地震 第2輯
Online ISSN : 1883-9029
Print ISSN : 0037-1114
論説
小繰り返し地震解析による宮城・福島県沖プレート境界の準静的すべり
内田 直希松澤 暢三浦 哲平原 聡長谷川 昭
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ジャーナル フリー

2007 年 59 巻 4 号 p. 287-295

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Spatio-temporal distribution of quasi-static slip on the plate boundary east off Miyagi and Fukushima prefectures, NE Honshu, Japan is estimated by using small repeating earthquake data. The analysis of small repeating earthquakes has advantages of relatively high spatial resolution, especially near the trench, and the availability of long-term data (22 years) compared to GPS data. The results show that the repeating earthquakes are distributed outside the coseismic slip areas (asperities) of large earthquakes, showing that fault creep is dominant outside the asperities. The cumulative slip (slip histories) of small repeating earthquake groups reveal the existence of many non-steady aseismic slip events. Most of the episodic quasi-static slip events are associated with M≥ 6 earthquakes and they are frequently seen in the areas near the Japan trench in particular. Minor afterslip (∼15cm) of the 2005 Miyagi-oki earthquake (M7.2) is also estimated in the area which encompasses the coseismic slip area of the 2005 earthquake.

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© 2007 公益社団法人 日本地震学会
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