Researcher basic information

• Doctor of Science, Kyushu University, Mar. 2022

• https://researchmap.jp/dan_muramatsu?lang=en

• https://orcid.org/0000-0001-6968-770X
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202101020572145659

• 80965038

• https://orcid.org/0000-0001-6968-770X

• 202101020572145659

• Volcano observation
• Infrasound
• Earthquake
• Analog experiment
• Rheology
• Vulcanian eruption
• Hydrothermal eruption
• Antarctic observation

• Natural Science, Solid earth sciences, 火山学

Research activity information

• May 2022, 日本火山学会, Student Paper Award
  Dan Muramatsu, Mie Ichihara, Takeshi Matsushima, Osamu Kuwano, Yasuhisa Tajima (2022) Surface eruptive dynamics of 2018 small phreatic eruption of Iwo-Yama volcano, Japan: Constraints from seismo-acoustic observation and mud suspension rheology. J. Volcanol. Geotherm. Res., 421, 107452, doi:10.1016/j.jvolgeores.2021.107452.
• Oct. 2021, 日本火山学会, 2021年度日本火山学会学生優秀発表賞
  桜島昭和火口のブルカノ式噴火に先行する火映変動現象の解析

• Review of Volcanic Activity and Geophysical Observations since the 20th Century at Ebinokogen Iwo-Yama Volcano
  Dan MURAMATSU; Takeshi MATSUSHIMA
  Journal of Geography (Chigaku Zasshi), 135, 3, 229, 252, Tokyo Geographical Society, 25 Jun. 2026, [Peer-reviewed], [Invited], [Lead author]
  Scientific journal
• Trans-crustal magma plumbing system of Kirishima Volcanic Complex as inferred from dense broadband magnetotelluric observations
  Koki Aizawa; Dan Muramatsu; Kaori Tsukamoto; Yoshiko Teguri; Takao Koyama; Mitsuru Utsugi; Wataru Kanda; Tasuku Inomata; Hiromichi Shigematsu; Hiroshi Shimizu
  Earth, Planets and Space, 78, 1, Springer Science and Business Media LLC, 09 Mar. 2026, [Peer-reviewed]
  Scientific journal, Abstract
  
  To investigate the magma plumbing system of the Kirishima Volcanic Complex (KVC), we conducted a broadband magnetotelluric (MT) survey over an expanded area of approximately 60 × 60 km, including the region around Shinmoe-dake volcano, which recently experienced magmatic eruptions in 2011, 2018, and 2025. Three-dimensional inversion of the MT data reveals a detailed resistivity structure extending to upper mantle depths. A large low-resistivity zone (C1) is interpreted as a long-lived trans-crustal magmatic system, whereas an adjacent high-resistivity zone (R1) is interpreted as solidified magma associated with past caldera-forming eruptions. The geodetically inferred pressure source associated with the recent eruptions of Shinmoe-dake is situated at the boundary between C1 and R1 and is interpreted as a small, temporary magma pocket. The craters of three active volcanoes (Iwo-yama, Shinmoe-dake, and Ohachi) are located above the edges of C1, and deep low-frequency earthquakes (DLFEs) occur at its eastern edge. Notably, the spatial alignment of the DLFE cluster, pressure source, and Shinmoe-dake crater is approximately linear and follows the margin of C1, suggesting that magma preferentially ascends along the edge of C1. Furthermore, the nearly simultaneous onset of DLFEs, pressure source inflation, and shallow seismicity—with time lags of only a few days—indicates the presence of an established and efficient magma ascent pathway along the edge of C1. The large volume of C1 (> 3000 km ³ ) and its structural characteristics imply a relatively high potential for large-scale eruptions to occur over short timescales in the future. These findings provide a new framework for understanding the long-term magmatic evolution and eruption potential of the KVC.
  
