In August, 2000, an intensive wide-angle seismic experiment was carried out across a foreland area of the Hidaka Collision Zone, Hokkaido, Japan. The 114-km EW profile line of this experiment almost coincides with the eastern half of a 227-km profile undertaken in 1999 from the NE Japan arc to the Kuril forearc across the Hidaka Collision Zone. The aim of the 2000 experiment was to elucidate the deep crustal structure in the fold-and-thrust belt formed by the collision of the NE Japan arc and the Kuril forearc. A total of 327 stations on the profile line recorded four explosive shots with 100-300 kg charges. The complicated seismograms obtained strongly indicate the occurrence of velocity reversal at depths. This experiment also provided important data to constrain the crustal structure west of the Ishikari-Tomakomai Lowland, which was not resolved from the 1999 experiment.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
77
号
2
ページ
173 - 198
発行年
2002-12-27
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
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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北海道日高衝突帯前縁部における屈折・広角反射地震探査 : 大滝-平取測線
ji0772007.pdf
(2.04MB)
