日本地球惑星科学連合2025年大会
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-CG50 | |||
| タイトル | Earthquakes, Tsunamis, Seismotectonics, and Hazard Potential of the Ryukyu Trench and Okinawa Trough | |||
| タイトル短縮名 | Ryukyu Trench and Okinawa Trough | |||
| 開催日時 | 口頭セッション | 5/28(水) PM1-PM2 | ||
| 現地ポスター コアタイム |
5/28(水) PM3 | |||
| 代表コンビーナ | 氏名 | 佐竹 健治 | ||
| 所属 | 東京大学地震研究所 | |||
| 共同コンビーナ１ | 氏名 | 中村 衛 | ||
| 所属 | 琉球大学理学部 | |||
| 共同コンビーナ２ | 氏名 | CHANG PINGYU | ||
| 所属 | National Central University, Taiwan | |||
| 共同コンビーナ３ | 氏名 | J. Bruce H. Shyu | ||
| 所属 | National Taiwan University | |||
| セッション言語 | E | |||
| スコープ |
Along the Ryukyu trench between Kyushu and Taiwan, the Philippine Sea plate subducts beneath the Eurasian Plate with a rate of approximately 8 cm/year. Unlike the neighboring Nankai Trough, the history of great interplate earthquakes is not well known, except for the enigmatic 1771 Meiwa earthquake, which caused more than 10,000 casualties due to tsunami. The Hualien earthquake on April 3, 2024 (M 7.4) originated from this plate boundary, causing the worst earthquake damage to Taiwan since the 1999 Chi-chi earthquake. The Hualien earthquake also prompted a tsunami warning in Ryukyu Islands, Japan.
The Okinawa Trough, which is located on the northwest side of the Ryukyu Arc, is currently in the early stages of back-arc rifting. Associated with the rifting, seismic swarm activity and hydrothermal activity are also active within the trough. However, the mechanism of the Okinawa Trough's extension is still unknown.
The geodetic measurements on the Ryukyu islands indicate that the plate coupling is very weak, while recent offshore geodetic measurements indicate coupled patches along the megathrust. Slow earthquakes have been observed along the Ryukyu trench.
In order to exchange current knowledge on the Ryukyu trench and stimulate further collaboration between Taiwan and Japan, we propose a joint session between Chinese Geoscience Union in Taiwan (TCGU) and JpGU. This session solicits recent studies on earthquakes, tsunamis or seismotectonics. Possible topics include, but not limited to, studies of the 2024 Hualien earthquake and its tsunami, recent geophysical observations of slow or regular earthquakes, studies of past earthquakes in the region, Probabilistic Seismic Hazard Assessments of the region.
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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 | |||
| 共催情報 | 学協会 | - | ||
| ジョイント | TCGU | |||
| 団体会員以外の組織との共催 | - | |||
| 国際連携団体 | - | |||