  Graphical abstract
• Seismoacoustic Analysis of Possible Vent‐Drying Sequence During Phreatomagmatic Activity on 13 July 2021 at Semisopochnoi Island, Alaska
  Dan Muramatsu; John J. Lyons; Hannah R. Dietterich; Mie Ichihara; Alexandra M. Iezzi
  Geophysical Research Letters, 28 Feb. 2026, [Peer-reviewed], [Lead author]
  Scientific journal
• Three-dimensional resistivity structure beneath Beppu and Yufuin geothermal fields imaged by dense broad-band magnetotelluric observations
  Koki Aizawa; Yuto Yamamoto; Asuma Wakabayashi; Dan Muramatsu; Satoru Aniya; Harutou Tanabe; Shiori Fujita; Azusa Shito; Takao Koyama; Ichiro Shiozaki; Masahiro Ichiki
  Earth, Planets and Space, 16 Oct. 2025, [Peer-reviewed]
  Scientific journal
• Three-dimensional resistivity structure of Hakone volcano, Japan.
  Shigmatsu Hiromichi; Aizawa Koki; Inoue Tomohiro; Matsunaga Keita; Tanabe Harutou; Kono Taiki; Hirata Issei; Matsubara Rin; Nakamura Kensuke; Murofushi Ryuma; Uyeshima Makoto; Koyama Takao; Katsuyama Asumi; Uchida Kazunari; Hashimoto Tasuku M.; Watanabe Atsushi; Nishimoto Taro; Akiyama Takahiro; Muramatsu Dan; Oishi Tatsuto; Matsunaga Yasuo; Yoshimura Ryokei; Komatsu Shintaro; Yoneda Itaru; Miura Tsutomu; Tatsuyama Yasuto; Nagaoka Airi; Nada Ayano; Nakagawa Jun; Tomisaka Kazuhide; Ogawa Yasuo; Yoshikawa Masahiro; Kitaoka Norihiro; Ichihara Hiroshi; Sakurai Miku; Onaka Kokoro; Masuda Shogo; Yoshizawa Fumihisa; Semba Ryutaro; Yamashita Nagi; Sasaki Koki; Mannen Kazutaka
  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2025, 149, 149, The Volcanological Society of Japan, 2025
  Japanese
• Detection of infrasound sources using three-years array data in 2019-2021 deployed at the Lützow-Holm Bay region, Antarctica
  Masaki Kanao; Takahiko Murayama; Masa Yuki Yamamoto; Yoshiaki Ishihara; Dan Muramatsu; Makiko Iwakuni; Mami Nogami
  Annals of Geophysics, 67, 5, 16 Dec. 2024, [Peer-reviewed]
  Scientific journal
• Volcanic tremor associated with successive gas emission activity at a boiling pool: Analyses of seismic array and visible image data recorded at Iwo-Yama in Kirishima Volcanic complex, Japan
  Masato Hata; Takeshi Nishimura; Takeshi Matsushima; Tomofumi Kozono; Tsutomu Nagatsuma; Ken T. Murata; Kazutaka Kikuta; Dan Muramatsu; Hisashi Nakahara
  Journal of Volcanology and Geothermal Research, 455, 108212, 108212, Elsevier BV, Nov. 2024, [Peer-reviewed]
  Scientific journal
• Multi-parametric observations of intermittent hydrothermal water discharge in West Crater of Iwo-Yama volcano, Kirishima Volcanic Complex, Japan
  Harutou Tanabe; Takeshi Matsushima; Koki Aizawa; Dan Muramatsu
  Earth, Planets and Space, 75, 1, Dec. 2023, [Peer-reviewed]
  Scientific journal
• Performance Test of Infrasound Sensor in Low-temperature Environment ─ Potential for Application in Antarctic Observation ─
  Muramatsu Dan; Ichihara Mie; Matsushima Takeshi; Kanao Masaki; Yamamoto Masa-yuki
  南極資料, 67, 1, 11, Research Organization of Information and Systems National Institute of Polar Research, Oct. 2023, [Peer-reviewed], [Lead author], [Domestic magazines]
  Japanese, Scientific journal, For infrasound monitoring in Antarctica, there is a need for infrasound sensors with low power consumption and high resistance to low-temperature environments. A new-type infrasound sensor (TYPE7744N/5002A) manufactured by ACO Co., Ltd. (Japan) with the cooperation of the Earthquake Research Institute, the University of Tokyo, achieves less than half the power consumption of existing models. To evaluate the applicability of the new sensor to Antarctic observation, we conducted a low-temperature (－30℃) test for four types of sensors, including the new one. We compared the results to those from a room temperature (21℃) test and examined changes in amplitude-phase characteristics based on a reference sensor (Model60Vx2, Chaparral Physics), proven in use in polar regions. There were no problems in the operation of the new sensor during the 30 days of the test. Spectral power ratio to the reference sensor changed up to 19% compared to the room temperature test, suggesting that the sensitivity fluctuates with temperature. Phase characteristics were not significantly affected by low temperatures. Future trials are desired to evaluate the long-term stability of the new sensor, e.g., by conducting experimental overwintering observations at Syowa Station.
