K Taniguchi, S Kimura, K Umakoshi, K Uchida, S Hirano, JOURNAL OF PHYSICS OF THE EARTH, 44, 4, 317, 328, 1996
A disastrous earthquake with a magnitude of 7.2 hit the southern part of Hyogo Prefecture on January 17, 1995. The mainshock was located on an active fault of the Arima-Takatsuki-Rokko fault system. Its focal mechanism was consistent with a right-lateral strike-slip fault trending N40 degrees E. Three days after the occurrence of the mainshock, we started to install a highly dense seismic array in and around the fault area of the quake. Two permanent regional seismic networks of more than 30 stations covered the entire area of 200 km x 200 km. The temporarily installed array of 27 stations spanned the fault area of 15 km x 50 km. All data were telemetered to a temporary observation center at Uji. We located about 3,100 aftershocks in real time for 1 month using an internet connection between seismic networks. The aftershock area extended 70 km trending northeast to southwest. Hypocenters determined by the network were delivered automatically through the Internet. We found that the aftershock distribution was heterogeneous in space and time: seven clusters of hypocenters were identified and temporary variation in the rate of occurrence of aftershocks had a periodic component with periods of a half of day, 1 day, and 3 days, that are superimposed on decaying of the rate following Omori's law., CENTER ACADEMIC PUBL JAPAN, English

Earthquake off the southwest of Hokkaido and tidal waves.Tidal waves caused by the earthquake off the southwest of Hokkaido.From Otaru to Rebunto Island.
後藤章夫, 高橋浩晃, 宇津木充, 小野忍, 西田泰典, 大島弘光, 笠原稔, 竹中博士, 斉田智治, 月刊海洋, Gogai 7, 153, 158, Sep. 1994
Japanese

A Field Survey of Tsunami Generated by the Hokkaido-Nansei-Oki Earthquake. From Otaru to Rebun Island.
後藤章夫, 高橋浩晃, 宇津木充, 小野忍, 西田泰典, 大島弘光, 笠原稔, 竹中博士, 斉田智治, 日本地震学会秋季大会講演予稿集, 1993, 1993

ロシア極東・シベリアを知るための70章
服部, 倫卓, 吉田, 睦, カムチャツカと千島列島の火山
明石書店, May 2024, 9784750354682, 380p, 図版 [2] p, Japanese, [Contributor]

地震による地すべり災害－2018年北海道胆振東部地震―
高橋浩晃, 1.1 地震学的・測地学的な概要
北海道大学出版会, Sep. 2020, 12272037, [Contributor]

北海道自然探検 ジオサイト107の旅　　　　　　　　　　　　　　　
高橋 浩晃
May 2016, [Contributor]

北海道の地震と津波　　　　　　　　　　　　　　　
高橋 浩晃
北海道新聞, 2012, [Contributor]

日本地方地質誌北海道地方　　　　　　　　　　　　　　　
朝倉書店, 2010, [Contributor]

Crustal deformation in the northwestern Pacific region over the recent quarter century by regional GNSS data　　　　　　　　　　　　　　　
Takahashi H, Y. Ishida, M. Ohzono, G. Meng, W.Wu, N. Shestakov
Geodynamical processes and natural hazards, Yuzhno-Sakhalinsk, Russia, 09 Sep. 2021, English, Invited oral presentation
06 Sep. 2021 - 10 Sep. 2021, [Invited]

Preparedness for a impending supergiant earthquake and tsunami in southern Kuril trench
Hiroaki Takahashi
Geodynamical processes and natural hazards, Yuzhno-Sakhalinsk, Russia, 09 Sep. 2021, English, Public discourse
30644178, [Invited]

Estimation of postseismic effects of 2013 Okhotsk Sea Mw8.3 deep-focus earthquake
Nechaev G、Ni. Shestakov, H, Takahashi, E. Lialiushko
地球惑星科学連合大会, 06 Jun. 2021, English, Poster presentation
13225698

GNSS-A観測に基づく千島海溝根室沖における海底地殻変動の予備的結果　　　　　　　　　　　　　　　
太田雄策, 木戸元之, 本荘千枝, 木村友季保, 佐藤真樹子, 鈴木秀市, 東龍介, 大園真子, 青田裕樹, 高橋浩晃, 富田史章, 飯沼卓史, 篠原雅尚, 日野亮太
地球惑星科学連合大会, 03 Jun. 2021, Japanese, Oral presentation

Ionospheric effects caused by June 11-16, 2009 Sarychev Peak volcano eruption　　　　　　　　　　　　　　　
Shestakov N, A. Orlykovskii, N. Perevalova, N. Titkov, D. Chebrov, M. Ohzono, H.Takahashi, E. Lialiushk
地球惑星科学連合大会, 03 Jun. 2021, English, Oral presentation

陸域 GEONETによる北海道根室沖のプレート間固 着推定の限界と新設 GNSS-A観測点による推定範 囲の検討　　　　　　　　　　　　　　　
青田裕樹, 大園真子, 高橋浩晃, 太田雄策
日本地震学会秋季講演会, 31 Oct. 2020, Oral presentation

2018年北海道胆振地震の全体像と日本の地震環境　　　　　　　　　　　　　　　
高橋 浩晃
砂防学会シンポジウム, 07 Oct. 2019, Japanese, Keynote oral presentation
[Invited], [Domestic Conference]

北海道胆振東部地震の地震学的特徴　　　　　　　　　　　　　　　
高橋 浩晃
応用地質学会北海道支部 平成30年北海道胆振東部地震災害調査合同報告会, 27 Sep. 2019, Japanese, Invited oral presentation
[Invited], [Domestic Conference]

平成30年北海道胆振東部地震とその災害に関する総合調査　　　　　　　　　　　　　　　
高橋 浩晃
自然災害科学総合シンポジウム, 11 Sep. 2019, Japanese, Invited oral presentation
[Invited], [Domestic Conference]

2018年北海道胆振東部地震における地下水位の変化　　　　　　　　　　　　　　　
柴田智郎, 高橋良, 高橋浩晃, 鹿児島渉悟, 佐野有司, Pinti Daniele
JpGU, 30 May 2019, Japanese, Oral presentation
[Domestic Conference]

Preliminary result of continuous observation with an iGrav superconducting gravimeter at the Teshikaga observatory, eastern Hokkaido, Japan　　　　　　　　　　　　　　　
名和一成, 高橋浩晃, 大園真子, 岡田和見, 山口照寛, 岡大輔, 岡崎紀俊, 本多亮, 池田博
JpGU, 29 May 2019, Japanese, Oral presentation
[Domestic Conference]

The 2018 Hokkaido Eastern Iburi earthquake (MJMA = 6.7) was triggered by a strike-slip faulting in a stepover segment: Insights from the aftershock distribution and the focal mechanism solution of the mainshock　　　　　　　　　　　　　　　
勝俣啓, 大園真子, 青山裕, 田中良, 高田真秀, 一柳昌義, 山口照寛, 岡田和見, 高橋浩晃, 酒井慎一, 松本聡, 岡田知己, 松澤暢, 平野舟一郎, 寺川寿子, 堀川信一郎, 小菅正裕, 片尾浩, 飯尾能久, 長岡愛理, 津村紀子, 上野友岳, 年北海道胆振東部地震, 合同余震観測グループ
JpGU, 28 May 2019, Japanese, Oral presentation
[Domestic Conference]

Aftershock activity of the 2018 Hokkaido Eastern Iburi earthquake (MJMA 6.7) determined using the regional seismic network　　　　　　　　　　　　　　　
M. Ichiyanagi, K. Katsumata, M. Takada, T. Yamaguchi, M. Ohzono, K. Okada, H. Aoyama, R. Tanaka, H. Takahashi
GEODYNAMICAL PROCESSES AND NATURAL HAZARDS, 28 May 2019, English, Poster presentation
[International presentation]

Seismic refraction and wide-angle reflection experiment in southern Kyushu, Japan: (3) the 2018 exploration report　　　　　　　　　　　　　　　
宮町宏樹, 高橋浩晃, 青山裕, 大園真子, 椎名高裕, 髙田真秀, 一柳昌義, 山口照寛, 薄田悠樹, 齊藤一真, 伊藤ちひろ, 村井芳夫, 中垣達也, 筒井智樹, 竹井瑠一, 多田悠也, 山本希, 平原聡, 中山貴史, 東龍介, 鈴木秀市, 佐藤利典, 蔵下英司, 安藤美和子, 田中伸一, 池澤賢志, 山田知朗, 中東和夫, 前田裕太, 堀川信一郎, 松廣健二郎, 奥田隆, 辻修平, 十川直樹, 片尾浩, 澁谷拓郎, 三浦勉, 中川潤, 米田格, 為栗健, 瀧下恒星, 仲井一穂, 山下裕亮, 松島健, 内田和也, 宮町凛太郎, 八木原寛, 平野舟一郎, 久保武史, 坂尾健有
JpGU, 27 May 2019, Japanese, Poster presentation
[Domestic Conference]

Exploration of the velocity structure model in the Mukawa town, damaged area during the 2018 Hokkaido eastern Iburi earthquake　　　　　　　　　　　　　　　
重藤迪子, 高井伸雄, 堀田淳, 野本真吾, 前田宜浩, 高橋浩晃, 一柳昌義, 山中浩明, 地元孝輔, 津野靖士, 是永将宏, 山田伸之
JpGU, 27 May 2019, Japanese, Poster presentation
[Domestic Conference]

On application of GNSS-techniques for early tsunami warning in the Sea of Japan　　　　　　　　　　　　　　　
G Nechaev, N. Shestakov, H. Takahashi, M. Ohzono
JpGU, 27 May 2019, English, Oral presentation
[International presentation]

Regional and long-term deformation field due to subduction processes in northeastern Asia.　　　　　　　　　　　　　　　
H. Takahashi, M. Ohzono, C. Ito, N. Shestakov, M. Gerasimenko, N. Vasilenko, A. Prytkov, G. Meng
GEODYNAMICAL PROCESSES AND NATURAL HAZARDS, 27 May 2019, English, Oral presentation
[International presentation]

Post-seismic deformation of 2016 Kumamoto Earthquake by continuous GNSS network (3)　　　　　　　　　　　　　　　
中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見
JpGU, 26 May 2019, Japanese, Poster presentation
[Domestic Conference]

One cause of the strong ground motion characteristics in Mukawa town during the 2018 Hokkaido eastern Iburi earthquake　　　　　　　　　　　　　　　
高井伸雄, 重藤迪子, 前田宜浩, 一柳昌義, 高橋浩晃
JpGU, 26 May 2019, Japanese, Oral presentation
[Domestic Conference]

陸域GNSSデータによる釧路・根室沖の簡易的なプレート間固着の推定　　　　　　　　　　　　　　　
青田裕樹, 大園真子, 富田史章, 高橋浩晃
JpGU, 26 May 2019, Japanese, Poster presentation
[Domestic Conference]

北海道北部における衝突帯位置と収束速度の推定　　　　　　　　　　　　　　　
伊藤ちひろ, 高橋浩晃, 大園真子
JpGU, 26 May 2019, Japanese, Poster presentation
[Domestic Conference]

日本の地震防災体制と千島海溝の超巨大地震津波への備え　　　　　　　　　　　　　　　
高橋 浩晃
一般社団法人北海道産学官研究フォーラム, 16 May 2019, Public discourse
[Invited]

平成30年北海道東部地震と残された課題　　　　　　　　　　　　　　　
高橋 浩晃
北海道立総合研究機構環境・地質研究本部 調査研究成果発表会, 13 May 2019, Invited oral presentation
[Invited]

北海道の地震津波噴火の災害史　　　　　　　　　　　　　　　
高橋 浩晃
北海道考古学会研究大会・総会, 11 May 2019, Keynote oral presentation
[Invited]

地震発生のメカニズムと被害状況　　　　　　　　　　　　　　　
高橋 浩晃
電気学会電力・エネルギー部門 公開シンポジウム 北海道胆振東部地震で発生したブラックアウトを考える ～今回の現象と社会的影響を踏まえ，その教訓をどう活かすか～, 19 Mar. 2019, Japanese, Nominated symposium
[Invited], [Domestic Conference]

Tectonics in Hokkaido and the 2018 Eastern Iburi Earthquake　　　　　　　　　　　　　　　
TAKAHASHI Hiroaki
JSED Muroran IT, 01 Mar. 2019, Public discourse
[Invited]

北海道胆振東部地震と災害報道　　　　　　　　　　　　　　　
高橋 浩晃
北海道災害情報研究会, 21 Nov. 2018, Japanese, Media report
[Invited], [Domestic Conference]

CenterPoint RTX positioning with gravity survey for geothermal exploration in Japan　　　　　　　　　　　　　　　
TAKAHASHI Hiroaki
Trimble Dimension 2018, 05 Nov. 2018, English, Public discourse
[Invited], [International presentation]

水蒸気噴火を地殻変動データから読む～北海道雌阿寒岳　　　　　　　　　　　　　　　
高橋 浩晃
山梨県富士山科学研究所国際シンポジウム, 08 Oct. 2018, Japanese, Public discourse
[Invited], [Domestic Conference]

Seismic refraction and wide-angle reflection experiment in southern Kyushu, Japan: (1) the 2017 exploration report　　　　　　　　　　　　　　　
宮町宏樹, 高橋浩晃, 青山裕, 椎名高裕, 髙田真秀, 一柳昌義, 山口照寛, 小野夏生, 齊藤一真, 伊藤ちひろ, 村井芳夫, 筒井智樹, 井上雄介, 竹井瑠一, 山本希, 平原聡, 中山貴史, 日野亮太, 東龍介, 大友周平, 蔵下英司, 岩崎貴哉, 篠原雅尚, 山田知朗, 阿部英二, 中東和夫, 渡辺俊樹, 前田裕太, 堀川信一郎, 奥田隆, 辻修平, 長谷川大真, 片尾浩, 澁谷拓郎, 三浦勉, 中川潤, 加藤慎也, 山下裕亮, 松島健, 磯田謙心, Agnis TRIAHADINI, 手操佳子, 宮町凜太郎, 清水洋, 小林励司, 仲井一穂, 早田正和, 八木原寛, 平野 舟一郎
日本地球惑星科学連合2018年大会, May 2018, Japanese, Oral presentation
[Domestic Conference]

