We present new, high-resolution seismic reflection data (2000 Inabe River profile) acquired across the forelimb and backlimb of Kuwana anticline to further image its subsurface geometry. A seismic source (mini-vibrator) and 150-channel digital telemetry recording system were used in an off-end configuration with the nearest receiver adjacent to the source to record seismic waves from deeper reflection points. A 15-m source and geophone spacing give a 7.5-m CMP (common midpoint) spacing on the final section. The nominal CMP stacking fold had 75 traces. We also suppressed coherent noise by repeating source points 5-10 times. After data processing including surface-consistent statics, velocity analysis, normal moveout (NMO) correction, residual statics, CMP stack, and migration, the section was finally depth-converted using stacking velocities. Reflectors imaged on the seismic profile illuminate that fluvial terraces folded across the forelimb and backlimb are consistent with the subsurface structure of the fold imaged in a seismic section, providing insights into the kinematic solution of the underlying active wedge thrust.
雑誌名
地震研究所彙報
巻
82
号
1
ページ
75 - 84
発行年
2007
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
051.1
出版者
地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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桑名断層のP波浅層反射法地震探査 : 2000年員弁川測線
IHO82109.pdf
(10.69MB)