• Magma transport along structural boundaries in the upper crust: insights from broad-band magnetotelluric constraints on the structure beneath Unzen volcano, Japan
  Agnis Triahadini; Koki Aizawa; Tasuku M. Hashimoto; Keita Chiba; Kazunari Uchida; Yuto Yamamoto; Kanta Miyano; Dan Muramatsu; Satoru Aniya; Ayumu Okubo; Yuta Kawamura
  Geophysical Journal International, 234, 2, 1268, 1281, 01 Aug. 2023, [Peer-reviewed]
  Scientific journal
• Vulcanian eruption processes inferred from volcanic glow analysis at Sakurajima volcano, Japan
  Dan Muramatsu; Koki Aizawa; Akihiko Yokoo; Takeshi Tameguri; Masato Iguchi
  Bulletin of Volcanology, 85, 7, Springer Science and Business Media LLC, 27 Jun. 2023, [Peer-reviewed], [Lead author], [International Magazine]
  English, Scientific journal
• Experiment to distinguish two fumaroles consistently emanating infrasound at Kirishima Iwo-Yama
  Kazuya Yamakawa; Mie Ichihara; Dan Muramatsu; Takeshi Matsushima; Hidetoshi Takahashi; Ruka Wada; Isao Shimoyama
  EARTH PLANETS AND SPACE, 75, 1, Feb. 2023, [Peer-reviewed]
  English, Scientific journal
• Phreatic volcanic eruption preceded by observable shallow groundwater flow at Iwo-Yama, Kirishima Volcanic Complex, Japan
  Koki Aizawa; Dan Muramatsu; Takeshi Matsushima; Takao Koyama; Makoto Uyeshima; Shigeru Nakao
  Communications Earth and Environment, 3, 1, Dec. 2022, [Peer-reviewed]
  Scientific journal
• Surface eruptive dynamics of 2018 small phreatic eruption of Iwo-Yama volcano, Japan: Constraints from seismo-acoustic observation and mud suspension rheology
  Dan Muramatsu; Mie Ichihara; Takeshi Matsushima; Osamu Kuwano; Yasuhisa Tajima
  Journal of Volcanology and Geothermal Research, 421, 107452, 107452, Elsevier BV, Jan. 2022, [Peer-reviewed], [Lead author], [International Magazine]
  Scientific journal
• A simple method to evaluate the air-to-ground coupling efficiency: a tool helping the assessment of seismic/infrasonic energy partitioning during an eruption
  Mie Ichihara; Kazuya Yamakawa; Dan Muramatsu
  Earth, Planets and Space, 73, 1, Springer Science and Business Media LLC, Dec. 2021, [Peer-reviewed]
  Scientific journal
• Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan
  Koki Aizawa; Shinichi Takakura; Hisafumi Asaue; Katsuaki Koike; Ryokei Yoshimura; Ken’ichi Yamazaki; Shintaro Komatsu; Mitsuru Utsugi; Hiroyuki Inoue; Kaori Tsukamoto; Makoto Uyeshima; Takao Koyama; Wataru Kanda; Tohru Yoshinaga; Nobuo Matsushima; Kazunari Uchida; Yuko Tsukashima; Takeshi Matsushima; Hiroshi Ichihara; Dan Muramatsu; Yoshiko Teguri; Azusa Shito; Satoshi Matsumoto; Hiroshi Shimizu
  Earth, Planets and Space, 73, 1, Dec. 2021, [Peer-reviewed]
  Scientific journal
• Reconstructing surface eruptive sequence of 2018 small phreatic eruption of Iwo-yama volcano, Kirishima Volcanic Complex, Japan, by infrasound cross-correlation analysis
  Dan Muramatsu; Takeshi Matsushima; Mie Ichihara
  Earth, Planets and Space, 73, 1, Dec. 2021, [Peer-reviewed], [Lead author], [International Magazine]
  Scientific journal
• Report of the Study Meeting for Young Volcanologist 2019 in Unzen Volcano, Japan
  MURAMATSU Dan; MARUISHI Takafumi; NISHIWAKI Mizuki; WATANABE Haruna
  BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN, 64, 4, 253, 257, The Volcanological Society of Japan, 31 Dec. 2019, [Lead author]
  Japanese
• Magnetotelluric transect of Unzen graben, Japan: conductors associated with normal faults
  Agnis Triahadini; Koki Aizawa; Yoshiko Teguri; Takao Koyama; Kaori Tsukamoto; Dan Muramatsu; Keita Chiba; Makoto Uyeshima
  Earth, Planets and Space, 71, 1, Springer Science and Business Media {LLC}, 01 Dec. 2019, [Peer-reviewed]
  Scientific journal
• Estimation of Vent Radii From Video Recordings and Infrasound Data Analysis: Implications for Vulcanian Eruptions From Sakurajima Volcano, Japan
  Dan Muramatsu; Koki Aizawa; Akihiko Yokoo; Masato Iguchi; Takeshi Tameguri
  Geophysical Research Letters, 45, 23, 12,829, 12,836, American Geophysical Union ({AGU}), 16 Dec. 2018, [Peer-reviewed], [Lead author], [International Magazine]
  Scientific journal
• 火山爆発に伴うインフラサウンドの研究と南極研究への応用に関する展望—Study of infrasound accompanied with volcanic explosions and prospects on its application to study of Antarctica—総特集 雪氷圏地震学(下)極域表層環境の新指標
  村松 弾; 松島 健; 相澤 広記
  月刊地球 = Chikyu monthly / 月刊地球編集部 編, 40, 10, 558, 564, 日野 : 海洋出版, Oct. 2018, [Lead author]
  Japanese