Post-seismic deformation of 2016 Kumamoto Earthquake by continuous GNSS network (2)　　　　　　　　　　　　　　　
中尾茂, 松島健, 田部井隆雄, 大久保慎人, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見
日本地球惑星科学連合2018年大会, May 2018, Japanese, Poster presentation
[Domestic Conference]

サハリン南部，北海道北部におけるアムールプレート衝突帯収束速度の推定　　　　　　　　　　　　　　　
伊藤 ちひろ, 高橋浩晃, 大園真子, ワシレンコ ニコライ, プリトコフ アレキサンダー
日本地球惑星科学連合2018年大会, May 2018, Japanese, Oral presentation
[Domestic Conference]

Dynamic strain and induced earthquakes due to the 2016 Kumamoto earthquake (M W 7.0), Kyushu, Japan　　　　　　　　　　　　　　　
Saito K, H. Takahashi, M. Ohzono
4th ICCE, the International Conference for the Decade Memory of the Wenchuan Earthquake, May 2018, English, Oral presentation
[International presentation]

Convergence velocity between Amurian plate and North American Plate estimated by GNSS at northern part of Hokkaido, Japan　　　　　　　　　　　　　　　
Ito C, H. Takahashi, M. Ohzono, N. Vasilenko, A. Prytkov
4th ICCE, the International Conference for the Decade Memory of the Wenchuan Earthquake, May 2018, English, Oral presentation
[International presentation]

The effect of large postseismic relaxation around northeast Asia　　　　　　　　　　　　　　　
Ohzono M, H. Takahashi, N. Shestakov, M. Gerasimenko, G. Meng
4th ICCE, the International Conference for the Decade Memory of the Wenchuan Earthquake, May 2018, English, Oral presentation
[International presentation]

Impact on continental deformation field in NE Asia due to subduction great earthquakes　　　　　　　　　　　　　　　
TAKAHASHI H, M. Ohzono, C. Ito, N, Shestakov N, M. Gerasimenko, N. Vasilenko, A. Prytkov, G. Meng
4th ICCE, the International Conference for the Decade Memory of the Wenchuan Earthquake, May 2018, English, Invited oral presentation
[Invited], [International presentation]

Seismic refraction and wide-angle reflection experiment in and around the Aira caldera (2) Preliminary results and the 2018 exploration plan
Miyamachi H., Ito C., Murai Y., Tsutsui T., Inoue Y., Takei R., Yamamoto M., Hirahara S., Nakayama T., Azuma R., Otomo S., Takahashi H., Hino R., Abe E., Kurashimo E., Iwasaki T., Shinohara M., Yamada T., Nakahigashi K., Watanabe T., Maeda Y., Horikawa S., Aoyama H., Okuda T., Tsuji S., Hasegawa D., Katao H., Shibutani T., Miura T., Nakagawa J., Kato S., Yamashita Y., Matsushima T., Shiina T., Teguri Y., Miyamachi R., Triahadini A., Isoda K., Shimizu H., Kobayashi R., Soda M., Nakai K., Yakiwara H., Hirano S., Takada M., Tanaka Y., Kawasaki S., Sato N., Ichiyanagi M., Yamaguchi T., Ono N., Saito K.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2018, The Volcanological Society of Japan, Japanese
2018 - 2018

2016年熊本地震後のGNSSによる余効変動の観測(2)
中尾茂, 松島健, 田部井隆雄, 山品匡史, 大倉敬宏, 西村卓也, 澁谷拓郎, 寺石眞弘, 伊藤武男, 鷺谷威, 松廣健二郎, 加藤照之, 福田淳一, 渡邉篤志, 三浦哲, 太田雄策, 出町知嗣, 高橋浩晃, 大園真子, 山口照寛, 岡田和見
日本地震学会秋季大会講演予稿集(CD-ROM), 06 Oct. 2017, Japanese
06 Oct. 2017 - 06 Oct. 2017

海溝型地震及び地震間固着が大陸内部の地殻変動場に与える影響―アムールプレート運動の再評価へ向けて―　　　　　　　　　　　　　　　
高橋浩晃, 大園真子, 中尾茂, SHESTAKOV N, GERASIMENKO M, VASILENKO N, PRYTKOV A, BYKOV V, LUNEVA M, GORDEEV E
日本測地学会講演会要旨, Oct. 2012, Japanese

屈斜路カルデラ周辺における稠密GPS観測　　　　　　　　　　　　　　　
大園真子, 高橋浩晃, 一柳昌義, 山口照寛, 眞城亮成, 篠原大地, 湊宏司
日本測地学会講演会要旨, Oct. 2012, Japanese

1m長および2m長伸縮計の動作特性　　　　　　　　　　　　　　　
笠原稔, 山口照寛, 高橋浩晃
日本測地学会講演会要旨, Oct. 2012, Japanese

極東ロシア広帯域地震観測網による微動記録の解析　　　　　　　　　　　　　　　
前田宜浩, 高橋浩晃, 一柳昌義, 宮町宏樹, 平野舟一郎, LEVIN Yury, VALENTIN Mikhaylov
日本地震学会秋季大会講演予稿集, 01 Oct. 2012, Japanese

日本列島太平洋側海溝型巨大地震と地震間固着がアジア北東域のテクトニクスに与える影響　　　　　　　　　　　　　　　
高橋浩晃, 大園真子, 中尾茂, SHESTAKOV N, GERASIMENKO M, VASILENKO N, PRYTKOV A, BYKOV V, LUNEVA M, GORDEEV E
日本地震学会秋季大会講演予稿集, 01 Oct. 2012, Japanese

2011年東北地方太平洋沖地震以後に発生した北海道の内陸の地震活動　　　　　　　　　　　　　　　
一柳昌義, 山口照寛, 東龍介, 高田真秀, 高橋浩晃, 岡崎紀俊, 大園真子, 高橋良, 黒井和典, 眞城亮成, 山田卓司, 勝俣啓, 谷岡勇市郎, 笠原稔
日本地震学会秋季大会講演予稿集, 01 Oct. 2012, Japanese

石狩低地東縁断層帯とその周辺における地震活動及び浅部地下構造　　　　　　　　　　　　　　　
一柳昌義, 高橋浩晃, 高田真秀, 山口照寛, 前田宜浩, 本多亮, 河野裕希, 岡山宗夫, 橋本武志, 青山裕, 笠原稔
日本地震学会秋季大会講演予稿集, 01 Oct. 2012, Japanese

ひずみ計を用いたMw即時推定手法の開発(その2)　　　　　　　　　　　　　　　
眞城亮成, 高橋浩晃
日本地震学会秋季大会講演予稿集, 01 Oct. 2012, Japanese

カムチャッカ・クリチェフスカヤ火山における高サンプリング傾斜変動観測　　　　　　　　　　　　　　　
松島健, 高橋浩晃, 青山裕, 中川光弘, 宮町宏樹, 後藤章夫, SERGEY Serovetnikov, YAROSLAV Muravyev, EVGENY Gordeev
日本火山学会講演予稿集, 2012, Japanese

霧島山2011年噴火前のマグマ蓄積の開始時に何があったのか　　　　　　　　　　　　　　　
中尾茂, 森田裕一, 後藤和彦, 八木原寛, 平野舟一郎, 及川純, 上田英樹, 小園誠史, 平田安廣, 高橋浩晃, 一柳昌義, 太田雄策, 松島健, 井口正人
日本火山学会講演予稿集, 2012, Japanese

屈斜路カルデラの地下温度構造　　　　　　　　　　　　　　　
秋田藤夫, 岡崎紀俊, 高橋浩晃
日本温泉科学会大会講演要旨集, 2012, Japanese

GEONETデータを用いた北海道におけるひずみの時空間分布　　　　　　　　　　　　　　　
大園真子, 高橋浩晃
日本測地学会講演会要旨, Oct. 2011, Japanese

十勝岳火口周辺の地殻変動に伴う重力変化　　　　　　　　　　　　　　　
岡崎紀俊, 廣瀬亘, 高橋良, 高橋浩晃, 一柳昌義, 本多亮
日本火山学会講演予稿集, 2011, Japanese

霧島新燃岳2011年1月26日噴火前後の地殻変動　　　　　　　　　　　　　　　
中尾茂, 森田裕一, 後藤和彦, 八木原寛, 平野舟一郎, 及川純, 上田英樹, 小園誠史, 平田安廣, 高橋浩晃, 一柳昌義, 太田雄策, 松島健, 井口正人
日本火山学会講演予稿集, 2011, Japanese

「雌阿寒火山を知る」ための取り組み―雌阿寒火山塾―　　　　　　　　　　　　　　　
廣瀬亘, 岡崎紀俊, 石丸聡, 野中祐子, 高橋浩晃, 笠原稔
日本火山学会講演予稿集, 2011, Japanese

雌阿寒岳の浅部群発地震活動に先行した深部収縮と低周波地震活動　　　　　　　　　　　　　　　
高橋浩晃, 山口照寛, 柴田智郎, 岡崎紀俊, 宮村淳一
日本火山学会講演予稿集, 2011, Japanese

釧路沖の中規模繰り返し地震活動　　　　　　　　　　　　　　　
佐鯉央教, 松山輝雄, 平山達也, 山崎一郎, 山本剛靖, 一柳昌義, 高橋浩晃
日本地震学会秋季大会講演予稿集, 01 Oct. 2010, Japanese

広島市と東広島市境界付近の地殻最下部で発生している低周波でない「普通」の地震について　　　　　　　　　　　　　　　
高橋浩晃, 山田卓司
日本地震学会秋季大会講演予稿集, 01 Oct. 2010, Japanese

ひずみ計で観測された2009年サモア・トンガ地震のS波到着前に見られるゆっくりとした変動　　　　　　　　　　　　　　　
高橋浩晃, 山口照寛, 三浦哲, 立花憲司, 出町和嗣
日本地震学会秋季大会講演予稿集, 01 Oct. 2010, Japanese

石狩低地東縁断層帯における地震活動及び地下構造(序報)　　　　　　　　　　　　　　　
一柳昌義, 高橋浩晃, 高田真秀, 山口照寛, 前田宜浩, 本多亮, 河野裕希, 岡山宗夫, 青山裕, 橋本武志, 笠原稔
日本地震学会秋季大会講演予稿集, 01 Oct. 2010, Japanese

GPSと干渉SARによる地殻変動検出結果の違いについての考察―2008年北海道雌阿寒岳小噴火での事例―　　　　　　　　　　　　　　　
河野裕希, 小澤拓, 高橋浩晃, 中尾茂, 岡崎紀俊, 一柳昌義, 及川太美夫
日本測地学会講演会要旨, 2010, Japanese

地殻変動データベース―2007年からの改良　　　　　　　　　　　　　　　
山口照寛, 笠原稔, 高橋浩晃, 岡山宗夫, 高田真秀, 一柳昌義
日本測地学会講演会要旨, 2010, Japanese

GPS観測と干渉SARから得られた北海道雌阿寒岳2008年小規模噴火に伴った地殻変動についての考察　　　　　　　　　　　　　　　
河野裕希, 小澤拓, 高橋浩晃, 中尾茂, 岡崎紀俊, 一柳昌義, 及川太美夫
日本火山学会講演予稿集, 2010, Japanese

日本列島における深部低周波地震の発生状況　　　　　　　　　　　　　　　
高橋浩晃, 宮村淳一
日本地震学会秋季大会講演予稿集, 01 Oct. 2009, Japanese

日本列島における深部低周波地震の発生状況　　　　　　　　　　　　　　　
高橋浩晃, 宮村淳一
日本火山学会講演予稿集, 2009, Japanese

2008年岩手・宮城内陸地震(M7.2)に伴った地震時・地震後地殻変動　　　　　　　　　　　　　　　
三浦哲, 太田雄策, 大園真子, 飯沼卓史, 立花憲司, 植木貞人, 高塚晃太, 宮尾佳世, 佐藤俊也, 対馬弘晃, 高橋浩晃, 山口照寛, 笠原稔, 鷺谷威, 小澤和浩, 福田真人, 朝日友香, 松島健, 中元真美, 山下裕亮, 中尾茂
日本地震学会秋季大会講演予稿集, 01 Nov. 2008, Japanese

2008年岩手・宮城内陸地震震源断層上端近傍での小アレイによる余震観測　　　　　　　　　　　　　　　
笠原稔, 高橋浩晃, 山口照寛, 前田宜浩, 高田真秀, 一柳昌義
日本地震学会秋季大会講演予稿集, 01 Nov. 2008, Japanese

稠密GPS観測網による2008年岩手・宮城内陸地震の余効変動の時空間変化推定　　　　　　　　　　　　　　　
飯沼卓史, 大園真子, 太田雄策, 三浦哲, 植木貞人, 高塚晃多, 対馬弘晃, 立花憲司, 松島健, 中元真美, 山下裕亮, 鷺谷威, 小澤和浩, 福田真人, 朝日友香, 笠原稔, 高橋浩晃, 山口照寛, 中尾茂
日本測地学会講演会要旨, Oct. 2008, Japanese

稠密GPS観測網による2007年中越沖地震の余効変動観測 その2 余効変動の時空間変化推定　　　　　　　　　　　　　　　
飯沼卓史, 太田雄策, 三浦哲, 立花憲司, 長谷川昭, 宮尾佳世, 松島健, 平尾暁彦, 高橋浩晃, 前田宜浩, 山口照寛, 高田真秀, 宮崎真一, 岩國真紀子, 落唯史, 鷺谷威, 伊藤武男, MEILANO Irwan, 道家涼介, 竹内章
日本測地学会講演会要旨, Oct. 2007, Japanese

稠密GPS観測網による2007年中越沖地震の余効変動観測 その1―GPS臨時観測の概要―　　　　　　　　　　　　　　　
太田雄策, 三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, MEILANO Irwan
日本測地学会講演会要旨, Oct. 2007, Japanese

稠密GPS連続観測による2007年能登半島地震の余効変動　　　　　　　　　　　　　　　
橋本学, 尾上謙介, 細善信, 福島洋, 大谷文夫, 中村佳重郎, 高橋浩晃, 笠原稔, 本多亮, 一柳昌義, 山口照寛, 前田宜浩, 道家涼介, 柳井啓広, 竹内章, 平松良浩
日本測地学会講演会要旨, Oct. 2007, Japanese

