活断層研究
Online ISSN : 2186-5337
Print ISSN : 0918-1024
ISSN-L : 0918-1024
1998年9月3日岩手県雫石町に発生した地震(M6.1)の余震分布
海野 徳仁岡田 知己中村 綾子中島 淳一佐藤 俊也堀修 一郎河野 俊夫仁田 交市植木 貞人松澤 暢長谷川 昭浜口 博之
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1998 年 1998 巻 17 号 p. 1-8

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An earthquake of magnitude 6.1 occurred in Shizukuishi town, Iwate prefecture, northeastern Japan, on September 3,1998. The focal area of this event is located near Iwate volcano, which has been active since February,1998. The focal mechanism of the main shock is a reverse fault, whose pressure axis is nearly horizontal and almost east-west-a typical focal mechanism for shallow earthquakes beneath the northeastern Japan arc. Precise hypocenter locations of the main shock and its aftershocks delineate a fault plane that strikes northeast and dips northwest in the depth range 3-8km. The rupture probably began about 7km deep at the northern edge of the fault plane, then propagated southward along a deep part of the Nishine active fault.

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