• Viscous-Flow-to-Fracture Transition in Linear Maxwell Fluids vs. Yield-Strength Materials: Implications for Magma Fracturing and Acoustic Emission
  Claudia Sánchez; Mie Ichihara; Dan Muramatsu, EGU General Assembly 2024, EGU24-5456, 19 Apr. 2024
  During magma ascent, the growth, ascent, and bursting of bubbles play a pivotal role, intricately linked with the rheological properties of magma. In the realm of this complexity, viscoelasticity stands out as a crucial factor influencing infrasound generation resulting from bubble bursting in volcanic systems. The linear Maxwell model, a fundamental representation of magma viscoelasticity, serves as a starting point for our investigation.In this study, we explore acoustic wave generation induced by bubble bursting in two distinct fluids: a Maxwell-type viscoelastic fluid (CTAB) and a Bingham-type yield-strength fluid (GEL). Despite both fluids exhibiting similar rigidity in the linear elastic regime, their fracture and flow behaviors diverge significantly. The acoustic signals generated by these fluids display pronounced variations, contingent upon factors such as flux (Q) and the depth of air injection (h).In the case of CTAB, bursting sounds are observed exclusively in the brittle regime at elevated Q, characterized by successive fractures within the fluid. At shallow injection depths, these fractures extend from the nozzle to the fluid surface, creating distinct acoustic waves. Deeper air injection results in crack growth, detachment from the nozzle, ascent to the surface, and subsequent acoustic wave generation. Interestingly, a round cavity, exclusive to small Q, does not produce acoustic waves.In contrast, GEL consistently forms a round air cavity, with the initial bursting being silent within the same range of Q and h as observed in CTAB. Brittle fractures are notably absent, and acoustic wave generation occurs only with continued air injection, indicating that rigidity alone does not dictate bursting sound; rather, it hinges on fluid brittleness and gas-flow conditions, including rate, depth, and injection history. This experimental exploration sheds light on the nuanced interplay between fluid properties and gas-flow dynamics in the context of acoustic wave generation during bubble bursting.           , Copernicus GmbH, English, Summary international conference
• Seismo-acoustic activities and surface hydrothermal phenomena at the South crater of Kirishima Iwo-Yama volcano
  村松弾; 市原美恵; 行竹洋平; 松島健; 田島靖久; 西村太志; 長妻努; 村田健史, 日本地球惑星科学連合大会予稿集(Web), 2024, 2024
• Long-term change in surface hydrothermal activities at the South craters of Kirishima Iwo-Yama volcano
  村松弾; 松島健; 長妻努; 村田健史; 西村太志; 畑誠斗; 田辺暖柊, 日本地球惑星科学連合大会予稿集(Web), 2023, 2023
• Anomalous surface hydrothermal activities observed on September 19, 2022 at the south creaters of Kirishima Iwo-Yama volcano
  長妻努; 村田健史; 菊田和孝; 村上雄樹; 松島健; 村松弾; 田辺暖柊; 西村太志, 日本地球惑星科学連合大会予稿集(Web), 2023, 2023
• Small seismic array and continuous video observation of gas emission activity at Iwo-yama Volcano, Kirishimayama
  畑誠斗; 西村太志; 松島健; 村松弾; 長妻努; 村田健史; 小園誠史; 田辺暖柊, 日本地球惑星科学連合大会予稿集(Web), 2023, 2023