稠密GPS観測に基づく2007年中越沖地震の余効変動　　　　　　　　　　　　　　　
太田雄策, 三浦哲, 立花憲司, 飯沼卓史, 松島健, 高橋浩晃, 宮崎真一, 鷺谷威, 伊藤武男, 道家涼介, 竹内章, 宮尾佳世, 平尾暁彦, 前田宜浩, 山口照寛, 高田真秀, 岩國真紀子, 落唯史, MEILANO Irwan
日本地震学会秋季大会講演予稿集, 01 Oct. 2007, Japanese

2005年福岡県西方沖地震震源域内部のQ構造(2)　　　　　　　　　　　　　　　
松本聡, 植平賢司, 渡邉篤志, 後藤和彦, 飯尾能久, 平田直, 岡田知己, 高橋浩晃, 清水洋, 篠原雅尚, 金澤敏彦
日本地震学会秋季大会講演予稿集, 01 Oct. 2007, Japanese

稠密GPS連続観測による2007年能登半島地震の余効変動　　　　　　　　　　　　　　　
橋本学, 高橋浩晃, 笠原稔, 本多亮, 一柳昌義, 山口照寛, 前田宜浩, 道家涼介, 柳井啓広, 竹内章, 尾上謙介, 細善信, 福島洋, 大谷文夫, 中村佳重郎, 平松良浩
日本地震学会秋季大会講演予稿集, 01 Oct. 2007, Japanese

歪計を利用した即時マグニチュード推定システムの構築　　　　　　　　　　　　　　　
笠原稔一, 一柳昌義, 山口照寛, 岡山宗夫, 高田真秀, 高橋浩晃
日本地震学会秋季大会講演予稿集, 01 Oct. 2007, Japanese

2007年能登半島地震による強震動記録　　　　　　　　　　　　　　　
前田宜浩, 一柳昌義, 高橋浩晃, 本多亮, 山口照寛, 笠原稔, 笹谷努
日本地震学会秋季大会講演予稿集, 01 Oct. 2007, Japanese

北海道北部,問寒別断層帯の最新活動時期　　　　　　　　　　　　　　　
大津直, 田近淳, 新谷加代, 山本和哉, 宮脇明子, 宮脇理一郎, 高橋浩晃, 笠原稔
日本第四紀学会講演要旨集, 25 Aug. 2007, Japanese

2005年福岡県西方沖地震の余効変動モデルの再考　　　　　　　　　　　　　　　
中尾茂, 高橋浩晃, 松島健, 河野裕希, 一柳昌義
日本測地学会講演会要旨, Oct. 2006, Japanese

休止温泉ボーリング井を用いた高サンプリング地下水位観測　　　　　　　　　　　　　　　
高橋浩晃, 柴田智郎, 秋田藤夫, 高橋徹哉, 鈴木隆広, 岡崎紀俊, 山口照夏, 池田隆司, 笠原稔
日本地震学会秋季大会講演予稿集, 01 Oct. 2006, Japanese

噴火規模のリアルタイム推定の試み　　　　　　　　　　　　　　　
高橋浩晃, 岡崎紀俊, 上田英樹, 小原一成
日本火山学会講演予稿集, 2006, Japanese

連続および繰返しGPS観測による雌阿寒岳2006年の小噴火に伴う地殻変動　　　　　　　　　　　　　　　
岡崎紀俊, 高橋浩晃, 志賀透, 笠原稔
日本火山学会講演予稿集, 2006, Japanese

地震に関連した地下水の応答:2004年釧路沖の地震(M7.1)における地下水位の変化　　　　　　　　　　　　　　　
柴田智郎, 秋田藤夫, 岡崎紀俊, 松本則夫, 高橋浩晃, 池田隆司
日本地球化学会年会講演要旨集, 2006, Japanese

北海道雌阿寒岳2006年3月の小噴火　　　　　　　　　　　　　　　
廣瀬亘, 岡崎紀俊, 石丸聡, 田近淳, 中川光弘, 高橋浩晃, 長谷川健, 藤原伸也, 今野英慈, 永澤幸, 重野伸昭, 佐藤十一, 遠藤仁, 稲葉千秋, 佐々木寿
日本火山学会講演予稿集, 2006, Japanese

多機関GPS連続観測データの統合解析により見出された十勝岳の火山性地殻変動　　　　　　　　　　　　　　　
山田晃子, 村上亮, 宗包浩志, 瀉山弘明, 山里平, 横田崇, 岡崎紀俊, 田村慎, 高橋浩晃, 笠原稔
日本火山学会講演予稿集, 2006, Japanese

雌阿寒岳山麓における温泉および河川水の水質変化　　　　　　　　　　　　　　　
村山泰司, 岡崎紀俊, 荻野激, 田村慎, 高橋浩晃, 野中祐子
日本火山学会講演予稿集, 2006, Japanese

2004年留萌支庁南部の地震(M6.1)以降に継続している地殻変動について　　　　　　　　　　　　　　　
高橋浩晃, 山口照寛, 一柳昌義, 笠原稔
日本地震学会秋季大会講演予稿集, 01 Oct. 2005, Japanese

GPS観測より検出された2005年福岡県西方沖地震の余効変動　　　　　　　　　　　　　　　
河野裕希, 中尾茂, 松島健, 高橋浩晃, 一柳昌義
日本地震学会秋季大会講演予稿集, 01 Oct. 2005, Japanese

テレメータ観測網による2003年十勝沖地震の余震分布の検討‐三次元速度モデルを用いた数値実験による余震分布の精度の推定‐　　　　　　　　　　　　　　　
宮町宏樹, 一柳昌義, 岡山宗夫, 高田真秀, 山口照寛, 高橋浩晃, 笠原稔
日本地震学会秋季大会講演予稿集, 01 Oct. 2005, Japanese

福岡県西方沖地震震源域における三次元地震波速度構造　　　　　　　　　　　　　　　
堀美緒, 松本聡, 植平賢司, 岡田知己, 山田知朗, 飯尾能久, 篠原雅尚, 宮町宏樹, 高橋浩晃, 中東和夫, 渡辺篤志, 松島健, 松尾のり道, 金沢敏彦, 清水洋
日本地震学会秋季大会講演予稿集, 01 Oct. 2005, Japanese

2004年12月14日に発生した留萌支庁南部の地震(M_JMA6.1)の余震活動(その2)　　　　　　　　　　　　　　　
一柳昌義, 前田宜浩, 山口照寛, 高橋浩晃, 笹谷努, 笠原稔, 山本明彦
日本地震学会秋季大会講演予稿集, 01 Oct. 2005, Japanese

1874年ライマン一行のゆく手を阻んだ? 留萌地方初山別海岸の地震性地すべり　　　　　　　　　　　　　　　
田近淳, 田村慎, 川上源太郎, 浜田誠一, 高橋浩晃, 志村一夫
日本地質学会学術大会講演要旨, 10 Sep. 2005, Japanese

地殻変動から推定される有珠山の噴火過程　　　　　　　　　　　　　　　
岡崎紀俊, 高橋浩晃, 中尾茂, 笠原稔
日本温泉科学会大会講演要旨集, Sep. 2005, Japanese

北海道の温泉周辺で発生した特異な地震活動　　　　　　　　　　　　　　　
高橋浩晃
日本温泉科学会大会講演要旨集, Sep. 2005, Japanese

緊急地震観測による福岡県西方沖地震の特徴について　　　　　　　　　　　　　　　
清水洋, 高橋浩晃, 岡田知己, 金沢敏彦, 飯尾能久, 宮町宏樹, 松島健, 一柳昌義, 内田直希, 岩崎貴哉, 片尾浩, 後藤和彦, 松本聡, 平田直, 中尾茂, 植平賢司, 篠原雅尚, 八木原寛, 亀伸樹, 卜部卓, 松尾のり道, 山田知朗, 渡辺篤志, 中東和夫, ENESCU Bogdan, 内田和也, 橋本信一, 平野舟一郎, 八木健夫, 河野裕希, 上野友岳, 斉藤政城, 堀美緒
West Jpn NDIC News (Natural Disaster Inf Cent West Jpn), Jun. 2005, Japanese

ちゅう密GPS観測で得られた2003年十勝沖地震の余効変動とすべり分布　　　　　　　　　　　　　　　
高橋浩晃, 小山順二, 加藤照之, 中尾茂, 鷺谷威, 伊藤武男, 橋本学, 松島健, 岡崎紀俊
日本地震学会秋季大会講演予稿集, 01 Oct. 2004, Japanese

ちゅう密GPS観測で得られた2003年十勝沖地震の余効変動とすベリ分布　　　　　　　　　　　　　　　
高橋浩晃, 小山順二, 加藤照之, 中尾茂, 鷺谷威, 伊藤武男, 橋本学, 松島健, 岡崎紀俊
日本測地学会講演会要旨, 2004, Japanese

北大・サハリン間でのインターネットによるリアルタイム地震波形変換　　　　　　　　　　　　　　　
一柳昌義, 高橋浩晃, 笠原稔, SEN R S
日本地震学会秋季大会講演予稿集, 01 Nov. 2002, Japanese

GPSによる北海道駒ケ岳の地殻変動　　　　　　　　　　　　　　　
岩下里詩, 高橋浩晃, 笠原稔, 岡崎紀俊, 宮村淳一
日本火山学会講演予稿集, 22 Oct. 2002, Japanese

GPS連続観測によるカムチャッカ地域の地殻変動　　　　　　　　　　　　　　　
丸山保洋, 笠原稔, 高橋浩晃, GORDEEV E I, LEVIN V E, BAKHTIAROV V F
日本地震学会秋季大会講演予稿集, 15 Oct. 2001, Japanese

鳥取県西部地震震源域におけるちゅう密GPS観測(2周波観測) (文部科学省S)　　　　　　　　　　　　　　　
橋本学, 西村宗, 田部井隆雄, 田川繭子, 近添裕司, 石橋克彦, かけい楽麿, 高橋浩晃, 中野健秀
2000年10月鳥取県西部地震による災害に関する調査研究 平成12年度 No.12800013, 2001, Japanese

GPS観測による2000年有珠山噴火前後の地殻変動 1周波受信機による観測　　　　　　　　　　　　　　　
岡崎紀俊, 高橋浩晃, 笠原稔, 石丸聡, 森済
日本火山学会講演予稿集, 13 Sep. 2000, Japanese

GPS観測による2000年有珠山噴火前後の地殻変動 2周波受信機による観測　　　　　　　　　　　　　　　
高橋浩晃, 岡崎紀俊, 石丸聡, 森済, 中尾茂, 三浦哲, 松島健, 木股文昭, 笠原稔
日本火山学会講演予稿集, 13 Sep. 2000, Japanese

大雪山系山頂におけるGPS観測　　　　　　　　　　　　　　　
金曽貴之, 小山順二, 高橋浩晃
日本地震学会秋季大会講演予稿集, 09 Nov. 1999, Japanese

北海道北部・サハリン南部の地殻活動 アムールプレート収束帯　　　　　　　　　　　　　　　
高橋浩晃, 木股文昭, VASILENKO N, 笠原稔
日本測地学会講演会要旨, 09 Nov. 1999, Japanese

Deep, low frequency microearthquakes occurring in Hokkaido.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, MIYAMURA JUN'ICHI, GOKE KOJI
日本火山学会講演予稿集, Oct. 1998, Japanese

Amurian Plate Motion Detected From GPS Observation at Khabarovsk, Far Eastern Russia.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KASAHARA MINORU, SENO TETSUZO, KORCHAGIN F
日本測地学会講演会要旨, Oct. 1998, Japanese

Re-determination of the Movement of the Amurian Plate.　　　　　　　　　　　　　　　
HEKI KOSUKE, MIYAZAKI SHIN'ICHI, TAKAHASHI HIROAKI, KIMATA FUMIAKI, MIURA SATOSHI, SENO TETSUZO, VASILENKO N, KORCHAGIN F, AN G
日本測地学会講演会要旨, Oct. 1998, Japanese

Re-determination of the Movement of the Amurian Plate.　　　　　　　　　　　　　　　
HEKI KOSUKE, MIYAZAKI SHIN'ICHI, TAKAHASHI HIROAKI, KIMATA FUMIAKI, MIURA SATOSHI, SENO TETSUZO, VASILENKO N, KORCHAGIN F, AN G
日本地震学会秋季大会講演予稿集, Sep. 1998, Japanese

Far-Eastern GPS Network for detection of the Okhotsk Plate motion.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KIMATA FUMIAKI, MIURA SATOSHI, HEKI KOSUKE, KATO TERUYUKI, VASILENKO N, BAHTIAROV V, GORDEEV E, KORCHAGIN F
日本測地学会講演会要旨, Oct. 1997, Japanese

GPS observations around the seismic fault of the 1995 North-Sakhalin Earthquake (Mw=7.0). (1995-1997).　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KIMATA FUMIAKI, MIURA SATOSHI, IMANISHI MASAFUMI, VASILENKO N, IVASHCHENKO A, GORNOV P, KASAHARA MINORU
日本測地学会講演会要旨, Oct. 1997, Japanese

Seismic Activity at Karymsky Volcano in Kamchatka, August, 1996.　　　　　　　　　　　　　　　
MIYAMACHI HIROKI, OKAYAMA MUNEO, KASAHARA MINORU, TAKAHASHI HIROAKI, HIOKI KOSUKE, GORDEEV E I
地球惑星科学関連学会合同大会予稿集, Mar. 1997, Japanese

GPS observation of water vapor in volcanic plumes.　　　　　　　　　　　　　　　
HEKI KOSUKE, KASAHARA MINORU, TAKAHASHI HIROAKI, MAGUSKIN M A, LEVIN V E, BASHATIAROV V F
地球惑星科学関連学会合同大会予稿集, Mar. 1997, Japanese

Second Observation of Aftershocks and Crustal Deformation around the focal area of 1995 North-Sakhalin Earthquake (Mw=7.0).　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, ICHIYANAGI MASAYOSHI, KIMATA FUMIAKI, MIURA SATOSHI, KASAHARA MINORU, KIM C U, SEN R S, VASILENKO N, IVASHENCO A
地球惑星科学関連学会合同大会予稿集, Mar. 1997, Japanese

Far-Eastern GPS Network for the detection of Okhotsk and Amure Plate Motion. Preliminary Report.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, HEKI KOSUKE, KIMATA FUMIAKI, MIURA SATOSHI, KATO TERUYUKI, VASILENKO N, IVASHCHENKO A, GORDEEV F, GERASIMENKO M D
地球惑星科学関連学会合同大会予稿集, Mar. 1997, Japanese

