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

概要

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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.
2007-03-14