The Hidaka region, central Hokkaido, Japan is characterized as an arc-arc collision zone between the Kuril forearc and the Northeast Japan arc. In 1999, an intensive seismic refraction/ wide-angle reflection experiment was carried out across the Hidaka region to investigate crustal deformation associated with the collision process. We deployed 297 stations on an EW profile line of 227-km to record 6 dynamite shots of 100～700kg charges. Remarkable travel time jumps observed in the western part of the profile indicate a velocity reversal beneath the foreland area of the collision zone. In the eastern part of the profile, travel time curves obtained show a severe undulation. Very clear later phases observed in this part strongly indicate the existence of mid-crustal reflectors within the colliding Kuril forearc.
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
139 - 172
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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北海道日高衝突帯横断屈折・広角反射法地震探査 : 大滝-浦幌測線
ji0772006.pdf
(2.62MB)