• Small seismic array analysis of gas emission activity at Kirishima Iwo-Yama volcano
  Hata Masato; Nishimura Takeshi; Matsushima Takeshi; Muramatsu Dan; Nagatsuma Tsutomu; Murata Takeshi; Kozono Tomofumi; Tanabe Harutou, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2023, 88, 88, 2023
  The Volcanological Society of Japan, Japanese
• Consideration about the relation between the infrasonic spectral shape and temperature
  Yamakawa Kazuya; Yokoo Akihiko; Muramatsu Dan; Matsushima Takeshi; Ichihara Mie, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2023, 253, 253, 2023
  The Volcanological Society of Japan, Japanese
• Vulcanian eruption processes inferred from volcanic glow analysis at Showa crater, Sakurajima volcano
  Muramatsu Dan; Aizawa Koki; Yokoo Akihiko; Tameguri Takeshi; Iguchi Masato, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2023, 128, 128, 2023
  The Volcanological Society of Japan, Japanese
• Single Force Measurement Using a liquid jet from a PET Bottle
  Tada Ryuki; Ichihara Mie; Muramatsu Dan; Kuwano Osamu, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2023, 255, 255, 2023
  The Volcanological Society of Japan, Japanese
• Multi-parametric observation of intermittent hydrothermal discharge phenomenon observed at the west crater of Iwo-yama volcano, Kirishima Volcanic Complex, Japan
  Tanabe H.; Matsushima T.; Aizawa K.; Muramatsu D.; Aniya S.; Yoshinaga K.; Watanabe T., PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2022, 79, 79, 2022
  The Volcanological Society of Japan, Japanese
• Low-temperature test of new infrasound sensor manufactured by ACO and comparison with other models
  Muramatsu Dan; Ichihara Mie; Matsushima Takeshi; Kanao Masaki; Yamamoto Masa-yuki, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2022, 144, 144, 2022
  The Volcanological Society of Japan, Japanese
• UNDERSTANDING MAGMATIC SYSTEM OF UNZEN VOLCANO (NAGASAKI, SOUTHWEST JAPAN) INFERRED FROM BROAD-BAND MAGNETOTELLURIC OBSERVATION
  TRIAHADINI Agnis; AIZAWA Koki; HASHIMOTO Tasuku M.; UCHIDA Kazunari; YAMAMOTO Yuto; CHIBA Keita; MURAMATSU Dan; MIYANO Kanta; KAWAMURA Yuta; ANIYA Satoru; OKUBO Ayumu, 日本地球惑星科学連合大会予稿集(Web), 2021, 2021
• Electric self-potential change before and during the 2018 phreatic eruption of Iwo-Yama Volcano, Kirishima Volcanic Complex
  Aizawa Koki; Muramatsu Dan; Matsushima Takeshi; Koyama Takao; Uyeshima Makoto; Nakao Shigeru, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2021, 29, 29, 2021
  The Volcanological Society of Japan, Japanese
• Volcanic glow fluctuation prior to vulcanian explosions at Showa Crater, Sakurajima volcano
  Muramatsu Dan; Aizawa Koki; Yokoo Akihiko; Tameguri Takeshi; Iguchi Masato, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2021, 28, 28, 2021
  The Volcanological Society of Japan, Japanese
• Characteristics of the electrical resistivity structure of the Mt. Okue batholith
  Okubo A.; Aizawa K.; Matsushima T.; Triahadini A.; Yamamoto Y.; Tanabe H.; Utsugi M.; Yamazaki K.; Yoshimura R.; Komatsu S.; Araue K.; Namigishi A.; Teguri Y.; Tsukamoto K.; Muramatsu D.; Hayashida Y.; Takeishi K.; Ogata M.; Watanabe H.; Fujimori K.; Harada N., PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2021, 150, 150, 2021
