AIST


地震テクトニクス研究グループ
Seismotectonics Research Group


グループ概要

Group Overview


地震テクトニクス 　

地震テクトニクス 研究グループでは，自然地震・地殻変動の観測と解析，過去に地下深部で活動した断層帯の地質調査，岩石の摩擦や破壊を再現する室 内岩石実験，計算機上で地震を再現する数値シミュレーションなどの研究を有機的に連携させて，地震が発生する場や発生にいたるプ ロセスを解明する研究に取り組んでいます．近年は，機械学習を積極的に活用して，日本全国の基盤的なストレスマップの構築と，地 下断層形状の推定手法の開発を行っています．また，地殻の脆性–塑性遷移 領域での断層変形プロセスの解明にも取り組んでいます．さらに，プレート境界における歪エネルギーの蓄積と解放の収支の見積も り，およびそれに基づく地震発生の数値シミュレーションの効率化にも着手しています．これらの研究を通して，物理モデルに基づい た地震の規模と発生時期の予測技術の確立を目指しています．

seismotectonics 　
Our group aims to elucidate the physical and mechanical properties of the seismogenic zone and the generation processes of large earthquakes by integrating seismological observations and data analysis, geological studies of exhumed faults, laboratory experiments, and numerical modeling. In recent years, we have actively applied machine-learning techniques to construct a nationwide stress map of Japan and to develop methods for inferring the geometry of fault at depth. We are also investigating the deformation processes operating within fault rocks in the brittle–plastic transition zone. Furthermore, we are working on estimating the strain‑energy budget associated with accumulation and release along plate boundaries, and using these estimates to improve the efficiency of numerical simulations of earthquake generation processes. Our studies provide a basis for improving the accuracy of long-term forecasting and the evaluation of the magnitudes of future earthquakes.

お知らせ
LATEST INFORMATION


2025-11-27
論文発表のおしらせです．
An article was published.
Yasunori Sawaki, Takahiro Shiina, and Takahiko Uchide.
Steep intraplate reverse faulting adjacent to the hypocenter of the 1923 Kanto earthquake: the Mw 5.0 western Kanagawa earthquake in eastern Japan on 9 August 2024. Earth Planets Space, 77, 186, 2025.
https://doi.org/10.1186/s40623-025-02311-9
2025-11-04
International Joint Workshop on Slow-to-Fast Earthquake 2025（高知．9月24日-26日）に参加しました．（内出，寒河江）
Attended the International Joint Workshop on Slow-to-Fast Earthquake 2025 in Kochi. (Uchide and Sagae)
2025-11-04
日本地震学会秋季大会（福岡．10月20日‐22日）に参加しました． (内 出，堀川，椎名，寒河江，Admore）
Attended the Fall Meeting of the Seismological Society of Japan in Fukuoka. (Uchide, Horikawa, Shiina, Sagae, and Admore)
2025-09-19
日本地質学会第132年学術大会（熊本 9月14日-16日）に参加しました．（大橋，大森）
Attended the 132nd Annual Meeting of the Geological Society of Japan, held in Kumamoto on September 14-16 (Oohashi and Omori)
2025-07-02
論文発表のおしらせです．
An article was published.
Takahiro Shiina, Haruo Horikawa, Yasunori Sawaki, Kodai Sagae, and Kazutoshi Imanishi.
Aftershock distribution of the 2024 Noto Peninsula Earthquake, Japan, determined using a 3D velocity structure and uncertainty quantification. Earth, Planets, and Space, 130,  94, 2025.
https://doi.org/10.1186/s40623-025-02227-4
2025-06-02
日本地球惑星科学連合2025年大会（千葉 5月25日-30日）に参加しました．（内出，高橋，堀川，重松，椎名，大橋，寒河江，Admore，喜多，
大森）
Attended JpGU Meeting 2025 in Chiba on May 25-30 (Uchide, Takahashi, Horikawa, Shigematsu, Shiina, Ohashi, Sagae, Admore, Kita, and Omori)
2025-06-02
論文発表のおしらせです．
An article was published.
Kodai Sagae, Masayuki Kano, Suguru Yabe, and Takahiko Uchide
Machine learning-based detection and localization of tectonic tremors in the Japan trench. Journal of Geophysical Research: Solid Earth, volume 130, 2025, e2025JB031348, https://doi.org/10.1029/2025JB031348
2025-05-09
論文発表のおしらせです．
An article was published.
Thomas Yao, Norio Shigematsu, Simon R. Wallis, Keita Kobayashi, Chujie Zhang, and Kohtaro Ujiie
Evolution of nanocavities to ductile fractures in crustal-scale faults at the base of the seismogenic zone. Journal of Geophysical Research: Solid Earth, volume 130, 2025, e2024JB089868, https://doi.org/10.1029/2024JB029868
 
