English

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 IDS-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
 現地口頭会場 106
現地
ポスター
コアタイム		 5/28(水) PM3 現地ポスター会場 展示場ホール7・8
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.
発表方法 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 -
招待講演 Ma Kuo-Fong（Institute of Geophysics, National Central University, Taiwan, ROC）
藤井 雄士郎（国立研究開発法人 建築研究所 国際地震工学センター）
中村 衛（琉球大学理学部）
生田 領野（静岡大学理学部）
Cheng-Hung CHEN（Department of Geosciences, National Taiwan University）
Pei-Ru Jian（Department of Geosciences, National Taiwan University）
時間 講演番号 タイトル 発表者
口頭発表 5月28日 PM1
13:45 - 14:00 SCG50-01 Earthquakes, Tsunamis, Seismotectonics, and Hazard Potential of the Ryukyu Trench and Okinawa Trough - Introduction 佐竹 健治
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 Ma Kuo-Fong
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 台湾の花蓮市付近で2024年4月3日に発生した地震（M7.4）の津波シミュレーション 藤井 雄士郎
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
口頭発表 5月28日 PM2
15:30 - 15:45 SCG50-07 Decadal-Scale Changes in Very Low-Frequency Earthquake Activity in the Southwestern Ryukyu Trench 中村 衛
15:45 - 16:00 SCG50-08 GNSS-Aにより明らかになった琉球海溝南端部のプレート間カップリングの欠如 生田 領野
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
講演番号 タイトル 発表者
ポスター発表 5月28日 PM3
SCG50-P01 Matched filter 法を用いた沖縄トラフにおける
群発地震の時空間変動の解析 		安部 祐志
SCG50-P02 南西諸島前弧域における付加体を含む地盤構造モデルの改良 小松 正直
SCG50-P03 Reconstructing relative sea-level changes on Kikaijima Island from coral microatolls: Implications for megathrust earthquake potential along the Ryukyu Trench 小森 純希
SCG50-P04 Coupled Dynamics of Internal Waves and Submarine Landslides in the Formation of Nepheloid Layers Che-Han Chang