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タイトル: The 1999 Chi-Chi, Taiwan Earthquake : A Subduction Zone Earthquake on Land
その他のタイトル: 1999年台湾集集地震 : 陸上にのりあげた海溝系地震
著者: Seno, Tetsuzo
Otsuki, Kenshiro
Yang, Chao-Nan
著者(別言語): 瀬野, 徹三
大槻, 憲四郎
楊, 昭雄
キーワード: Chi-Chi earthquake
tsunami earthquake
発行日: 2000年9月22日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第75冊第1号, 2000.9.22, pp. 57-77
抄録: The Chi-Chi earthquake occurred at the thrust-decollement in the accretionary prism of a young collision zone in central Taiwan. This event is thus not different from a subduction zone earthquake if Taiwan were covered by the sea water. The surface ruptures were accompanied by little damage except for the collapse of buildings standing across the surface faults. The slip directions of the surface faults were mostly NW, which is consistent with the earthquake slip vector, but there were also many W-SW and N directed slips. At the northwest corner of the earthquake fault, significant uplifts and multiple thrusts in the river bed occurred. These might all be related to the fact that the shallow portion of the earthquake fault cut the weak accretionary prism and the sediment on it. The uplifts at the northwestern corner imply an abnormal tsunami if the area were under the sea, thus suggesting a new factor for the mechanism of tsunami earthquakes: deformation of the sediment or weak accretionary prism at the lowest trench slope (Seno, 2000). The Chi-Chi earthquake might provide a unique chance to observe a subduction earthquake on land.
URI: http://hdl.handle.net/2261/13184
ISSN: 00408972


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