Conducted in September 1996 at Miyakejima.　　　　　　　　　　　　　　　
MIKADA HITOSHI, WATANABE HIDEFUMI, OIKAWA JUN, KIMATA FUMIAKI, MIYAJIMA RIKIO, MATSUSHIMA TAKESHI, HORIUCHI MAKOTO, KARIYA SHIN'ICHI, TAKAHASHI HIROAKI
地球惑星科学関連学会合同大会予稿集, Mar. 1997, Japanese

High-Sampling Kinematic GPS Observation at the Karymsky Volcano, Kamchatka.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KASAHARA MINORU, HEKI KOSUKE, MAGUSKIN M A, LEVIN V E, BASHATIAROV V F
日本火山学会講演予稿集, Nov. 1996, Japanese

On the eruption of Karymsky of January, 1996 and temporal seismic and GPS observations.　　　　　　　　　　　　　　　
KASAHARA MINORU, TAKAHASHI HIROAKI, OKAYAMA MUNEO, MIYAMACHI HIROKI, HEKI KOSUKE, MAGUSKIN M, LEVIN V, BAHTIAROV V, GORDEEV E
日本火山学会講演予稿集, Nov. 1996, Japanese

Current Crustal Deformation around the Hidaka-Mountains detected by GPS(1992-1996).　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, ICHIYANAGI MASAYOSHI, MORIYA TAKEO, KASAHARA MINORU, KOJIN TOMOKO
日本測地学会講演会要旨, Oct. 1996, Japanese

Current Crustal Deformation around the Hidaka-Mountains detected by GPS (1992-1996).　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, ICHIYANAGI MASAYOSHI, MORIYA TAKEO, KASAHARA MINORU, KOJIN TOMOKO
日本地震学会秋季大会講演予稿集, Sep. 1996, Japanese

Crustal Deformation measured by GPS around the Maruyama Volcano in Central Hokkaido, Japan.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KASAHARA MINORU
地球惑星科学関連学会合同大会予稿集, Mar. 1996, Japanese

Crustal deformation related to the Matsumae earthquake swarm detected by GPS.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KASAHARA MINORU, KOSUGE MASAHIRO, TANAKA KAZUO
地球惑星科学関連学会合同大会予稿集, Mar. 1996, Japanese

Real-Time Kinematic GPS Observations in the Focal Region of Hyogoken-Nanbu Earthquake.　　　　　　　　　　　　　　　
HIRAHARA KAZURO, NAKANO TAKEHIDE, MATSUSHIMA TAKESHI, TAKAHASHI HIROAKI, MIURA SATOSHI, ICHIKAWA RYUICHI, TABEI TAKAO, KATO TERUYUKI, NAKAO SHIGERU
日本地震学会秋季大会講演予稿集, Sep. 1995, Japanese

Continuous GPS observation in Hokkaido. Jun. 1994-Jul. 1995.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KASAHARA MINORU
日本地震学会秋季大会講演予稿集, Sep. 1995, Japanese

Co-seismic deformation around the northern part of seismic fault of the 1995 North Sakhalin Great Earthquake.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, VASILENKO N, KIMATA FUMIAKI, KASAHARA MINORU, KIM C U, SENO TETSUZO, IVASHENKO A
日本地震学会秋季大会講演予稿集, Sep. 1995, Japanese

Crustal Deformation Survey by GPS in Kussyaro-Caldera.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KATSUMATA KEI, ICHIYANAGI MASAYOSHI, SUZUKI ATSUSHI, ASAI YASUHIRO, YAMADA KAZUO, KASAHARA MINORU
地球惑星科学関連学会合同大会予稿集, Mar. 1995, Japanese

Crustal Deformation in Hokkaido related to great Hokkaido Toho-Oki Earthquake of October 4, 1994 measured by GPS.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KATSUMATA KEI, SUZUKI ATSUSHI, YAMADA KAZUO, KASAHARA MINORU
地球惑星科学関連学会合同大会予稿集, Mar. 1995, Japanese

Crustal Deformation caused by the great Hokkaido Toho-Oki Earthquake of October 4, 1994, in Hokkaido measured by GPS.　　　　　　　　　　　　　　　
TAKAHASHI HIROAKI, KASAHARA MINORU, MIURA SATOSHI, TANAKA KAZUO
地震研究所研究集会GPS研究会(GPSシンポジウム1994)集録 平成4-6年度 日本学術会議測地学研究連絡委員会GPS検討会 測地学におけるGPSの高度利用に関する総合的研究 No.04302019, 1995, Japanese

Earthquake off the southwest of Hokkaido and tidal waves.Tidal waves caused by the earthquake off the southwest of Hokkaido.From Otaru to Rebunto Island.　　　　　　　　　　　　　　　
GOTO AKIO, TAKAHASHI HIROAKI, UTSUGI MITSURU, ONO SHINOBU, NISHIDA YASUNORI, OSHIMA HIROMITSU, KASAHARA MINORU, TAKENAKA HIROSHI, SAITA TOMOHARU
月刊海洋, Sep. 1994, Japanese

A Field Survey of Tsunami Generated by the Hokkaido-Nansei-Oki Earthquake. From Otaru to Rebun Island.　　　　　　　　　　　　　　　
GOTO AKIO, TAKAHASHI HIROAKI, UTSUGI MITSURU, ONO SHINOBU, NISHIDA YASUNORI, OSHIMA HIROMITSU, KASAHARA MINORU, TAKENAKA HIROSHI, SAITA TOMOHARU
日本地震学会秋季大会講演予稿集, Sep. 1993, Japanese

地球惑星科学のフロンティア　　　　　　　　　　　　　　　
北海道大学
Sep. 2017 - Present

現代地球惑星科学概論２　　　　　　　　　　　　　　　
北海道大学
Sep. 2020 - Mar. 2021

地震の科学と防災減災　　　　　　　　　　　　　　　
放送大学北海道学習センター
Nov. 2020 - Nov. 2020

教科教育法Ⅰ　　　　　　　　　　　　　　　
北海道大学
Apr. 2018 - Sep. 2018

固体地球科学　　　　　　　　　　　　　　　
山形大学
Nov. 2013 - Nov. 2013

地球計測特論　　　　　　　　　　　　　　　
北海道大学

地球計測実習　　　　　　　　　　　　　　　
北海道大学

Explore the slow earthquake in Kamchatka subduction zone
Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
Oct. 2020 - Mar. 2024
高橋 浩晃
昨年度に選定した傾斜計・広帯域地震計及び周辺機器が納入され試験観測を実施し性能確認を行った。観測システムは200V入力仕様で停電及び雷対策のためにトランスと充電器から機器に給電する方式とし、停電時でも１カ月程度はオペレーションが可能な電力容量を予定した。データロガーは広帯域地震計からのアナログ入力と傾斜計からのシリアル入力を同時に可能とするファームウエアを新たに開発した。観測点の選定をロシア側研究機関と進め、電力やインターネット、セキュリティの関係から、ペトロパブロフスクの海岸付近にある灯台敷地内と、約10km程度海岸から離れた地震観測所とした。傾斜計を設置するボアホール井戸の設計を実施し、掘削孔は10m程度の深度のポリ塩化ビニルケーシング100mmの密閉型完全防水とし、ケーシングの傾斜2度以内、ローラーコーンビットによる掘削を行った後、ケーシング周辺をセメントで充填する仕様書を作成した。ロシア側研究機関が選定した業者との仕様打ち合わせ及び工事価格調整を行い、見積書の発行を受け、随意契約による国際発注の手続きを進めた。また、観測機器の輸出手続きに必要な非該当証明等の手続きも進めた。2022年2月にロシアがウクライナに侵攻した関係で、外務省からロシアへ渡航中止勧告が出され、経済産業省から外国為替及び外国貿易法に基づきロシアへの輸出が役務取引を含め原則承認されないこととなったため、傾斜計用ボアホールの役務発注及び機器輸出の準備を中断した。今後の研究の進め方については、国の規制の動向を見つつ、既存データの利用等を含めた検討を行うこととした。
Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Hokkaido University, Principal investigator, 20KK0073

千島海溝の超巨大地震津波対策を支える災害総合知の創出
災害レジリエンス共創研究プロジェクト
Aug. 2022 - Mar. 2023
東北大学災害科学国際研究所

中国ロシア日本を統合するGNSS観測ネットワークで見る東アジア変動帯の全容
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Apr. 2019 - Mar. 2023
高橋 浩晃, 大園 真子, 田部井 隆雄, 中尾 茂
今年度も新型コロナウイルス感染拡大のため対面方式での研究打ち合わせが困難であったためオンライン形式で情報交換を実施して研究を行った。中国側及びロシア側共同研究者から解析ソフトウエアのパラメータ情報を取得するとともに、国土地理院が新たに開始したF5解析戦略の検討も実施した。解析は、中国国内の2000点を超える観測点のデータ解析を行っている中国側のパラメータで実施することとした。中国側からは、BerneseソフトウエアのプロセスであるPCFファイル及び利用するグローバル座標系の情報提供を受けた。また、解析速度の向上のため、北海道大学情報基盤センターのスーパーコンピューターを利用することとし、解析環境のセットアップを行った。解析では、中国側が利用しているグローバルなIGS観測点を共通観測点として、座標時系列の共通化を図ることで結果の妥当性検証を行えるようにしたほか、日本国内のGEONET観測点を入れることで、中国側の座標時系列との連結を図ることとし、中国側からは共通観測点の座標時系列データの提供を受けた。また、ロシアの観測点データとも、共通観測点を設けることで、適当な座標変換により統一座標系での速度ベクトルが導出出来る見込みであったが、紛争が開始されたため研究打ち合わせ及びデータの入手が困難となった。国土地理院のF5解析戦略による座標データについても、大陸側にある共通観測点の座標時系列を比較することにより、座標変換により統一座標系での速度ベクトル表示が行える可能性も示された。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, 19H01984

千島海溝南部超巨大地震の事前復興計画策定に向けたアクションリサーチ
共同研究プロジェクト
May 2020 - Mar. 2022
東北大学災害科学国際研究所, Principal investigator

Development of new helium gas sampling technique for crust fluid studyal
Grants-in-Aid for Scientific Research Challenging Research (Exploratory)
Jun. 2018 - Mar. 2021
TAKAHASHI HIROAKI
Helium gas isotopes might reflect crustal fluid migration characteristics for earthquake generation and volcanic activities. Helium gas sampling technique, however, has been not easy for common researchers. Feasibility test for easy sampling of helium gas isotopes was carried out. We develop a inexpensive and easy-to-operative gas sampling kit. The test samplings in high-temperature and acid wells at active volcanoes and seismic regions suggest its durability. A vacuum line for gas leak investigation was designed and manufactured. Gas leak test suggested there may be a leak due to the physical sealing degree of the sample kit. Test with stronger physical sealing sampler indicated only the adsorbed gas was exited inner the kit.
Japan Society for the Promotion of Science, Challenging Research (Exploratory), Hokkaido University, Principal investigator, 18K18777

Comprehensive study on the 2018 Hokkaido Eastern Iburi Earthquake and its disaster
Grants-in-Aid for Scientific Research Grant-in-Aid for Special Purposes
Oct. 2018 - Mar. 2019
Takahashi Hiroaki
Comprehensive investigation on the 2018 Hokkaido Eastern Iburi earthquake and its disaster was conducted. Mainshock rupture initiated at deepest part and major slip was occurred in 20-30km deep. Multiple simultaneous landslides in Atsuma town was induced by combination of strong ground shaking and weak sliding layer between pyroclastic fall deposit layers. Halloysite cray minerals was discovered in all sliding layers. Simulation suggested landslides might attack residential houses within 6 seconds. Observed peak ground motions in nearby area were larger than common distance attenuation model. Severe wooden house damage in Mukawa town was due to amplified seismic waves due to site effects. Sounding and boring investigation revealed filled low-density volcanic ash and higher groundwater level in liquefaction area. Electricity blackout caused severe damage in social and economic activities of Hokkaido. These scientific outcomes were explained to residents at public briefing session.
Japan Society for the Promotion of Science, Grant-in-Aid for Special Purposes, Hokkaido University, Principal investigator, 18K19952

アバチンスキー火山の都市型噴火災害軽減に向けた噴火様式予測の試み
ロシアとの共同研究（二国間共同研究）
Apr. 2017 - Mar. 2019
高橋 浩晃
日本学術振興会, Principal investigator, Competitive research funding

Development of rapid coseismic fault model estimation system based on the multiple geodetic data
Grants-in-Aid for Scientific Research
01 Apr. 2015 - 31 Mar. 2018
Ohta Yusaku
We developed the prototype system of rapid coseismic fault model estimation for the large earthquake whose magnitude is more than 7 based on real-time GNSS and strain meter. We showed the method for the high precision kinematic GNSS analysis and investigated the precision of kinematic GNSS time series using developed precise movable table for GNSS antenna. We also investigated the uncertainties estimation of the rapid coseismic fault model estimation using GNSS data based on MCMC approach. Furthermore, we improved the method for rapid coseismic fault model estimation based on borehole strain meter. Finally, we have started operation the prototype system of the distribution and its analysis of crustal deformation continuous observation data.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Tohoku University, 15H03713

Geodynamics in Far East
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Apr. 2013 - Mar. 2018
Takahashi Hiroaki, ICHIYANAGI Masayoshi, YAMAGUCHI Teruhiro, GORDEEV Evgeny, BYKOV Victor, GERASIMENKO Mikhail, SHESTAKOV Nikolay, VASILENKO Nikolay, PRYTKOV Alexandr, LEVIN Yuri, VALENTINE Mikhaylov, KOSTYLEV Dmitrii, CHEBROV Danila, SEROVETNIKOV Sergey
Seismic and GNSS observation had been carried out in northeastern Asia with Russian institutions. Significant regional post-seismic crustal deformation has been detected. Postseismic displacements exceeded co-seismic one in Prymorie stations. Detailed seismic tomographic image using broadband seismograms clearly detected seismic velocity structure beneath Japan Sea. Viscoelastic structure estimation using geodetic and seismic information was performed. Misfit between calculated and observed postseismic displacements might request to construct more complex structure. Our model allow to estimate regional postseismic signals due to historical past great earthquakes in Japan Islands. Estimated viscoelastic parameters had predicted great subduction earthquakes around Japan generated regional and long-term deformation in northeast Asia. This fact suggested current crustal deformation field in continent has been strongly affected by distant subduction earthquakes.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 25257204