  The Volcanological Society of Japan, Japanese
• Active Seismic Source Experiment in Sakurajima Volcano in 2019 and Comparison with the Previous Experiments
  NAKAMICHI, Haruhisa; YAMAMOTO, Keigo; YAMADA, Taishi; TAMEGURI, Takeshi; TAKAHASHI, Kousuke; AOYAMA, Hiroshi; YAMAMOTO, Mare; NOGAMI, Kenji; OIKAWA, Jun; MAEDA, Yuta; OHKURA, Takahiro; MATSUSHIMA, Takeshi; YAKIWARA, Hiroshi; SUGAHARA, Michitomo; TSUKAMOTO, Kaori; KISHIMOTO, Hiroshi; KUDO, Naoki; YAMAMURA, Takuya; HIRAHARA, Satoshi; YAGI, Takeo; HORIKAWA, Shinichiro; YOSHIKAWA, Shin; SONODA, Tadaomi; NAKATANI, Yukihiro; HIRANO, Shuichiro; MIYAMACHI, Hiroki; TANAKA, Yuki; YOSHIDA, Hideomi; NISHIKAWA, Sora; KAI, Takeru; TAKAHASHI, Ryuhei; TANOUE, Kazushi; KAWABE, Satoshi; WAKABAYASHI, Tamaki; MURAMATSU, Dan; HASHIMOTO, Tasuku; OSUGA, Keishi, Disaster Prevention Research Institute Annuals. B, 63, B, 100, 107, Dec. 2020
  We conducted an active seismic experiment in Sakurajima volcano in December 2019, three years after the similar experiment that was conducted in 2016. We deployed 185 temporary seismic stations, most of which were installed at the same place as in 2013 and 2016. Eight and two explosive shots with 20 and 100 kg charges, respectively, were detonated in December 5, 2019. The 2019 shot locations differ from 0.4 to 12 m from the corresponding previous shot locations. We successively observed the all explosions during nighttime nine hours continuous recording. We examine reflection phases on the seismic records that obtained by the previous and 2019 experiment to detect temporal change of subsurface seismic structure beneath Sakurajima volcano., 京都大学防災研究所, Japanese
• Analysis of infrasound accompanying the 2018 small phreatic eruption from Kirishima Iwo-yama
  Muramatsu Dan; Matsusima Takeshi; Iwasa Yuichi; Ichihara Mie, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2019, 0, 10, 10, 2019
  The Volcanological Society of Japan, Japanese
• Pressure source under Iwo-yama, Kirishima Volcanoes derived from GNSS campaign observation （Aug. ,2017 - Aug. ,2018）
  KOGA Yuki; MATSUSHIMA Takeshi; UCHIDA Kazunari; MURAMATSU Dan; WATANABE Saki; ISODA Kenshin; IWASA Yuichi, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2018, 0, 178, 178, 2018
  The Volcanological Society of Japan, Japanese
• Broad-band magnetotelluric observation at Kirishima volcanoes, Japan
  Aizawa Koki; Kanda Wataru; Kaori Seki; Utsugi Mitsuru; Koayama Takao; Uyeshima Makoto; Tsukamoto Kaori; Triahadini A.; Muramatsu Dan; Hayashida Yuto; Yuasa Yuhei; Luthfian A.; Teguri Yoshiko; Takeishi Kosuke, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2018, 0, 164, 164, 2018
  The Volcanological Society of Japan, Japanese
• Time variations between shock wave and a subsequent formation of bright cloud at Vulcanian eruptions of Showa crater, Sakurajima volcano, Japan
  MURAMATSU Dan; AIZAWA Koki; YOKOO Akihiko; IGUCHI Masato; TAMEGURI Takeshi, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2017, 0, 191, 191, 2017
  The Volcanological Society of Japan, Japanese

