Solid Earth Sciences (S) | ||
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Session Sub-category | Complex & General(CG) | |
Session ID | S-CG50 | |
Title | Earthquakes, Tsunamis, Seismotectonics, and Hazard Potential of the Ryukyu Trench and Okinawa Trough | |
Short Title | Ryukyu Trench and Okinawa Trough | |
Main Convener | Name | Kenji Satake |
Affiliation | Dept. Earth Sciences, National Central University, Taiwan | |
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 |
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Scope |
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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Presentation Format | Oral and Poster presentation | |
Joint Session with | CGU | |
Invited Authors |
Kuo-Fong Ma (Institute of Earth Sciences, Academia Sinica, Taiwan) Yushiro Fujii (International Institute of Seismology and Earthquake Enginnering, Building Research Institute) Mamoru Nakamura (Faculty of Science, University of the Ryukyus) Ryoya Ikuta (Faculty of Science, Shizuoka University) Cheng-Hung CHEN (Department of Geosciences, National Taiwan University) Pei-Ru Jian (Department of Geosciences, National Taiwan University) |
Time | Presentation No | Title | Presenter |
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Oral Presentation May 28 PM1 | |||
13:45 - 14:00 | SCG50-01 | Earthquakes, Tsunamis, Seismotectonics, and Hazard Potential of the Ryukyu Trench and Okinawa Trough - Introduction | Kenji Satake |
14:00 - 14:15 | SCG50-02 | A Comparative Analysis of the November 14, 1986, and April 2, 2024, Hualien, Taiwan earthquakes: Seismic Source Characteristics and Regional Impacts | Kuo-Fong Ma |
14:15 - 14:30 | SCG50-03 | Spatiotemporal Patterns of the April 2, 2024, Hualien Earthquake Sequence and Finite Fault Solutions of Significant Aftershocks | Yopi Ruben Serhalawan |
14:30 - 14:45 | SCG50-04 | Tsunami simulation for the Hualien, Taiwan earthquake (M7.4) on April 3, 2024 | Yushiro Fujii |
14:45 - 15:00 | SCG50-05 | Source mechanism and early warning of volcanic tsunamis | Tony Song |
15:00 - 15:15 | SCG50-06 | Develop new numerical method CGM to simulate landslides and enhance the description of turbidity suspension phenomena | Cheng-Hao Yeh |
Oral Presentation May 28 PM2 | |||
15:30 - 15:45 | SCG50-07 | Decadal-Scale Changes in Very Low-Frequency Earthquake Activity in the Southwestern Ryukyu Trench | Mamoru Nakamura |
15:45 - 16:00 | SCG50-08 | Lack of inter-plate coupling along the southern end of the Ryukyu trench deduced from GNSS-A geodetic measurements | Ryoya Ikuta |
16:00 - 16:15 | SCG50-09 | The Offshore Seismogenic Structure Database in Northeast Taiwan | Cheng-Hung CHEN |
16:15 - 16:30 | SCG50-10 | The New Ryukyu Area CMT (RACMT) Catalog: Implications for Ryukyu Subduction Zone Rupture Behavior | Pei-Ru Jian |
16:30 - 16:45 | SCG50-11 | Long-term vertical deformations in the Ryukyu subduction zone, Japan | Sophie Debaecker |
16:45 - 17:00 | SCG50-12 | Analysis of Subsurface Fault Systems Using Audio-Magnetotelluric Surveys in the Western Ilan Plain , the tip of the extension of Okinawa Trough | CHANG PINGYU |
Presentation No | Title | Presenter |
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Poster Presentation May 28 PM3 | ||
SCG50-P01 | Analysis of Spatiotemporal variation of the earthquake swarms in the Okinawa Trough by using Matched filter method | Yuji Abe |
SCG50-P02 | Improved sedimentary layer model including the accretionary prism in the fore-arc region of Ryukyu arc, Japan | Masanao Komatsu |
SCG50-P03 | Reconstructing relative sea-level changes on Kikaijima Island from coral microatolls: Implications for megathrust earthquake potential along the Ryukyu Trench | Junki Komori |
SCG50-P04 | Coupled Dynamics of Internal Waves and Submarine Landslides in the Formation of Nepheloid Layers | Che-Han Chang |