General study on the 2016 Kumamoto earthquake and related activities
Grants-in-Aid for Scientific Research Grant-in-Aid for Special Purposes
Apr. 2016 - Mar. 2017
SHIMIZU Hiroshi, UTSUGI Mitsuru, UYESHIMA Makoto, WANG Gonghui, HAZARIKA Hemanta, YADA Toshihumi, TAKAHASHI Kazuo
A general study on the 2016 Kumamoto earthquake was conducted, and the features of seismic activity, crustal deformation, active faults, affects on volcanic activity and earthquake disasters were investigated. Although the 2016 Kumamoto earthquake was generated by a right-lateral strike-slip of the Futagawa-Hinagu fault system, our study revealed that the earthquake occurred on the several fault planes with complex geometry. The relationship between seismic hazards and subsurface structures was investigated and found that the excess pore-pressure of soil was a generating factor of the landslides at Aso caldera. Furthermore, our study indicated that the Kumamoto earthquake was characterized by the composite disasters in wide area, and showed their problems and countermeasures.
Japan Society for the Promotion of Science, Grant-in-Aid for Special Purposes, Kyushu University, 16H06298

深部低周波地震は地殻への水の供給と関係しているのか？
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Apr. 2015 - Mar. 2017
高橋 浩晃
地殻深部低周波地震の列島規模の発生状況について，第４紀火山・活火山・活断層・浅部地震活動・火山性地震などとの比較を試みた．1997年以降の発生数は全国で約19000個であり，2011年以前の年間発生数は1300個程度であったが，それ以降は800個程度に減少したことを発見した．
ほぼすべての活火山の周辺で活動が見られる．第４紀火山でも発生が認められ，宮城県の安達火山や北海道南部の銭亀など，特異な活動を示す火山においても活動が見られる．発生数が多いのは富士山・雌阿寒岳などであるが，定常的に火山活動が活発な浅間山では僅か14個であった．蔵王や八甲田では，火山性地震・微動の増加や膨張の検出などの浅部火山活動の活発化と同期した活動が見られた．噴火した御嶽山や霧島山新燃岳では同期する活動の変化は認められない．
活火山や第４紀火山以外でも発生が確認された．活断層では砺波平野断層帯・岩手青森県境の折爪断層帯・近畿地方の中央構造線・有馬高槻断層帯・京都西山断層帯などである．活断層はないが浅部地震活動が活発な北海道南部南茅部・北海道南富良野・福島県桧枝岐・栃木県足尾などの事例もある．これらの事実は，地殻深部低周波地震と浅部地震活動の関連性を示唆する．2016年6月16日に北海道函館市で発生した震度6弱（M5.3）の地震の震源域は，火山はないが以前から地殻深部低周波地震の発生が知られ，定常的に浅部群発地震活動が見られる地域である．北海道南西部で詳細な地震波トモグラフィー解析を実施した結果，地殻深部低周波地震が発生している深度は高Vp/Vsで流体の存在が示唆されること，浅部地殻は高Vpであることが明らかになった．
火山地域と非火山地域では，震源の深さ分布に大きな違いがあることを発見した．火山地域では深さ方向にある幅をもってブロードに分布しているのに対し，非火山地域ではモホ面付近に集中している．
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Hokkaido University, 15H01134

Study on viscoelastic structure and monitoring of global change by observation of uplifting and gravity in Alaska, US
Grants-in-Aid for Scientific Research
01 Apr. 2011 - 31 Mar. 2016
Miura Satoshi, SATO TADAHIRO, FUJIMOTO HIROMI, OHTA YUSAKU, MOTOYUKI SATO, TAKAHASHI HIROAKI, OKUBO SHUHEI, KAZAMA TAKAHITO, Jeff Freymueller, Chris Larsen, Max Kaufman
In order to study crustal uplifting and gravity change in southeastern Alaska, United States, we carried out continuous GPS and gravity measurements together with absolute gravity survey three times in the area. From the continuous GPS measurements, the maximum uplifting rate of 3 cm/year, which is consistent with the previous study, was derived. Since the continuous gravity measurements by a superconducting gravimeter demonstrated very small, almost no instrumental drift rate, we may be able to use the gravimeter complementing the absolute gravity survey. Gravity change rates obtained by the survey show -1 to -3 micro-gal/year, which is about a half of those for the period from 2006 to 2008. This discrepancy can be attributed to the effects of underground water and/or loading of precipitation.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), 23253003

GPS観測による日本海下粘弾性構造推定とアジア北東地域のテクトニクスの解明
ロシアとの共同研究（２国間）
Apr. 2013 - Mar. 2015
高橋 浩晃
日本学術振興会, Principal investigator, Competitive research funding

島弧型玄武岩質マグマ噴火のマグマ系と噴火機構解明のための日ロ共同研究　　　　　　　　　　　　　　　
科学研究費補助金(基盤研究(A))
Apr. 2010 - Mar. 2014
中川 光弘
日本学術振興会, Competitive research funding

Renewing of tectonic frame in northeastern Asia by geophysical observation data
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
2009 - 2012
TAKAHASHI Hiroaki, MIYAMACHI Hiroki, NAKAO Shigeru, YOMOGIDA Kiyoshi, YOSHIZAWA Kazunori, YOSHIMOTO Mitsuhiro, TANIOKA Yuichiro
Characteristics of crustal deformation due to Amur plate motion and seismological structure of crust and upper mantle in far eastern Russia, Japan Sea and northwestern Pacific had been clarified from original geophysical data from international GPS and seismological observation network operated by this research project. Clear coseismic and postseismic deformation associated with the 2011 M9.0 Tohoku earthquake was recognized. These facts suggested that geodynamic effects related to subdution process along Kuril, Japan trenches and Nankai trough should be examined for detection of Amur plate motion and building tectonic frame in northeastern Asia.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 21253005

札幌市受託研究
Apr. 2009 - Mar. 2010
高橋 浩晃
札幌市直下に発生する地震の調査, Principal investigator, Competitive research funding

Japan-Russia-USA joint research of volcanic activity, seismic activity and crustal deformation of Kuril arc
Grants-in-Aid for Scientific Research(基盤研究(A))
2005 - 2008
Mitsuhiro NAKAGAWA, 高橋 浩晃, 大場 武, 石川 剛志, 金子 隆之, Takeshi HASGIMOTO, 西村 裕一, 風早 康平, 石塚 吉浩, Hiroaki TAKAHASHI, Minoru KASAHARA, Yuichi NISHIMURA, Mitsuhiro YOSHIMOTO, Kohei KAZAHAYA, Yoshihiro ISHIZUKA, Takayuki KANEKO
日露米の3ケ国により南千島ウルップ島から北千島パラムシル島で、ビザ無し専門家交流により日露で色丹・国後・択捉島で、火山学的および古津波調査を実施した。その結果、千島列島の過去1万年間の火山噴火履歴と、主要な噴火の噴火様式および特に南千島での津波の発生間隔を検討した。特に火山活動では、9500～6500 年前および4000～1000年前にカムチャッカ～北海道まで大規模な噴火が頻発したこと、またマグマ組成の広域変化が基盤構造の差異と調和的であることを始めて指摘できた。
Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Coinvestigator not use grants, Competitive research funding, 17253002

Study on viscoelastic structure beneath Southeastern Alaska, United States through geodetic observation of crustal uplift Caused by deglaciation
Grants-in-Aid for Scientific Research(基盤研究(A))
2005 - 2008
Satoshi MIURA, Hiromi FUJIMOTO, Minoru KASAHARA, Hiroaki TAKAHASHI, Tadahiro SATO, Bunka SON, Yusaku OHTA, Takayuki SUGANO, Junichi OKUNO, Daisuke INAZU
本研究では,平成18～20年度に絶対重力測定を毎年実施した.測定結果を1987年の測定結果と比較したところ,過去約20 年の間米国アラスカ州南部において,4μgal/yearを超える速度で重力値が減少していることが明らかになった.このような高速の重力減少速度は,氷河融解に伴うものとしては,世界的にも例がない.この結果とアラスカ大学がこれまで実施してきたGPS観測による地殻上下変動は.氷河融解に伴う弾性・粘弾性変形モデルで良く説明できることがわかった
Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 東北大学, Coinvestigator not use grants, Competitive research funding, 17253003

Investigation of fine-structure of stagnant slab using by a new broad-band seismic network in the Far Eastern Siberia
Grants-in-Aid for Scientific Research(特定領域研究)
2004 - 2008
Minoru KASAHARA, Kiyoshi YOMOGIDA, Hiroki MIYAMACHI, Yuuichiro TANIOKA, Hiroaki TAKAHASHI, Kazunori YOSHIZAWA, Rak Se SEN, Vladimir BORMOTOV
潜り込んだ太平洋プレートのスタグナント(滞留)しているロシア極東地域に、8箇所の広帯域地震観測点の新設を目標に進めてきたが、3年目に完成し、さらに1箇所追加で、カムチャッカに設置できた。観測は、ロシア科学アカデミー・地球物理局・サハリン支所の定常観測点を利用できており、それぞれの観測点での維持管理は、順調にすすみ、全地球で発生するM5.5以上の地震データと、M4.5以上の千島海溝付近の地震データは、日本側に提供されて、日本側のデータセンターに保存され、研究に供されている。これらのデータは、世界の地震コミュニティに公開する予定である。
Ministry of Education, Culture, Sports, Science and Technology, 特定領域研究, 北海道大学, Coinvestigator not use grants, Competitive research funding, 16075201

Study on mechanism of tsunami earthquakes by using ocean-bottom seismometers and pressure gauges
Grants-in-Aid for Scientific Research(基盤研究(C))
2003 - 2005
Kenji HIRATA, 谷岡 勇市郎, 馬場 俊孝, 松本 浩幸, 高橋 浩晃, 佐竹 健治
The purpose of this study was to detect micro-tsunamis on the basis of analyses of ocean-bottom pressure gauge data, and then to examine the mechanism of tsunami earthquakes. However, we encountered a problem that was not known before so that we could not touch the second purpose but complete the first purpose. The problem is that pressure gauges have inherent transient thermal responses affecting pressure measurements. Inherent thermal response yields a large pseudo-pressure signal, with periods overlapping to major periods of tsunami, when temperature suddenly changes. Therefore, evaluati...
Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 特別認可法人海洋科学技術センター->独立行政法人海洋研究開発機構->特別認可法人海洋科学技術センター->独立行政法人海洋研究開発機構, Coinvestigator not use grants, Competitive research funding, 15540414

Research on seismo-tectonics along the collision border between the Amur plate and the Okhotsk plate.
Grants-in-Aid for Scientific Research(基盤研究(A))
2002 - 2004
Minoru KASAHARA, 中尾 茂, 木股 文昭, 加藤 照之, 高橋 浩晃, 勝俣 啓, 中川 光弘, 宮町 宏樹, 日置 幸介
In order to clarify the movement of the Amur plate and the Okhotsk plate which are located at the boundary between the Eurasia plate and the North American plate GPS observation in the Amur plate and the seismic observation in the southern Sakhalin are carried out during the period from 2002 and 2004. This cooperation was carried out under the agreement of Japanese and Russian Scientific and Technological Corroboration Committee. As a result, the movement of the Amur plate was not concluded dearly in three years. However, the following three years observation showed the dearly shortening at...
Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Coinvestigator not use grants, Competitive research funding, 14253002

地震調査委員会　　　　　　　　　　　　　　　
09 Sep. 2021 - 09 Sep. 2021
Others
Others
文部科学省

北海道環境審議会温泉部会　　　　　　　　　　　　　　　
31 Aug. 2021 - 31 Aug. 2021
Others
Others
北海道

教員免許状更新講習　　　　　　　　　　　　　　　
26 Jul. 2021 - 31 Aug. 2021
Organizing member
Qualification seminar
日本地震学会

FNN防災会議基調講演「千島海溝南部の超巨大地震と備え」　　　　　　　　　　　　　　　
27 Aug. 2021 - 27 Aug. 2021
Lecturer
Lecture
北海道文化放送

地震予知連絡会　　　　　　　　　　　　　　　
27 Aug. 2021 - 27 Aug. 2021
Others
Others
国土交通省国土地理院

弟子屈町ジオエネルギ―検討委員会　　　　　　　　　　　　　　　
24 Aug. 2021 - 24 Aug. 2021
Others
Others
弟子屈町

教員免許状更新講習　　　　　　　　　　　　　　　
27 Jul. 2020 - 21 Aug. 2021
Organizing member
Qualification seminar
日本地震学会

地震調査委員会　　　　　　　　　　　　　　　
11 Aug. 2021 - 11 Aug. 2021
Others
Others
文部科学省

北海道防災会議地震専門委員会　　　　　　　　　　　　　　　
19 Jul. 2021 - 19 Jul. 2021
Others
Others
北海道

地震調査委員会　　　　　　　　　　　　　　　
09 Jul. 2021 - 09 Jul. 2021
Others
Others
文部科学省

北海道防災会議地震専門委員会津波WG　　　　　　　　　　　　　　　
24 Jun. 2021 - 24 Jun. 2021
Others
Others
北海道

北海道大学全学公開講座
17 Jun. 2021 - 17 Jun. 2021
Lecturer
Lecture
北海道大学
27359072

地震調査委員会　　　　　　　　　　　　　　　
09 Jun. 2021 - 09 Jun. 2021
Others
Investigation
文部科学省

地震予知連絡会　　　　　　　　　　　　　　　
28 May 2021 - 28 May 2021
Others
Investigation
国土交通省国土地理院

北海道地震活動検討会　　　　　　　　　　　　　　　
18 May 2021 - 18 May 2021
Advisor
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

地震調査委員会　　　　　　　　　　　　　　　
14 May 2021 - 14 May 2021
Others
Investigation
文部科学省

北海道地震活動検討会　　　　　　　　　　　　　　　
15 Apr. 2021 - 15 Apr. 2021
Organizing member
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

地震調査委員会（臨時）　　　　　　　　　　　　　　　
22 Mar. 2021 - 22 Mar. 2021
Others
Others
文部科学省

日本海溝・千島海溝周辺海溝型地震・津波の オンライン勉強会　　　　　　　　　　　　　　　
15 Feb. 2021 - 15 Mar. 2021
Editor, Lecturer, Organizing member
Seminar
気象庁釧路地方気象台・室蘭地方気象台・函館地方気象台

