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タイトル: 石油探査データの再解析による庄内平野東縁断層帯の地下形状
その他のタイトル: Subsurface geometry of the eastern Shonai plain active fault system, NE Japan, revealed by reprocessing industry seismic reflection data
著者: 加藤, 直子
佐藤, 比呂志
小澤, 岳史
川中, 卓
著者(別言語): Kato, Naoko
Sato, Hiroshi
Kozawa, Takshi
Kawanaka, Taku
キーワード: active fault
seismic reflection profiling
the eastern Shonai plain fault zone
NE Japan
発行日: 2006年
出版者: 東京大学地震研究所
掲載誌情報: 地震研究所彙報. 第81号第2冊, 2006, pp. 149-156
抄録: The eastern Shonai plain fault zone is a 40-km-long reverse fault zone bounding the western margin of the Dewa hills. Due to the lack of geophysical exploration data, the subsurface geometry of this fault system is poorly understood, especially in the southern part. Industry seismic data acquired in 1311 across the fault zone along the R. Mogami-gawa was reprocessed to reveal the subsurface geometry of the active fault system. The seismic image was improved by applying interactive velocity analysis and post-stacked migration processing. The migrated, depth-converted seismic section portrays the east-dipping faults. The eastern fault coincides with the Matusyama fault estimated by tectonic geomorphological features. The newly found fault is an east-dipping blind thrust located west of the known active fault. Based on growth strata beneath the Shonai plain, another blind fault is estimated.
URI: http://hdl.handle.net/2261/5917
ISSN: 00408972


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