EOSのEditor's Highlightに選出されました． Featured as an Editor's Highlight on EOS
https://eos.org/editor-highlights/creep-cavitation-may-lead-to-earthquake-nucleation
2025-04-28
SSA 2025 Annual meeting（ボルティモア）に参加しました．(内出）
Attended SSA 2025 Annual meeting (Baltimore). (Uchide)
2025-04-02
論文発表のおしらせです．
An article was published.
Yasunori Sawaki, Takahiro Shiina, Kodai Sagae, Yoshihiro Sato, Haruo Horikawa, Ayumu Miyakawa, Kazutoshi Imanishi, and Takahiko Uchide
Fault geometries of the 2024 Mw 7.5 Noto Peninsula Earthquake from hypocenter-based hierarchical clustering of point-cloud normal vectors, Journal of Geophysical Research: Solid Earth, volume 130, 2025, e2024JB030233, 
https://doi.org/10.1029/2024JB030233
2025-04-01
佐 脇 泰典特別研究員が立命館大学に異動いたしました．
SAWAKI Yasunori, postdoctoral researcher, moved to Ritsumeikan University.
2025-03-21
AGU Fall Meeting 2024（ワシントンD.C.）に参加しました．(寒河江，佐脇, Admore）
Attended AGU Fall Meeting 2024 (Washington, D.C. ). (Sagae, Sawaki, and Admore)
2024-10-28
論文発表のおしらせです．
An article was published.
Yasunori Sawaki, Yoshihiro Ito, Emmanuel Soliman M. Garcia, Ayumu Miyakawa, and Takuo Shibutani
Deep plutonic bodies over low-frequency earthquakes revealed from receiver-side Green's functions, Tectonophysics, Volume 892, 6 December 2024, 230536,(Open Access)
 https://doi.org/10.1016/j.tecto.2024.230536
2024-10-23
日本地震学会秋季大会（新潟10月21日‐23日）に参加しました．(内出, 椎名，寒河江，佐脇, Admore）
Attended the Fall Meeting of the Seismological Society of Japan in Niigata. (Uchide, Shiina, Sagae, Sawaki and Admore)
2024-09-19
International Workshop on Slow-to-Fast Earthquakes 2024（別府）に参加しました．（寒河江,佐脇）
Attended International Workshop on Slow-to-Fast Earthquakes 2024  (Beppu). ( Sagae, Sawaki)
2024-09-08
日本地質学会第131年学術大会（山形）に参加しました．（大橋，喜多，大森）
Attended the 131th Annual Meeting of the Geological Society of Japan (Yamagata). ( Ohashi, Kita, and Omori)
2024-07-23
Takahiro Shiina, Yuta Amezawa, Haruo Horikawa, Kazutoshi Imanishi, Takahiko Uchide, Deep crustal fluids and their relation to cutoff depths of crustal earthquakes in the North Ibaraki area of northeastern Japan inferred from reflected S-waves, Tectonophysics, Volume 885, 22 August 2024, 230415,
https://doi.org/10.1016/j.tecto.2024.230415
2024-05-31
日本地球惑星科学連合2024年大会 （千 葉 5月26日 -31日）に参加しまし た． （高橋，重松，堀川, 浦田，椎名, 寒河江, 佐脇, Admore）
Attended JpGU Meeting 2024 in Chiba on May 26-31 (Takahashi, Shigematsu, Horikawa, Urata, Shiina, Sagae, Sawaki, and Admore)
2024-04-11
Manami Kitamura, Miki Takahashi, Norio Shigematsu, Slow failure during faulting and formation of a porous framework under hydrothermal conditions: Role of feldspar sintering in granitoids,Geothermics,Volume 120, 2024, 102995,
https://doi.org/10.1016/j.geothermics.2024.102995
2024-04-11
Qi Wang , Takamoto Okudaira, Norio Shigematsu, 2024, Dominant slip systems of quartz under lower amphibolite-facies conditions identified from microstructures and CPOs in quartz phenocrysts. Journal of Structural Geology, 105106/
https://doi.org/10.1016/j.jsg.2024.105106