北海道津波浸水想定設定ワーキンググループ　　　　　　　　　　　　　　　
10 Mar. 2021 - 10 Mar. 2021
Others
Others
北海道

地震調査委員会　　　　　　　　　　　　　　　
09 Mar. 2021 - 09 Mar. 2021
Others
Others
文部科学省

北海道地震活動検討会　　　　　　　　　　　　　　　
05 Mar. 2021 - 05 Mar. 2021
Organizing member
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

アトサヌプリ火山緊急減災砂防計画委員会　　　　　　　　　　　　　　　
02 Mar. 2021 - 02 Mar. 2021
Others
Others
北海道釧路総合振興局

国土地理院研究評価委員会　　　　　　　　　　　　　　　
01 Mar. 2021 - 01 Mar. 2021
Others
Others
国土交通省国土地理院

地震予知連絡会　　　　　　　　　　　　　　　
26 Feb. 2021 - 26 Feb. 2021
Others
Others
国土交通省国土地理院

弟子屈町ジオエネルギー検討委員会　　　　　　　　　　　　　　　
19 Feb. 2021 - 19 Feb. 2021
Others
Others
弟子屈町

北海道地震活動検討会　　　　　　　　　　　　　　　
17 Feb. 2021 - 17 Feb. 2021
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

十勝経営者大学　　　　　　　　　　　　　　　
02 Feb. 2021 - 02 Feb. 2021
Lecturer
Seminar
北海道中小企業者同友会とかち支部

気象庁札幌管区気象台地震活動解説業務研修　　　　　　　　　　　　　　　
14 Jan. 2021 - 14 Jan. 2021
Lecturer
Seminar
気象庁札幌管区気象台

地震調査委員会　　　　　　　　　　　　　　　
13 Jan. 2021 - 13 Jan. 2021
Others
Others
文部科学省

北海道地震活動検討会　　　　　　　　　　　　　　　
12 Jan. 2021 - 12 Jan. 2021
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

東大地震研京大防災研拠点間連携委員会　　　　　　　　　　　　　　　
06 Jan. 2021 - 06 Jan. 2021
Others
Others
東京大学地震研究所

日本地震学会学校教育委員会教員ウインター三―ディング　　　　　　　　　　　　　　　
26 Dec. 2020 - 26 Dec. 2020
Lecturer
Seminar
日本地震学会

札幌テレビ放送防災研修会　　　　　　　　　　　　　　　
22 Dec. 2020 - 22 Dec. 2020
Lecturer
Seminar
札幌テレビ放送

北海道地震活動検討会　　　　　　　　　　　　　　　
11 Dec. 2020 - 11 Dec. 2020
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

地震調査委員会　　　　　　　　　　　　　　　
09 Dec. 2020 - 09 Dec. 2020
Others
Others
文部科学省

地震予知連絡会　　　　　　　　　　　　　　　
26 Nov. 2020 - 26 Nov. 2020
Others
Others
国土交通省国土地理院

北海道地震活動検討会　　　　　　　　　　　　　　　
13 Nov. 2020 - 13 Nov. 2020
Others
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

中標津建設業協会設立50周年記念講演会　　　　　　　　　　　　　　　
07 Nov. 2020 - 07 Nov. 2020
Lecturer
Lecture
中標津建設業協会

北海道市町村振興協会　　　　　　　　　　　　　　　
27 Oct. 2020 - 27 Oct. 2020
Coverage cooperation
Pr
北海道市町村振興協会

日本海地震・津波調査プロジェクト 地域研究会　　　　　　　　　　　　　　　
23 Oct. 2020 - 23 Oct. 2020
Lecturer
Lecture
東京大学地震研究所

原子力規制委員会火山部会　　　　　　　　　　　　　　　
20 Oct. 2020 - 20 Oct. 2020
Others
Others
原子力規制庁

地震予知連絡会　　　　　　　　　　　　　　　
28 Aug. 2020 - 28 Aug. 2020
Others
Others
国土交通省国土地理院

北海道地震活動検討会　　　　　　　　　　　　　　　
10 Aug. 2020 - 10 Aug. 2020
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

国土地理院研究評価委員会　　　　　　　　　　　　　　　
06 Aug. 2020 - 06 Aug. 2020
Others
Others
国土交通省国土地理院

北海道火山防災協議会等連絡会　　　　　　　　　　　　　　　
30 Jul. 2020 - 30 Jul. 2020
Others
Others
北海道

北海道津波浸水想定設定ワーキンググループ　　　　　　　　　　　　　　　
07 Jul. 2020 - 07 Jul. 2020
Others
Others
北海道

地震調査委員会　　　　　　　　　　　　　　　
09 Apr. 2020 - 09 Apr. 2020
Others
Others
文部科学省

国土地理院研究評価委員会　　　　　　　　　　　　　　　
13 Mar. 2020 - 13 Mar. 2020
Others
Others
国土交通省国土地理院

地震予知連絡会　　　　　　　　　　　　　　　
21 Feb. 2020 - 21 Feb. 2020
Others
Others
国土交通省国土地理院

ＪＡ北海道中央会帯広支所役員研修会　　　　　　　　　　　　　　　
15 Feb. 2020 - 15 Feb. 2020
Lecturer
Lecture
JA北海道中央会帯広支所

北海道地震活動検討会　　　　　　　　　　　　　　　
06 Feb. 2020 - 06 Feb. 2020
Others
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

国土地理院研究評価委員会　　　　　　　　　　　　　　　
30 Jan. 2020 - 30 Jan. 2020
Others
Others
国土交通省国土地理院

アトサヌプリ火山緊急減災砂防計画委員会　　　　　　　　　　　　　　　
29 Jan. 2020 - 29 Jan. 2020
Others
Others
北海道釧路総合振興局

アトサヌプリ火山防災協議会　　　　　　　　　　　　　　　
22 Jan. 2020 - 22 Jan. 2020
Others
Others
弟子屈町

北海道防災会議地震専門委員会　　　　　　　　　　　　　　　
16 Jan. 2020 - 16 Jan. 2020
Others
Others
北海道

北海道地震活動検討会　　　　　　　　　　　　　　　
10 Jan. 2020 - 10 Jan. 2020
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

北海道地震活動検討会　　　　　　　　　　　　　　　
06 Dec. 2019 - 06 Dec. 2019
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

函館津波防災フィールドワーク　　　　　　　　　　　　　　　
03 Dec. 2019 - 04 Dec. 2019
Advisor
Seminar
NHK札幌拠点放送局・NHK函館放送局

弟子屈町 地熱理解促進協議会　　　　　　　　　　　　　　　
29 Nov. 2019 - 29 Nov. 2019
Others
Others
弟子屈町

地震予知連絡会　　　　　　　　　　　　　　　
22 Nov. 2019 - 22 Nov. 2019
Others
Others
国土交通省国土地理院

札幌市西区民センター地震災害に関する講演会　　　　　　　　　　　　　　　
16 Nov. 2019 - 16 Nov. 2019
Lecturer
Lecture
札幌市西区民センター

地域防災力強化勉強会　　　　　　　　　　　　　　　
14 Nov. 2019 - 14 Nov. 2019
Lecturer
Lecture
気象庁釧路地方気象台・北海道釧路総合振興局・北海道根室振興局

北海道地震活動検討会　　　　　　　　　　　　　　　
07 Nov. 2019 - 07 Nov. 2019
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

防災セミナー　　　　　　　　　　　　　　　
05 Nov. 2019 - 05 Nov. 2019
Lecturer
Lecture
日本技術士会北海道本部

アトサヌプリ火山噴火緊急減災対策砂防計画検討委員会　　　　　　　　　　　　　　　
30 Sep. 2019 - 30 Sep. 2019
Others
Others
北海道釧路総合振興局

いしかり市民カレッジ　　　　　　　　　　　　　　　
26 Sep. 2019 - 26 Sep. 2019
Lecturer
Lecture
石狩市

いしかり市民カレッジ　　　　　　　　　　　　　　　
19 Sep. 2019 - 19 Sep. 2019
Lecturer
Lecture
石狩市

北方四島地震火山専門家派遣事業（択捉島）　　　　　　　　　　　　　　　
12 Sep. 2019 - 18 Sep. 2019
Organizing member
Others
北海道大学

奥尻高校訪問対応　　　　　　　　　　　　　　　
10 Sep. 2019 - 10 Sep. 2019
Lecturer, Organizing member
Visiting lecture
奥尻高校

地震・防災フォーラムin札幌　　　　　　　　　　　　　　　
07 Sep. 2019 - 07 Sep. 2019
Lecturer
Lecture
財務省北海道財務局・気象庁札幌管区気象台・北海道・札幌市・一般社団法人北海道損害保険代理業協会・一般社団法人日本損害保険協会

北海道地震活動検討会　　　　　　　　　　　　　　　
06 Sep. 2019 - 06 Sep. 2019
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

教員免許状更新講習　　　　　　　　　　　　　　　
06 Aug. 2019 - 06 Aug. 2019
Lecturer, Organizing member
Qualification seminar
日本地震学会

北海道庁 火山防災協議会等連絡会　　　　　　　　　　　　　　　
02 Aug. 2019 - 02 Aug. 2019
Others
Others
北海道庁

構研エンジニアリング 業務報告会　　　　　　　　　　　　　　　
02 Aug. 2019 - 02 Aug. 2019
Lecturer
Lecture
構研エンジニアリング

北海道庁 防災・危機管理トップセミナー　　　　　　　　　　　　　　　
26 Jul. 2019 - 26 Jul. 2019
Lecturer
Seminar
北海道庁

国土地理院研究評価委員会　　　　　　　　　　　　　　　
23 Jul. 2019 - 23 Jul. 2019
Others
Others
国土交通省国土地理院

北海道地震活動検討会　　　　　　　　　　　　　　　
04 Jul. 2019 - 04 Jul. 2019
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

札幌市防災リーダー研修会　　　　　　　　　　　　　　　
28 Jun. 2019 - 28 Jun. 2019
Lecturer
Lecture
札幌市

北海道大学地震火山研究観測センター公開講座　　　　　　　　　　　　　　　
22 Jun. 2019 - 22 Jun. 2019
Lecturer, Organizing member
Lecture
北海道大学地震火山研究観測センター

北方四島地震火山専門家受入事業　　　　　　　　　　　　　　　
13 Jun. 2019 - 18 Jun. 2019
Organizing member
外務省

北海道地震活動検討会　　　　　　　　　　　　　　　
07 Jun. 2019 - 07 Jun. 2019
Organizing member
Investigation
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

千歳市市民防災講演会　　　　　　　　　　　　　　　
01 Jun. 2019 - 01 Jun. 2019
Lecturer
Lecture
千歳市・北海道石狩総合振興局

地震予知連絡会　　　　　　　　　　　　　　　
22 May 2019 - 22 May 2019
Others
国土交通省国土地理院

地震はなぜ起こる？-北海道の地震とその災害-　　　　　　　　　　　　　　　
30 Mar. 2019 - 30 Mar. 2019
Lecturer
Lecture
日本地質学会
市民講演会「動く大地のしくみを知り、地震・津波災害に備える」

北海道大学地震火山研究観測センターシンポジウム　　　　　　　　　　　　　　　
21 Mar. 2019 - 21 Mar. 2019
Lecturer
Lecture
北海道大学地震火山研究観測センター

平成30年北海道胆振東部地震調査研究成果報告会　　　　　　　　　　　　　　　
17 Mar. 2019 - 17 Mar. 2019
Presenter, Planner, Organizing member
Lecture
文部科学省科学研究費「平成30年北海道胆振東部地震とその災害に関する総合調査」研究班

報道機関等と気象台の勉強会　　　　　　　　　　　　　　　
25 Feb. 2019 - 25 Feb. 2019
Lecturer
Others
札幌管区気象台

地震予知連絡会　　　　　　　　　　　　　　　
22 Feb. 2019 - 22 Feb. 2019
Others
Others
国土交通省国土地理院

地震調査研究推進本部調査観測計画部会　　　　　　　　　　　　　　　
19 Feb. 2019 - 19 Feb. 2019
Others
Others
文部科学省

北海道における地熱エネルギー導入促進に向けた研究会　　　　　　　　　　　　　　　
13 Feb. 2019 - 13 Feb. 2019
Others
Others
北海道経済部

国土地理院研究評価委員会測地分科会　　　　　　　　　　　　　　　
01 Feb. 2019 - 01 Feb. 2019
Others
Others
国土交通省国土地理院

アトサヌプリ火山噴火緊急減災対策砂防計画検討委員会　　　　　　　　　　　　　　　
23 Jan. 2019 - 23 Jan. 2019
Others
Others
北海道釧路総合振興局

北海道の地震災害に備える　　　　　　　　　　　　　　　
19 Jan. 2019 - 19 Jan. 2019
Lecturer
Lecture
北海道・北海道開発局・札幌管区気象台
ほっかいどう防災ひろばinチ・カ・ホ

防災セミナーin留萌　　　　　　　　　　　　　　　
14 Dec. 2018 - 14 Dec. 2018
Lecturer
Lecture
国土交通省北海道開発局

北海道地震活動合同検討会　　　　　　　　　　　　　　　
04 Dec. 2018 - 04 Dec. 2018
Organizing member
Others
北海道大学・札幌管区気象台・国土地理院北海道地方測量部・北海道立総合研究機構地質研究所

津波防災地域づくり講演会　　　　　　　　　　　　　　　
30 Nov. 2018 - 30 Nov. 2018
Lecturer
Lecture
北海道建設部

地震予知連絡会　　　　　　　　　　　　　　　
30 Nov. 2018 - 30 Nov. 2018
Others
Others
国土交通省国土地理院

地震火山噴火予知研究協議会　　　　　　　　　　　　　　　
27 Nov. 2018 - 27 Nov. 2018
Others
Others
地震火山噴火予知研究協議会

北海道地震活動合同検討会　　　　　　　　　　　　　　　
12 Oct. 2018 - 12 Oct. 2018
Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

取材対応（uhb北海道文化放送）　　　　　　　　　　　　　　　
10 Oct. 2018 - 10 Oct. 2018
Advisor
Media report
北海道文化放送