• 霧島硫黄山南火口における地震・空振活動と表面現象
  村松 弾; 市原 美恵; 行竹 洋平; 松島 健; 田島 靖久; 西村 太志; 長妻 努; 村田 健史
  日本地球惑星科学連合2024年大会, May 2024
• 火山現象に伴うパルス状音波の理解に向けた気泡破裂アナログ実験
  村松 弾; 市原 美恵; 桑野 修
  日本地球惑星科学連合2024年大会, May 2024
• 霧島硫黄山南火口群における表面活動の長期的変化
  村松 弾; 松島 健; 長妻 努; 村田 健史; 西村 太志; 畑 誠斗; 田辺 暖柊
  日本地球惑星科学連合2023年大会, May 2023
• Mechanism of pulse-like infrasound accompanying 2018 phreatic eruption of Iwo-Yama volcano, Kirishima Volcanic Complex, Japan
  Dan Muramatsu; Mie Ichihara; Takeshi Matsushima; Osamu Kuwano; Yashuhisa Tajima
  IAVCEI Scientific Assembly 2023, Jan. 2023, Poster presentation
• Temporal change in volcanic glow prior to vulcanian eruptions at Showa Crater of Sakurajima volcano, Japan
  Dan Muramatsu; Koki Aizawa; Akihiko Yokoo; Takeshi Tameguri; Masato Iguchi
  JpGU annual meeting 2022, May 2022
• 桜島昭和火口のブルカノ式噴火に先行する火映変動現象の解析
  村松弾; 相澤広記; 横尾亮彦; 井口正人
  日本地球惑星科学連合2021年大会, Jun. 2021, Oral presentation
• 霧島硫黄山の2018年4月19日水蒸気噴火に伴うパルス状空振のメカニズム
  村松弾; 松島健; 市原美恵
  JpGU-AGU Joint Meeting 2020 (Virtual), Jul. 2020, Japanese, Poster presentation
• Analysis of infrasound accompanying the 2018 small phreatic eruption from Iwo-yama volcano, Kirishima Volcanic Complex, Japan
  Dan Muramatsu
  First Japan-Singapore Volcanology PhD Symposium, Oct. 2019, Oral presentation
• Initial Phase of Vulcanian Eruption at Showa Crater, Sakurajima Volcano, Japan: Insight from the Visual Movie and Infrasound Data
  Dan Muramatsu; Koki Aizawa; Akihiko Yokoo; Masato Iguchi; Takeshi Tameguri
  AOGS 15th annual meeting, Jun. 2018, English, Poster presentation
• 桜島昭和火口におけるブルカノ式噴火の初期段階について―可視映像および空振観測から得られる知見
  村松弾; 相澤広記; 横尾亮彦; 井口正人; 為栗健
  日本地球惑星科学連合2018年大会, May 2018, Japanese, Oral presentation
• 可視映像解析による桜島昭和火口におけるブルカノ式噴火の衝撃波及び噴煙の時間関係
  村松弾; 相澤広記; 横尾亮彦
  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, Poster presentation

