Researcher basic information

• Ph.D, The University of Tokyo, Mar. 2023

• https://researchmap.jp/fuku-s?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202401017365123824
• https://orcid.org/0000-0002-9522-9144

• 11001678

• https://orcid.org/0000-0002-9522-9144

• 202401017365123824

• 海域地震学
• 海底地震計
• 光ファイバセンシング

• Natural Science, Solid earth sciences, 海域地震学

Research activity information

• Mar. 2023, 日本地震学会, 2023年度日本地震学会論文賞
  Detailed S-wave velocity structure of sediment and crust off Sanriku, Japan by a new analysis method for distributed acoustic sensing data using a seafloor cable and seismic interferometry
  Shun Fukushima,Masanao Shinohara, Kiwamu Nishida, Akiko Takeo, Tomoaki Yamada, Kiyoshi Yomogida
• May 2022, 日本地球惑星科学連合, 学生優秀発表賞
  Development of seismic interferometry analysis for DAS data on a seafloor cable to determine shallow S-wave velocity structure with spatially high resolution.
  福島駿
• Nov. 2021, 日本地震学会, 学生優秀発表賞
  三陸沖光ケーブル観測システムのDistributed Acoustic Sensingデータを用いたレイリー波位相速度の計測
  福島駿
• Feb. 2021, 北海道大学, 北海道大学大学院理学院優秀研究奨励賞
  福島駿

• Spatial distribution of Vp/Vs for sediment and crust off Sanriku, Japan, using distributed acoustic sensing data
  Shun Fukushima; Masanao Shinohara; Akiko Takeo
  Progress in Earth and Planetary Science, 21 May 2026
  Scientific journal
• 3D Traveltime Tomography Using Ocean-bottom DAS Data
  Bhaskar Illa; Shun Fukushima; Masanao Shinohara
  Geophysical Journal International, Oxford University Press (OUP), 16 Apr. 2026
  Scientific journal, Summary
  
  The Sanriku-Oki subduction region in northeastern Japan is a tectonically active zone where the Pacific Plate subducts beneath the Okhotsk Plate, generating frequent earthquakes. In this study, we present a three-dimensional unstructured S-wave traveltime tomography model of the off-Sanriku forearc using local earthquake data recorded by ocean-bottom Distributed Acoustic Sensing (DAS). The dense spatial sampling provided by DAS enables cost-effective, high-resolution imaging of the forearc region that is difficult to achieve with conventional ocean-bottom seismometer deployments. Eight local earthquakes recorded near the DAS cable provided 209,193 high-quality S-wave arrival times after applying data-selection criteria. These earthquakes were recorded using two DAS interrogator units: the AP Sensing N5200A (70 km coverage, 5 m channel spacing) and the OptaSense QuantX (100 km coverage, 2 m channel spacing). The initial reference models were constructed on a 3D tetrahedral mesh with target cell sizes of 1.5 and 3.0 km, accurately incorporating the DAS cable geometry and earthquake hypocentres. Synthetic traveltimes were efficiently computed using the Fast Sweeping Method (FSM) and the traveltime models were subsequently refined through traveltime inversion. The resulting S-wave tomography models reveal significant spatial heterogeneity within the off-Sanriku forearc region. Low S-wave velocities (Vs ∼ 0.78–0.85km s−1) indicate shallow, unconsolidated Neogene sediments, underlain by higher velocities in the Cretaceous basement (Vs ∼ 1.2–2.4km s−1). The lower crust and uppermost mantle wedge exhibit clear along-strike segmentation of the forearc. In the landward domain, high S-wave velocities in the lower crust (4.15–4.4km s−1) and uppermost mantle (4.6–4.65km s−1) indicate a mechanically strong overriding plate and a thick, cold mantle wedge, with no evidence of significant partial melting or serpentinisation associated with subduction processes. In contrast, the central offshore region exhibits moderately reduced S-wave velocities (3.9–4.1km s−1), suggesting a mechanically weaker overriding plate. Toward the trench, S-wave velocities decrease markedly within the forearc crust, defining a low velocity zone associated with crust–crust interaction above the subducting Pacific Plate and likely reflecting fluid-rich, deformed forearc material in the shallow subduction environment.
• Analytical expression for cross-spectrum of ambient-noise surface waves in distributed acoustic sensing with multiple or winding cables
  Shun Fukushima; Kiwamu Nishida; Akiko Takeo; Ryota Takagi
  Geophysical Journal International, 10 Mar. 2026
  Scientific journal
• Seismic Observations by Distributed Acoustic Sensing Using Seafloor Cable Observation Systems Around Japanese Islands
  Masanao Shinohara; Shin Aoi; Shun Fukushima; Tomoaki Yamada; Tetsuya Takeda; Takashi Kunugi; Kenji Uehira; Masashi Mochizuki; Takeshi Akuhara; Kimihiro Mochizuki; Shin'ichi Sakai
  OCEANS 2025 - Great Lakes, 1, 7, IEEE, 29 Sep. 2025
  International conference proceedings
• Enhanced P-wave velocity imaging by marine airgun-source seismic surveys with distributed acoustic sensing
  Shun Fukushima; Masanao Shinohara; Tomoaki Yamada; Ryota Hino; Ryosuke Azuma; Yoshihiro Ito; Yusuke Yamashita; Hiroki Takano
  Scientific Reports, 15, 1, Springer Science and Business Media LLC, 24 May 2025
  Scientific journal
• Distributed Acoustic Sensing Observation Using Seafloor Cable Observation System in the Japan Sea
  Masanao Shinohara; Tomoaki Yamada; Shun Fukushima; Hiroaki Yamahana
  2025 IEEE Underwater Technology (UT), 1, 5, IEEE, 02 Mar. 2025
  International conference proceedings
• Retrieval and precise phase-velocity estimation of Rayleigh waves by the spatial autocorrelation method between distributed acoustic sensing and seismometer data
  Shun Fukushima; Masanao Shinohara; Kiwamu Nishida; Akiko Takeo; Tomoaki Yamada; Kiyoshi Yomogida
  Geophysical Journal International, 07 Mar. 2024
  Scientific journal
• Detailed S-wave velocity structure of sediment and crust off Sanriku, Japan by a new analysis method for distributed acoustic sensing data using a seafloor cable and seismic interferometry
  Shun Fukushima; Masanao Shinohara; Kiwamu Nishida; Akiko Takeo; Tomoaki Yamada; Kiyoshi Yomogida
  Earth, Planets and Space, 74, 1, Springer Science and Business Media {LLC}, Dec. 2022
  Scientific journal