弟子屈町地熱理解促進協議会　　　　　　　　　　　　　　　
02 Jul. 2018 - 02 Jul. 2018
Others
Others
弟子屈町

国土地理院研究評価委員会　　　　　　　　　　　　　　　
14 Jun. 2018 - 14 Jun. 2018
Others
Others
国土交通省国土地理院

北海道地震活動合同検討会　　　　　　　　　　　　　　　
06 Jun. 2018 - 06 Jun. 2018
Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震予知連絡会　　　　　　　　　　　　　　　
25 May 2018 - 25 May 2018
Others
Others
国土交通省国土地理院

北海道地震活動合同検討会　　　　　　　　　　　　　　　
09 May 2018 - 09 May 2018
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

北海道地震活動合同検討会　　　　　　　　　　　　　　　
25 Apr. 2018 - 25 Apr. 2018
Planner
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震火山噴火予知研究協議会　　　　　　　　　　　　　　　
24 Apr. 2018 - 24 Apr. 2018
Others
Others
地震火山噴火予知研究協議会

北海道大学地震火山研究観測センターシンポジウム　　　　　　　　　　　　　　　
24 Mar. 2018 - 24 Mar. 2018
Lecturer
Lecture
北海道大学地震火山研究観測センター

北海道地震活動合同検討会　　　　　　　　　　　　　　　
08 Mar. 2018 - 08 Mar. 2018
Informant, Demonstrator, Report writing
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震予知連絡会　　　　　　　　　　　　　　　
23 Feb. 2018 - 23 Feb. 2018
Others
国土地理院

弟子屈町地熱理解促進協議会　　　　　　　　　　　　　　　
20 Feb. 2018 - 20 Feb. 2018
Others
弟子屈町

地震調査研究推進本部調査観測計画部会　　　　　　　　　　　　　　　
13 Feb. 2018 - 13 Feb. 2018
Others
Others
文部科学省

国土地理院研究評価委員会測地学分科会　　　　　　　　　　　　　　　
02 Feb. 2018 - 02 Feb. 2018
Others
Others
国土地理院

北海道 防災会議地震火山対策部会地震専門委員会　　　　　　　　　　　　　　　
01 Feb. 2018 - 01 Feb. 2018
Others
Others
北海道

北海道における地熱エネルギー導入促進に向けた研究会　　　　　　　　　　　　　　　
18 Jan. 2018 - 18 Jan. 2018
Others
Others
北海道庁

北海道地震活動合同検討会　　　　　　　　　　　　　　　
12 Jan. 2018 - 12 Jan. 2018
Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

アトサヌプリ火山防災協議会コア会議　　　　　　　　　　　　　　　
11 Dec. 2017 - 12 Dec. 2017
Advisor
Others
アトサヌプリ火山防災協議会

北海道地震活動合同検討会２０年記念シンポジウム　　　　　　　　　　　　　　　
09 Dec. 2017 - 09 Dec. 2017
Lecturer, Organizing member

弟子屈町地熱理解促進協議会　　　　　　　　　　　　　　　
01 Dec. 2017 - 02 Dec. 2017
Others
弟子屈町

阿寒湖温泉地熱利用推進協議会フォーラム　　　　　　　　　　　　　　　
29 Nov. 2017 - 30 Nov. 2017
Others
阿寒湖温泉地熱利用推進協議会

弟子屈町地熱理解促進協議会　　　　　　　　　　　　　　　
15 Nov. 2017 - 17 Nov. 2017
Others
弟子屈町

津波防災地域づくりシンポジウムin小樽　　　　　　　　　　　　　　　
23 Oct. 2017 - 23 Oct. 2017
Lecturer
Lecture
北海道，北海道建設技術センター

地震調査研究推進本部調査観測計画部会　　　　　　　　　　　　　　　
16 Oct. 2017 - 16 Oct. 2017
Others
文部科学省

北海道地震活動合同検討会　　　　　　　　　　　　　　　
10 Oct. 2017 - 10 Oct. 2017
Organizing member
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

日本測地学会サマースクール　　　　　　　　　　　　　　　
28 Sep. 2017 - 30 Sep. 2017
Lecturer
日本測地学会

北海道地震活動合同検討会　　　　　　　　　　　　　　　
14 Sep. 2017 - 14 Sep. 2017
Organizing member
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震学夏の学校　　　　　　　　　　　　　　　
12 Sep. 2017 - 14 Sep. 2017
Planner, Organizing member
Seminar
日本地震学会

日ロ防災協力プログラム北方四島専門家交流受入事業　　　　　　　　　　　　　　　
05 Jul. 2017 - 11 Jul. 2017
Planner, Organizing member, Investigator
外務省

弟子屈町地熱理解促進協議会　　　　　　　　　　　　　　　
05 Jul. 2017 - 05 Jul. 2017
Others
弟子屈町

地震予知連絡会　　　　　　　　　　　　　　　
19 May 2017 - 19 May 2017
Others
国土地理院

北海道地震活動合同検討会　　　　　　　　　　　　　　　
10 May 2017 - 10 May 2017
Organizing member
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

北海道地震活動合同検討会　　　　　　　　　　　　　　　
20 Apr. 2017 - 20 Apr. 2017
Organizing member
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

火山防災協議会に参画する火山専門家等の連携会議　　　　　　　　　　　　　　　
28 Mar. 2017 - 28 Mar. 2017
Others
Others
内閣府

北海道地震活動合同検討会　　　　　　　　　　　　　　　
24 Mar. 2017 - 24 Mar. 2017
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

国土地理院研究評価委員会　　　　　　　　　　　　　　　
02 Mar. 2017 - 02 Mar. 2017
Others
Others
国土交通省国土地理院

北部防衛衛生学会「北海道で発生が予想される地震・津波・火山災害」　　　　　　　　　　　　　　　
01 Mar. 2017 - 01 Mar. 2017
Lecturer
Lecture
北部防衛衛生学会

地震調査研究推進本部 調査観測計画部会　　　　　　　　　　　　　　　
21 Feb. 2017 - 21 Feb. 2017
Others
Others
文部科学省

地震予知連絡会　　　　　　　　　　　　　　　
20 Feb. 2017 - 20 Feb. 2017
Others
Others
国土交通省国土地理院

北海道地震活動合同検討会　　　　　　　　　　　　　　　
15 Feb. 2017 - 15 Feb. 2017
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

北海道防災会議地震専門委員会　　　　　　　　　　　　　　　
09 Feb. 2017 - 09 Feb. 2017
Others
Others
北海道庁

今金町防災講演会　　　　　　　　　　　　　　　
21 Jan. 2017 - 21 Jan. 2017
Lecturer
Lecture
今金町議会

北海道地震活動合同検討会　　　　　　　　　　　　　　　
13 Jan. 2017 - 13 Jan. 2017
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

北海道地震活動合同検討会　　　　　　　　　　　　　　　
12 Dec. 2016 - 12 Dec. 2016
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

北海道地震活動合同検討会　　　　　　　　　　　　　　　
16 Nov. 2016 - 16 Nov. 2016
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震予知連絡会　　　　　　　　　　　　　　　
11 Nov. 2016 - 11 Nov. 2016
Others
Others
国土交通省国土地理院

北海道地震活動合同検討会　　　　　　　　　　　　　　　
24 Oct. 2016 - 24 Oct. 2016
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震調査研究本部 調査観測計画部会　　　　　　　　　　　　　　　
23 Sep. 2016 - 23 Sep. 2016
Others
Others
文部科学省

北海道地震活動合同検討会　　　　　　　　　　　　　　　
20 Sep. 2016 - 20 Sep. 2016
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震予知連絡会　　　　　　　　　　　　　　　
22 Aug. 2016 - 22 Aug. 2016
Report writing, Others
Others
国土交通省国土地理院

教員免許状更新講習「北海道の地震・津波とその防災」　　　　　　　　　　　　　　　
29 Jul. 2016 - 29 Jul. 2016
Lecturer, Planner, Organizing member
Qualification seminar
日本地震学会

防災セミナーin日高「北海道の地震津波災害に備えて」　　　　　　　　　　　　　　　
25 Jul. 2016 - 25 Jul. 2016
Lecturer
Lecture
国土交通省北海道開発局

北海道地震活動合同検討会　　　　　　　　　　　　　　　
21 Jul. 2016 - 21 Jul. 2016
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震調査研究推進本部 調査観測計画部会　　　　　　　　　　　　　　　
08 Jul. 2016 - 08 Jul. 2016
Others
Others
文部科学省

日本測量協会北海道支部「今後予想される道内の地震・津波・火山噴火」　　　　　　　　　　　　　　　
30 Jun. 2016 - 30 Jun. 2016
Lecturer
Lecture
日本測量協会北海道支部

北海道地震活動合同検討会　　　　　　　　　　　　　　　
28 Jun. 2016 - 28 Jun. 2016
Others
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

国土地理院研究評価委員会　　　　　　　　　　　　　　　
16 Jun. 2016 - 16 Jun. 2016
Others
Others
国土交通省国土地理院

北海道大学地震火山研究観測センター公開講座「北海道の地震と津波」　　　　　　　　　　　　　　　
11 Jun. 2016 - 11 Jun. 2016
Lecturer
Lecture
北海道大学地震火山研究観測センター

芦別市の地震　　　　　　　　　　　　　　　
07 Jun. 2016 - 07 Jun. 2016
Advisor, Informant
Others
芦別市役所

北海道防災会議津波WG　　　　　　　　　　　　　　　
07 Jun. 2016 - 07 Jun. 2016
Others
Others
北海道庁

北海道地震活動合同検討会　　　　　　　　　　　　　　　
19 May 2016 - 19 May 2016
Planner, Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震予知連絡会　　　　　　　　　　　　　　　
18 May 2016 - 18 May 2016
Others
Others
国土交通省国土地理院

日本衛生学会講演会「自然災害と人間の共生」　　　　　　　　　　　　　　　
13 May 2016 - 13 May 2016
Lecturer
Lecture
日本衛生学会

地震調査研究推進本部 調査観測計画部会　　　　　　　　　　　　　　　
11 May 2016 - 11 May 2016
Others
Others
文部科学省

HBCニュース「熊本地震」　　　　　　　　　　　　　　　
06 May 2016 - 06 May 2016
Lecturer
Media report
HBC北海道放送

北海道防災会議地震専門委員会　　　　　　　　　　　　　　　
28 Mar. 2016 - 28 Mar. 2016
Others
Others
北海道庁

北海道地震活動合同検討会　　　　　　　　　　　　　　　
24 Mar. 2016 - 24 Mar. 2016
Others
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

地震予知連絡会　　　　　　　　　　　　　　　
22 Feb. 2016 - 22 Feb. 2016
Report writing, Others
Others
国土交通省国土地理院

北海道地震活動合同検討会　　　　　　　　　　　　　　　
Jan. 2016 - Jan. 2016
Organizing member
Others
北海道大学，札幌管区気象台，国土地理院北海道地方測量部，北海道立総合研究機構地質研究所

教員免許状更新講習「北海道の地震・津波とその防災」　　　　　　　　　　　　　　　
Aug. 2015 - Aug. 2015
Lecturer, Planner, Organizing member
Qualification seminar
日本地震学会

日本山岳会北海道支部講演会「カムチャツカ火山群」　　　　　　　　　　　　　　　
Jul. 2015 - Jul. 2015
Lecturer, Contribution
Lecture
日本山岳会北海道支部

北海道大学地震火山研究観測センター公開講座「北海道の地震と津波」　　　　　　　　　　　　　　　
Jun. 2015 - Jun. 2015
Lecturer
Lecture
北海道大学地震火山研究観測センター

雌阿寒自然塾「火山の噴火と予知」　　　　　　　　　　　　　　　
May 2015 - May 2015
Lecturer
Lecture
雌阿寒自然塾

ほっかいどう防災ひろばinチカホ「地震を知る！地震に備える！」　　　　　　　　　　　　　　　
Mar. 2015 - Mar. 2015
Lecturer, Demonstrator, Investigator
Science cafe
札幌管区気象台

雌阿寒自然塾「火山とは何か」　　　　　　　　　　　　　　　
Sep. 2014 - Sep. 2014
Lecturer
Lecture
雌阿寒自然塾

教員免許状更新講習「北海道の地震・津波とその防災」　　　　　　　　　　　　　　　
Aug. 2014 - Aug. 2014
Lecturer, Planner, Organizing member
Qualification seminar
日本地震学会

高校訪問授業「北海道大学の地震火山研究」　　　　　　　　　　　　　　　
Jun. 2014 - Jun. 2014
Lecturer
Visiting lecture
京都府立福知山高校

いしかり市民カレッジ「日本海の地震と津波」　　　　　　　　　　　　　　　
Oct. 2013 - Oct. 2013
Lecturer
Lecture
いしかり市民カレッジ

雌阿寒自然塾「火山とは何か」　　　　　　　　　　　　　　　
Sep. 2013 - Sep. 2013
Lecturer
Lecture

教員免許状更新講習「北海道の地震・津波とその防災」　　　　　　　　　　　　　　　
Aug. 2013 - Aug. 2013
Lecturer, Planner, Organizing member
Qualification seminar
日本地震学会

北海道火山勉強会一般講演会「網走地方の地震と津波」　　　　　　　　　　　　　　　
Jul. 2013 - Jul. 2013
Lecturer
Lecture
北海道火山勉強会

北海道大学地震火山研究観測センター公開講座「北海道の地震と津波」　　　　　　　　　　　　　　　
Jun. 2013 - Jun. 2013
Lecturer
Lecture

栗山町市民講座「地震を知る，そして自分と家族を守る」　　　　　　　　　　　　　　　
Feb. 2013 - Feb. 2013
Lecturer
Lecture
栗山町役場

先端科学移動大学「北海道の地震火山とアジア北東地域のプレート運動」　　　　　　　　　　　　　　　
Nov. 2012 - Nov. 2012
Lecturer
Visiting lecture
北海道青少年科学文化財団

教員免許状更新講習「北海道の地震・津波とその防災」　　　　　　　　　　　　　　　
Aug. 2012 - Aug. 2012
Lecturer, Planner, Organizing member
Qualification seminar
日本地震学会

北海道防災会議地震火山専門委員会地震部会「太平洋沿岸の津波浸水予測図に関する説明会」　　　　　　　　　　　　　　　
Jul. 2012 - Jul. 2012
Lecturer, Advisor, Informant
Seminar
北海道庁

