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タイトル: 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
その他のタイトル: High-density Seismic Array Observations Across the Northern Focal Area of the 2008 Iwate-Miyagi Nairiku Earthquake
著者: 蔵下, 英司
佐藤, 比呂志
阿部, 進
岩崎, 貴哉
飯高, 隆
加藤, 直子
坂, 守
越谷, 信
野田, 賢
芹澤, 正人
佐藤, 史祥
綿引, 芙美子
茂木, 太郎
花田, 類
川中, 卓
酒井, 慎一
加藤, 愛太郎
金澤, 敏彦
平田, 直
著者(別言語): Kurashimo, Eiji
Sato, Hiroshi
Abe, Susumu
Iwasaki, Takaya
Iidaka, Takashi
Kato, Naoko
Saka, Mamoru
Koshiya, Shin
Noda, Masaru
Serizawa, Masato
Sato, Fumiaki
Watahiki, Fumiko
Mogi, Taro
Hanada, Rui
Kawanaka, Taku
Sakai, Shinichi
Kato, Aitaro
Kanazawa, Toshihiko
Hirata, Naoshi
キーワード: the Iwate-Miyagi Nairiku Earthquake in 2008
active fault system
aftershock observations
発行日: 2012年3月26日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第86号第1/2冊, 2012.3.26, pp. 1-10
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.
URI: http://hdl.handle.net/2261/51524
ISSN: 00408972


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