東京大学地震研究所
(株)地球科学総合研究所
岩手大学工学部
Earthquake Research Institute, the University of Tokyo
JGI, Inc.
Faculty of Engineering, Iwate University
抄録
On June 14, 2008, the 2008 Iwate-Miyagi Nairiku Earthquake (M JMA 7.2) occurred in the central part of northern Honshu, Japan. The northern part of the focal area is near the Dedana fault, which is south of the western marginal faults of the Kitakami lowlands. Seismic reflection/refraction experiments were conducted across the Dedana fault in 2006 and 2007. Deeper extensions of the west-dipping listric faults were well demonstrated on the seismic reflection section. Revealing the relationship between an active fault system and aftershock distribution is important to constrain the process of earthquake occurrence. We conducted high-density seismic array observations across the northern focal area to investigate the relationships between aftershock distribution and crustal structure. We obtained high signal-to-noise ratio data. Prominent late arrivals, probably reflected waves from the deeper part of the crust, can be recognized on the record sections. The aftershock observations are summarized in this paper, and a detailed analysis showing the precise aftershock distribution and seismic velocity structure in and around the northern focal area of the 2008 Iwate Miyagi Nairiku earthquake will be published in a separate paper.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
86
号
1-2
ページ
1 - 10
発行年
2012-03-26
ISSN
00408972
書誌レコードID
AN00162258
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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2008年岩手・宮城内陸地震震源域北部における稠密余震観測
IHO86101.pdf
(2.16MB)
