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2003年十勝沖地震 : 1952年十勝沖地震からの地震活動・前震・本震・余震および誘発地震

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Title: 2003年十勝沖地震 : 1952年十勝沖地震からの地震活動・前震・本震・余震および誘発地震
Other Titles: The 2003 Tokachi-oki Earthquake, off Southeastern Hokkaido, Japan : Seismic Activities from the Former 1952 Tokachi-oki Earthquake, Foreshock, Mainshock, Aftershocks, and Triggered Earthquakes
Authors: 高橋, 浩晃1 Browse this author →KAKEN DB
笠原, 稔2 Browse this author →KAKEN DB
Authors(alt): TAKAHASHI, Hiroaki1
Keywords: The 2003 Tokachi-oki earthquake
recurrent earthquake
aftershock activity
triggered earthquakes
Issue Date: 27-Dec-2004
Publisher: 日本地震学会
Journal Title: 地震. 2輯
Volume: 57
Issue: 2
Start Page: 115
End Page: 130
Publisher DOI: 10.4294/zisin1948.57.2_115
Abstract: The Tokachi-oki earthquake (M_<JMA>8.0) occurred on September 26, 2003 (JST) off southeastern Hokkaido, Japan. We investigate the seismic activity before and after the mainshock using hypocenter catalogues produced by Japan Meteorological Agency and Hokkaido University. A decline of seismic activity and a seismic gap in the asperity of the 2003 earthquake had been clearly recognized from the early 1990's to just the mainshock faulting. Similar low seismicity had been observed before the former 1952 Tokachi-oki earthquake (M_<JMA>8.2). These facts may reflect that the plate boundary fixed loosely has become tight coupling during one seismic cycle. A relatively low seismicity patch during the interseismic phase corresponds to the asperity. This suggests that interseismic seismic activity is strongly controlled by existence of the asperity. The aftershock region of the 2003 earthquake is approximately 160km by 160km, which is slightly smaller than that of the 1952 earthquake. This feature is in good agreement with the slip distributions of the 1952 and 2003 earthquakes estimated from tsumani waveform inversions. Large aftershocks are located out of the asperity, which may reflect the stress status in and around the asperity. Remarkable triggered seismic activity has begun just after the mainshock along the volcanic front in the eastern Hokkaido.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 浩晃

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