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タイトル: 日高衝上断層系前縁部・馬追丘陵西縁を横切る反射法地震探査
その他のタイトル: High-Resolution Seismic Reflection Profile across at the Western Flank of the Umaoi Hills, the Frontal Part of Hidaka Thrust System, Hokkaido
著者: 加藤, 直子
佐藤, 比呂志
松多, 信尚
平川, 一臣
越谷, 信
宮内, 崇裕
戸田, 茂
加藤, 一
蔵下, 英司
越後, 智雄
三縄, 岳大
永井, 悟
荻野, スミ子
鐙, 顕正
川中, 卓
井川, 猛
著者(別言語): Kato, Naoko
Sato, Hiroshi
Matsuta, Nobuhisa
Hirakawa, Kazuomi
Koshiya, Shin
Miyauchi, Takahiro
Toda, Shigeru
Kato, Hajime
Kurashimo, Eiji
Echigo, Tomoo
Minawa, Takehiro
Nagai, Satoru
Ogino, Sumiko
Abumi, Kensho
Kawanaka, Taku |
キーワード: Shallow seismic reflection profiling
active fault
growth strata
Umaoi hills
Hokkaido
発行日: 2002年12月27日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第77冊第2号, 2002.12.27, pp. 111-121
抄録: Due to the convergence between the Eurasian and North American/Okhotsk plates and possibly due to the westward motion of the Kuril fore arc sliver, a N-S trending fold-and-thrust belt was formed in the western part of the Hokkaido axial zone. In the frontal part of this thrust system, the Umaoi hills were formed as a fault-related fold. To reveal the activity of the thrusting in late Cenozoic and the mechanisms forming the Umaoi hills, high-resolution shallow seismic reflection profiling was undertaken across the western part of the Umaoi Hills. The seismic source was a Mini-vibrator truck, and shot and receiver intervals were 10 m. On the western flank of the Umaoi hills, west-dipping flexures are recognized on the geomorphic surfaces of late Quaternary ages. The seismic reflection profile demonstrates growth folding in the western flank of the Umaoi hills. The basal horizon of the growth strata almost corresponds to the top of the Nina Formation dated at 3.5 Ma. Thus the uplift of the Umaoi hills began after the deposition of the Nina Formation and continued in the late Quaternary. Near the summit of the Umaoi hills, a west dipping active fault (Izumizato fault) is cropping out. A seismic reflection profile shows that the Izumisato fault is a bedding-slip fault and the fault is not connected directly with the subsurface master thrust.
URI: http://hdl.handle.net/2261/13246
ISSN: 00408972
出現カテゴリ:東京大学地震研究所彙報
東京大学地震研究所彙報

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