セッション概要
| 固体地球科学 (S) | ||||
|---|---|---|---|---|
| セッション小記号 | 固体地球科学複合領域・一般 (CG) | |||
| セッション ID | S-CG63 | |||
| タイトル | Uncovering stress accumulation and fault strengthening of megathrust earthquakes | |||
| タイトル短縮名 | Stress and Strengthening in Megathrust | |||
| 代表コンビーナ | 氏名 | 小平 秀一 | ||
| 所属 | 海洋研究開発機構 | |||
| 共同コンビーナ 1 | 氏名 | 氏家 恒太郎 | ||
| 所属 | 筑波大学生命環境系 | |||
| 共同コンビーナ 2 | 氏名 | 久保田 達矢 | ||
| 所属 | 国立研究開発法人防災科学技術研究所 | |||
| 共同コンビーナ 3 | 氏名 | 日野 亮太 | ||
| 所属 | 東北大学大学院理学研究科 | |||
| 共同コンビーナ 4 | 氏名 | Matthew W Herman | ||
| 所属 | California State University Bakersfield | |||
| 共同コンビーナ 5 | 氏名 | Christine Regalla | ||
| 所属 | Northern Arizona University | |||
| セッション言語 | E | |||
| スコープ | In the 2011 Tohoku-Oki Earthquake, large fault slips exceeding 50 meters were observed near the trench axis, an area previously thought to experience stable sliding or aseismic slip during an earthquake cycle. Various methods, including geophysical surveys, observations, ocean drilling, experiments, and simulations, have been employed to clarify the mechanisms behind these shallow, large fault slips. However, the state of fault locking before and between earthquakes - critical to understanding fault slip - remains unclear. To answer this question based on data from the Tohoku-Oki and inland earthquakes, as well as theoretical and model studies, two contrasting hypotheses have been proposed: one suggests that mechanical locking in the shallow part of the plate boundary rapidly progresses after an earthquake, while the other posits that the shallow part remains mechanically unlocked throughout an earthquake cycle. A unified view on this issue has not yet been established. This session aims to address the fundamental problem in the earthquake generation process: how fault strength recovers and stress accumulates along the source fault of a subduction seismogenic zone. We also hope to use the session as an opportunity to share new knowledge about the geophysical and geological structure of the source faults of megathrust earthquakes, and their spatial variation along and across the subduction zone. We invite research presentations from a wide range of fields, including geophysics, geodesy, geology, petrology, geochemistry, drilling science, and both model and theoretical researches, with a focus on subduction seismogenic zones worldwide. |
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| セッション形式 | 口頭およびポスターセッション | |||