• Apr. 2017 - Present
  Japan Geoscience Union
• Jun. 2016 - Present
  The Volcanological Society of Japan

• 火山噴火に伴うパルス状空振の励起プロセスの理解：室内実験によるアプローチ
  科学研究費助成事業
  25 Apr. 2023 - 31 Mar. 2026
  村松 弾
  日本学術振興会, 特別研究員奨励費, 東京大学, 23KJ0357
• ブルカノ式噴火のトリガー解明
  科学研究費助成事業 特別研究員奨励費
  24 Apr. 2020 - 31 Mar. 2022
  村松 弾
  今年度は（１）桜島昭和火口における火映変動現象の解析と（２）機動的映像観測システムの開発を中心に実施した。（１）火映変動現象について、前年度の成果としてブルカノ式噴火の爆発１-２秒前に発生する空振を伴う変動（短周期変動）と、噴火開始の数十秒前に始まる緩やかな変動（長周期変動）を見出した。今年度はこれらの現象の整理とメカニズムの考察を進めるために対象期間・イベント数を2011-2015年の90件に増やした。その結果、空振を伴う短周期変動が起こるイベントは全体の３割ほどであるのに対し、長周期変動はほぼ全てのイベントで見られる現象であることがわかった。短周期変動は画像解析から顕著な温度上昇を伴うことが示唆され、爆発直前の火口底での亀裂開口がメカニズムとして考えられる。一方、長周期変動の開始時刻は噴火3秒-5.5分前と幅があり、噴気増加による火映の発達が原因として考えられる。また、長周期変動の時間スケールは先行研究で報告されている噴火前の山体収縮と調和的であり、火道からのガス漏れに対応している可能性がある。以上の結果から、噴火前数秒から数分の時間スケールで起こるガス漏れ（火映の長周期変動）が噴火開始過程において重要であること、また一部のイベントでは火口底での亀裂開口（火映の短周期変動）が爆発のトリガーであり、火道システムの最上部から噴火が開始する可能性が示唆された。後者については本研究で得られた新たな知見である。（２）機動的映像観測システムについては前年度に作成したプロトタイプの電源供給部分を改良し、野外でテスト観測を実施した。霧島硫黄山火山の火口極近傍において鉛蓄電池とソーラーパネルを使用した長期試験を実施し、３週間程度の試験期間で問題なく動作することが実証された。今後、国内外の火山でブルカノ式噴火が発生した際に機動観測を実施し（１）で考察したモデルの検証を行う。
  日本学術振興会, 特別研究員奨励費, 九州大学, 20J10734

• 第60次南極地域観測隊 特別鼎談「地球の果て、南極の地で学んだ支え合いの精神。」
  Oct. 2019
  Other than myself
  九大広報 Vol. 116, [Pr]
• 氷雪の大地へ 南極観測隊同行記＜下＞
  25 May 2019
  Myself
  大分合同新聞
  夕刊11面, [Paper]
• 氷雪の大地へ 南極観測隊同行記＜中＞
  24 May 2019
  Myself
  大分合同新聞
  夕刊11面, [Paper]
• 氷雪の大地へ 南極観測隊同行記＜上＞
  22 May 2019
  Myself
  大分合同新聞
  夕刊11面, [Paper]
• 南極生活50日「毎日が学び」
  18 Mar. 2019
  Other than myself
  朝日新聞
  夕刊9面, [Paper]