2007年1月9日北海道網走沖の地震 (in Japanese)

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✏ 2007/1/15 掲載

概要

2007年1月9日午前5時12分に網走沖でマグニチュード(Mw)4.7の地震が発生し，北海道北見市常呂町で震度3の揺れが観測されました。防災科学技術研究所Hi-netによって決められた本震および余震の震源位置とF-netにより決められた本震の発震機構解，気象庁によって決められた1950年以降にこの地域で発生した50km以浅の地震の震源分布を図に示します。
この地震は北見大和堆の南端付近に位置し，深さは1.7kmとごく浅く，発震機構解は西北西－東南東方向に圧縮軸をもつ逆断層型でした。この地域の地震活動は少ないものの，1956年3月6日には今回の地震とほぼ同じ場所でマグニチュード6.3の地震が発生し，網走市で小さな津波が観測されています。

▼図1 防災科学技術研究所Hi-netによって決められた本震および余震の震源と, 気象庁によって決められた1950年以降にこの地域で発生した50km以浅の地震の震源分布
Hi-netによる震源と、気象庁による1950年以降の震源分布

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