「北海道の地震と津波」　　　　　　　　　　　　　　　
Jun. 2012 - Jun. 2012
Lecturer
Lecture
前田建設工業

北海道大学地震火山研究観測センター公開講座「北海道の地震と津波」　　　　　　　　　　　　　　　
Jun. 2012 - Jun. 2012
Lecturer, Contribution
Lecture
北海道大学地震火山研究観測センター

「北海道の地震と津波」　　　　　　　　　　　　　　　
Apr. 2012 - Apr. 2012
Lecturer
Lecture
防災地質工業株式会社

先端科学移動大学「地震津波火山噴火の解明と減災への取り組み：東日本大震災からのメッセージ」　　　　　　　　　　　　　　　
Nov. 2011 - Nov. 2011
Lecturer, Investigator
Visiting lecture
北海道青少年科学文化財団

NHK札幌放送局 津波勉強会　　　　　　　　　　　　　　　
Nov. 2011 - Nov. 2011
Lecturer
Lecture
NHK札幌放送局

色丹島穴澗公民館「東北沖地震津波の教訓」　　　　　　　　　　　　　　　
Sep. 2011 - Sep. 2011
Lecturer, Planner, Organizing member
Lecture
北海道大学地震火山研究観測センター
北方四島地震専門家交流事業

色丹島斜古丹公民館「東北沖地震津波の教訓」　　　　　　　　　　　　　　　
Sep. 2011 - Sep. 2011
Lecturer, Planner, Organizing member
Lecture
北海道大学地震火山研究観測センター
北方四島地震専門家交流事業

地震発生のしくみと北海道および札幌の地震　　　　　　　　　　　　　　　
Sep. 2011 - Sep. 2011
Lecturer
Lecture
札幌文具事務用品組合

物理教育学会北海道支部「地震研究の現状と東北沖地震」　　　　　　　　　　　　　　　
Jul. 2011 - Jul. 2011
Lecturer
Lecture
物理教育学会北海道支部

uhb大学「直下型地震と札幌」　　　　　　　　　　　　　　　
Jun. 2011 - Jun. 2011
Lecturer, Investigator
Lecture
uhb財団

札幌市清田区民センター防災報告会「石狩地方中南部の地震」　　　　　　　　　　　　　　　
Dec. 2010 - Dec. 2010
Lecturer
Lecture
札幌市役所

北広島市夢プラザ防災報告会「石狩地方中南部の地震」　　　　　　　　　　　　　　　
Dec. 2010 - Dec. 2010
Lecturer
Lecture
北広島市

安平町富岡小学校「地震のおはなし」　　　　　　　　　　　　　　　
Oct. 2008 - Oct. 2008
Lecturer, Planner, Organizing member
Visiting lecture
北海道大学地震火山研究観測センター

札幌市平岸小学校「地震のおはなし」　　　　　　　　　　　　　　　
Sep. 2007 - Sep. 2007
Lecturer
Lecture
JSTサイエンスパートナーシップ

札幌市平岸西小学校「地震のおはなし」　　　　　　　　　　　　　　　
Oct. 2006 - Oct. 2006
Lecturer
Visiting lecture
JSTサイエンスパートナーシップ

札幌市平岸西小学校「地震のおはなし」　　　　　　　　　　　　　　　
Mar. 2006 - Mar. 2006
Lecturer
Lecture
北海道立地質研究所

試錘研究会「地震火山現象に関連した孔内地下水変動」　　　　　　　　　　　　　　　
Feb. 2006 - Feb. 2006
Lecturer
Lecture
北海道立地質研究所

札幌市平岸小学校「地震のおはなし」　　　　　　　　　　　　　　　
Oct. 2005 - Oct. 2005
Lecturer
Visiting lecture
北海道立地質研究所

JICAケニア測量地図学院 域外講師　　　　　　　　　　　　　　　
Aug. 2002 - Aug. 2002
Lecturer, Advisor
Research advise

JICAケニア測量地図学院 短期専門家　　　　　　　　　　　　　　　
Aug. 2000 - Aug. 2000
Lecturer, Advisor
Research advise
国際協力事業団・国土交通省国土地理院

取材対応（HBC北海道放送）
Jul. 2021
HBC北海道放送
27359072, [Media report]

取材対応（NHK札幌）
Jul. 2021
NHK札幌放送局
27359072, [Media report]

北海道新聞
Jul. 2021
北海道新聞
27359072, [Paper]

取材対応（NHK釧路）
15 Jun. 2021
NHK釧路放送局
27359072, [Media report]

取材対応（HTB北海道テレビ）　　　　　　　　　　　　　　　
Jun. 2021
HTB北海道テレビ
イチオシ
[Media report]

取材対応（uhb北海道文化放送）　　　　　　　　　　　　　　　
Jun. 2021
uhb北海道文化放送
みんテレ
[Media report]

取材対応（STV札幌テレビ放送）　　　　　　　　　　　　　　　
Jun. 2021
STV札幌テレビ放送
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
Jun. 2021
NHK札幌放送局
[Media report]

取材対応（NHK釧路）
17 May 2021
NHK札幌放送局
ほっとニュース北海道
27359072, [Media report]

取材対応（NHK釧路）　　　　　　　　　　　　　　　
14 May 2021
NHK釧路放送局
[Media report]

取材対応（十勝毎日新聞）　　　　　　　　　　　　　　　
May 2021
十勝毎日新聞
[Paper]

取材対応（NHK札幌）
09 Apr. 2021
NHK札幌放送局
ほっとニュース北海道
30644178, [Media report]

取材対応（読売新聞北海道支局）　　　　　　　　　　　　　　　
Apr. 2021
読売新聞社
[Paper]

取材対応（STV）　　　　　　　　　　　　　　　
30 Mar. 2021
STV札幌テレビ放送
どさんこワイド
[Media report]

取材対応（HTB）　　　　　　　　　　　　　　　
29 Mar. 2021
HTB北海道テレビ
イチオシ！
[Media report]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
12 Mar. 2021
北海道新聞
[Paper]

取材対応（読売新聞北海道支社）　　　　　　　　　　　　　　　
Mar. 2021
読売新聞
読売新聞北海道版
[Paper]

取材対応（NHK東京）　　　　　　　　　　　　　　　
Mar. 2021
NHK東京本局
[Media report]

取材対応（北海道建設新聞）　　　　　　　　　　　　　　　
Mar. 2021
北海道建設新聞
[Paper]

取材対応（HTB）　　　　　　　　　　　　　　　
Mar. 2021
北海道テレビ

取材対応（産経新聞）　　　　　　　　　　　　　　　
Mar. 2021
産経新聞
[Media report]

取材対応（STV）　　　　　　　　　　　　　　　
01 Mar. 2021
STV札幌テレビ放送
どさんこワイド

取材対応（uhb）　　　　　　　　　　　　　　　
15 Feb. 2021
uhb北海道文化放送
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
15 Feb. 2021
ほっとニュース北海道
[Media report]

取材対応（HTB）　　　　　　　　　　　　　　　
15 Feb. 2021
HTB北海道テレビ
イチオシ！
[Media report]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
Oct. 2020
北海道新聞
[Paper]

NHK札幌放送局北海道まるごとラジオ　　　　　　　　　　　　　　　
10 Sep. 2020
NHK札幌放送局
[Media report]

取材対応（建設行政新聞）　　　　　　　　　　　　　　　
Jul. 2020
建設行政新聞
けんせつ国土
[Paper]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
22 Apr. 2020
北海道新聞
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
20 Apr. 2020
NHK札幌放送局
[Media report]

取材対応（uhb）　　　　　　　　　　　　　　　
30 Mar. 2020
uhb北海道文化放送
[Media report]

取材対応（HTB）　　　　　　　　　　　　　　　
10 Mar. 2020
HTB北海道テレビ
[Media report]

取材対応（HBC）　　　　　　　　　　　　　　　
04 Mar. 2020
北海道放送
[Media report]

取材対応（十勝毎日新聞）　　　　　　　　　　　　　　　
28 Feb. 2020
十勝毎日新聞
[Paper]

取材対応（北海道新聞旭川支局）　　　　　　　　　　　　　　　
12 Dec. 2019
北海道新聞
[Paper]

取材対応（uhb）　　　　　　　　　　　　　　　
12 Dec. 2019
北海道文化放送
[Media report]

取材対応（HBC）　　　　　　　　　　　　　　　
12 Dec. 2019
北海道放送
[Media report]

取材対応（STV）　　　　　　　　　　　　　　　
12 Dec. 2019
札幌テレビ放送
[Media report]

NHK 北海道クローズアップ　　　　　　　　　　　　　　　
06 Sep. 2019
NHK札幌放送局
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
29 Aug. 2019
NHK札幌放送局
[Media report]

取材対応（北海道放送）　　　　　　　　　　　　　　　
19 Aug. 2019
北海道放送
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
05 Aug. 2019
NHK札幌放送局
[Media report]

取材対応（札幌テレビ放送）　　　　　　　　　　　　　　　
16 Jul. 2019
札幌テレビ放送
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
26 Jun. 2019
NHK札幌放送局
[Media report]

取材対応（北海道文化放送）　　　　　　　　　　　　　　　
26 Jun. 2019
北海道文化放送
[Media report]

取材対応（北海道放送）　　　　　　　　　　　　　　　
25 Jun. 2019
北海道放送
[Media report]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
24 Jun. 2019
北海道新聞
[Paper]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
22 Jun. 2019
北海道新聞
[Paper]

取材対応（北海道文化放送）　　　　　　　　　　　　　　　
19 Jun. 2019
北海道文化放送
[Media report]

取材対応（北海道テレビ放送）　　　　　　　　　　　　　　　
19 Jun. 2019
北海道テレビ放送
[Media report]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
17 Dec. 2018
NHK札幌放送局
[Media report]

取材対応（読売新聞）　　　　　　　　　　　　　　　
03 Dec. 2018
読売新聞
[Paper]

取材対応（uhb北海道文化放送）　　　　　　　　　　　　　　　
10 Oct. 2018
uhb北海道文化放送

取材対応（建設行政新聞）　　　　　　　　　　　　　　　
05 Oct. 2018
建設行政新聞
[Paper]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
03 Oct. 2018
北海道新聞
[Paper]

取材対応（NHK札幌）　　　　　　　　　　　　　　　
20 Sep. 2018
NHK札幌放送局
[Media report]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
20 Sep. 2018
北海道新聞
[Paper]

取材対応（uhb）　　　　　　　　　　　　　　　
13 Sep. 2018
北海道文化放送
[Media report]

取材対応（HBC）　　　　　　　　　　　　　　　
12 Sep. 2018
北海道放送
[Media report]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
12 Sep. 2018
北海道新聞
[Paper]

ヘリ取材（uhb）　　　　　　　　　　　　　　　
08 Sep. 2018
北海道文化放送
[Media report]

取材対応（STV）　　　　　　　　　　　　　　　
07 Sep. 2018
札幌テレビ放送
[Media report]

スタジオ出演（HBC）　　　　　　　　　　　　　　　
07 Sep. 2018
北海道放送
[Media report]

取材対応（HTB）　　　　　　　　　　　　　　　
06 Sep. 2018
北海道テレビ放送
[Media report]

取材対応（NHK）　　　　　　　　　　　　　　　
06 Sep. 2018
日本放送協会
[Media report]

取材対応（北海道新聞）　　　　　　　　　　　　　　　
06 Sep. 2018
北海道新聞
[Paper]

スタジオ出演（HBC）　　　　　　　　　　　　　　　
06 Sep. 2018
北海道放送
[Media report]

取材対応（uhb）　　　　　　　　　　　　　　　
06 Sep. 2018
北海道文化放送
[Media report]

取材対応（HBC）　　　　　　　　　　　　　　　
06 Sep. 2018
北海道放送
[Media report]

HBC取材　　　　　　　　　　　　　　　
03 Jul. 2018
HBC北海道放送
[Media report]

uhb取材　　　　　　　　　　　　　　　
26 Jun. 2018
uhb北海道文化放送
[Media report]

北海道新聞取材　　　　　　　　　　　　　　　
26 Jun. 2018
北海道新聞社
[Paper]

NHK函館局取材　　　　　　　　　　　　　　　
11 Jun. 2018
NHK函館放送局
[Media report]

HBC「今日ドキ」「道の日本海側津波想定」　　　　　　　　　　　　　　　
09 Feb. 2017
HBC北海道放送
[Media report]

札幌光星高校新聞部取材対応　　　　　　　　　　　　　　　
01 Jul. 2016
札幌光星高校新聞部
[Paper]

HBC「今日ドキ」「熊本で震度５強」　　　　　　　　　　　　　　　
17 Jun. 2016
HBC北海道放送
[Media report]

STVニュース「函館で震度5強」　　　　　　　　　　　　　　　
17 Jun. 2016
NHK札幌放送局
[Media report]

NHK札幌放送局ニュース「函館で震度5強」　　　　　　　　　　　　　　　
17 Jun. 2016
NHK札幌放送局
[Media report]

NHK札幌放送局「クローズアップ北海道」「隠れ活断層」　　　　　　　　　　　　　　　
13 May 2016
NHK札幌放送局
[Media report]

STVニュース「熊本地震」　　　　　　　　　　　　　　　
12 May 2016
STV札幌テレビ放送
[Media report]

NHK札幌放送局ニュース「熊本地震」　　　　　　　　　　　　　　　
02 May 2016
NHK札幌放送局
[Media report]

STV「どさんこワイド」「熊本地震」　　　　　　　　　　　　　　　
02 May 2016
STV札幌テレビ放送
[Media report]

HBC「今日ドキ」「熊本地震」　　　　　　　　　　　　　　　
15 Apr. 2016
HBC北海道放送
[Media report]

NHK札幌放送局「おはよう北海道」「防災フロントライン」　　　　　　　　　　　　　　　
Jul. 2012
NHK札幌放送局
[Media report]

NHK札幌放送局「おはよう北海道」「防災フロントライン」　　　　　　　　　　　　　　　
Apr. 2012
NHK札幌放送局
おはよう北海道
[Media report]

NHK札幌放送局「北クロ・白熱トークスペシャルin北海道大学 震災から1年 私たちにできることは」　　　　　　　　　　　　　　　
Mar. 2012
NHK札幌放送局
北海道クローズアップ
[Media report]