• Seismic observation using the seafloor optical fiber cable with distributed acoustic sensing in the Japan Sea
  篠原雅尚; 山田知朗; 八木健夫; 増田正孝; 橋本匡; 阿部英二; 福島駿; 山花弘明, 日本地球惑星科学連合大会予稿集(Web), 2024, 2024
• Estimation of P-wave velocity and Vp/Vs structure of upper crust off Sanriku, Japan by distributed acoustic sensing data
  福島駿; 福島駿; 篠原雅尚; 望月公廣; 山田知朗; 日野亮太; 東龍介; 伊藤喜宏; 山下裕亮, 日本地震学会秋季大会講演予稿集(CD-ROM), 2023, 2023
• Detailed P-wave velocity structure of the sedimentary layers and uppermost crust off Sanriku using DAS, OBS and controlled seismic sources.
  福島駿; 福島駿; 篠原雅尚; 望月公廣; 山田知朗; 日野亮太; 東龍介; 伊藤喜宏; 山下裕亮, 日本地球惑星科学連合大会予稿集(Web), 2023, 2023

• From Surface to Layered Structure: Insights into Plate Boundary Earthquakes from Dense Seismic Observations
  Grants-in-Aid for Scientific Research
  01 Apr. 2026 - 31 Mar. 2030
  悪原 岳; 高木 涼太; 東 龍介; 福島 駿; 山谷 里奈
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 26K00803
• 海底光ファイバDASによる巨大津波観測手法の開拓
  科学研究費助成事業
  26 Jun. 2026 - 31 Mar. 2029
  山中 悠資; 福島 駿
  日本学術振興会, 挑戦的研究(萌芽), 北海道大学, 26K22362
• 統合先端地震観測による桜島火山・姶良カルデラ下のマグマ供給系の幾何構造解明
  科学研究費助成事業
  01 Apr. 2026 - 31 Mar. 2029
  福島 駿
  日本学術振興会, 若手研究, 北海道大学, 26K17244
• 超稠密地震観測網の新規構築による有珠山の高分解能地震波速度構造推定と微小地震活動把握：マグマ供給系の幾何構造解明へ向けた取り組み
  Apr. 2026 - Mar. 2028
  福島駿
  東北大学, 即戦力となる火山人材育成プログラム, Principal investigator
• 海域S波速度構造推定の新展開：浅部スロー地震の構造要因解明への取り組み
  科学研究費助成事業
  31 Jul. 2024 - 31 Mar. 2026
  福島 駿
  日本学術振興会, 研究活動スタート支援, 東北大学, 24K22892