Active Fault Research
Online ISSN : 2186-5337
Print ISSN : 0918-1024
ISSN-L : 0918-1024
High resolution, very shallow seismic reflection profiling across active faults: a case study of the Senya fault, Akita Prefecture, Northeast Japan
Nobuhisa Matsuta, Toshifumi Imaizumi, Thomas Pratt, Robert Williams, Hiroshi Sato, Eiji Kurashimo, Naoko Kato, Sumiko Ogino, Hiroshi Moriya, Shinro Abe
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Keywords: very shallow seismic reflection profiling, active fault, Senya fault, boring, reverse fault
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2001 Volume 2001 Issue 20 Pages 40-45

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Abstract
A high-resolution P-wave seismic reflection profile was acquired across the toe of the Senya thrust, northern Honshu, Japan, to test the applicability of profiling using a hummer source (3.5 kg). Seismic data was recorded by a portable recording system (60 ch), with 28Hz geophones spaced at 0.5m intervals, and processed by standard Common Mid-Point (CMP) method. The obtained seismic section clearly demonstrates an eastdipping thrust down to 40-m in depth. The geometry of the thrust well fit to the subsurface structure estimated by drill core data.
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