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タイトル: 2007年能登半島地震震源域陸域の反射法地震探査
著者: 佐藤, 比呂志
川崎, 慎治
阿部, 進
加藤, 直子
岩崎, 貴哉
伊藤, 谷生
著者(別言語): Sato, Hiroshi
Kawasaki, Shinji
Abe, Susumu
Kato, Naoko
Iwasaki Takaya
Ito, Tanio
キーワード: 2007 Noto Hanto earthquake
earthquake source fault
seismic reflection profiling
geo-logic structure, central Japan
発行日: 2007年
出版者: 地震研究所
掲載誌情報: 地震研究所彙報. 第82号第4冊, 2007, pp. 265-273
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.
URI: http://hdl.handle.net/2261/15596
ISSN: 00408992


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