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タイトル: Aftershock Distribution of the 1993 M6.6 Earthquake Off Noto Peninsula and its Relation to Tectonic Features
その他のタイトル: 1993年能登半島沖地震(M6.6)の余震分布とテクトニクスの関係
著者: TSUKUDA, Tameshige
WADA, Hiroo
SAKAI, Kaname
ITO, Kiyoshi
著者(別言語): 佃, 為成
和田, 博夫
酒井, 要
伊藤, 潔
発行日: 1994年9月30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69冊第1/2号, 1994.9.30, pp. 1-18
抄録: An M6.6 earthquake occurred on February 7,1993, around a sea rise extending southwest-northeast direction off the northeastern tip of Noto Peninsula. The hypocenters of the mainshock and aftershocks were located using telemetered data from university stations. The aftershocks during the first two days are concentrated in the narrow active fault zone along the northwest side of the rise. Other concentrations occurred along active faults on the southeast side of the rise. Most of the focal depths are 10-15km, consistent with the interpretation of T phases and pP phases recorded at some stations. Northwestward dipping 3-dimensional distributions for large aftershocks suggest two possible fault planes, which coincide well with the two fault planes of the CMT solution. The gross nature of the seismic fault is of a thrust type, which contradicts the strike slip solution estimated from the initial motions. The Noto region is part of the tectonic zone along the eastern margin of the Japan Sea, where zonal shortening due to compression is predominant as in the Japan Sea coast region in northern Honshu, Japan. The alignment of aftershocks along the topographic lineaments and submarine active faults may reflect this tectonism.
URI: http://hdl.handle.net/2261/13122
ISSN: 00408972


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