地震 第2輯
Online ISSN : 1883-9029
Print ISSN : 0037-1114
2004年新潟県中越地震の発生過程
オンライン合同余震観測結果から
飯尾 能久松本 聡松島 健植平 賢司片尾 浩大見 士朗澁谷 拓郎竹内 文朗西上 欽也廣瀬 一聖加納 靖之儘田 豊宮澤 理稔辰己 賢一和田 博夫河野 裕希是永 将宏上野 友岳行竹 洋平Bogdan ENESCU
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ジャーナル フリー

2006 年 58 巻 4 号 p. 463-475

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The 2004 Mid Niigata Prefecture Earthquake (MJMA 6.8) occurred on 23 October 2004. The mainshock was followed by four aftershocks with MJMA≥6.0. This earthquake is located in the Niigata-Kobe Tectonic Zone in which large strain rates (>0.1ppm/y contraction) have been observed by GPS data. We deployed three temporary online seismic stations in the aftershock area. Combining data from the temporary stations and from permanent stations around the aftershock area, we determined aftershock locations, and estimated the structures and the stress change in and around the aftershock region. Based on these results, we suggested a generating process of the 2004 Mid Niigata Prefecture Earthquake supposing that a very weak region exists in the weak zone in the lower crust just beneath the seismogenic fault.

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