JpGU Meeting 2025
Session Outline| Solid Earth Sciences (S) | ||||
|---|---|---|---|---|
| Session Sub-category | Complex & General (CG) | |||
| Session ID | S-CG50 | |||
| Session Title | Earthquakes, Tsunamis, Seismotectonics, and Hazard Potential of the Ryukyu Trench and Okinawa Trough | |||
| Short Title | Ryukyu Trench and Okinawa Trough | |||
| Date & Time | Oral Session |
PM1-PM2 Wed, 28 MAY | ||
| On-site Poster Coretime |
PM3 Wed. 28 MAY | |||
| Main Convener | Name | Kenji Satake | ||
| Affiliation | Earthquake Research Institute, University of Tokyo | |||
| Co-Convener 1 | Name | Mamoru Nakamura | ||
| Affiliation | Faculty of Science, University of the Ryukyus | |||
| Co-Convener 2 | Name | CHANG PINGYU | ||
| Affiliation | National Central University, Taiwan | |||
| Co-Convener 3 | Name | J. Bruce H. Shyu | ||
| Affiliation | National Taiwan University | |||
| Session Language | E | |||
| Scope (Session Description) |
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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| Session Format | Orals and Posters session | |||
| Co-sponsorship | Partner Union(s) | TCGU | ||
| JpGU Society Member(s) | - | |||
| International Collaborative Society | - | |||
| Organizations Other Than JpGU Society Members | - | |||