東京大学地震研究所
（株）地球科学総合研究所
千葉大学大学院理学研究科
Earthquake Research Institute, the University of Tokyo
JGI Inc.
Graduate School of Science, Chiba University
抄録
The seismogenic source fault of the 2007 Noto Hanto earthquake (M 6.9JMA) runs beneath the northwestern part of the Noto peninsula and its offshore trending ENE-WSW. To reveal the rela-tionship between a seismogenic source fault and geologic structure, shallow, high-resolution seismic reflection and refraction profiling was undertaken across the source fault along the western coast of the Noto peninsula for 10km distance. The seismic source was a vibroseis and seismic data were recorded by fixed 575 channels. The P-wave refraction analysis delineated the three layered velocity structure down to 1km; 2.8km/s, 3.2km/s and 4.1km/s layers. The 3.2km/s layer, which corresponds to the lower Miocene fluvial sediments, shows northward thickening with steps. On the resultant depth converted seismic section, south and north-dipping, faults are interpreted based on the systematic change on dip-angle of the reflectors in the lower Miocene fluvial sediments. By comparing with the aftershock distribution, the deeper extension of the south-dipping fault corresponds to the source fault of the 2007 Noto Hanto earthquake.
雑誌名
地震研究所彙報
巻
82
号
4
ページ
265 - 273
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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2007年能登半島地震震源域陸域の反射法地震探査
IHO82404.pdf
(1.48MB)
