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このページ(論文)をリンクする場合は次のURLを使用してください: http://hdl.handle.net/2261/8148

タイトル: 糸魚川-静岡構造線活断層系北部大町地域の浅層反射法地震探査
その他のタイトル: Seismic Reflection Profiling Across the North of the Itoigawa-Shizuoka Tectonic Line in Omachi, Central Japan
著者: 松多, 信尚
池田, 安隆
佐藤, 比呂志
今泉, 俊文
田力, 正好
蔵下, 英司
河村, 知徳
加藤, 直子
戸田, 茂
谷, 美由起
加藤, 一
東郷, 正美
中村, 洋介
越後, 智雄
田中, 淳彦
井川, 猛
著者(別言語): Matsuta, Nobuhisa
Ikeda, Yasutaka
Sato, Hiroshi
Imaizumi, Toshifumi
Tajikara, Masayoshi
Kurashimo, Eiji
Kawamura, Tomonori
Kato, Naoko
Toda, Shigeru
Tani, Miyuki
Kato, Hajime
Togo, Masami
Nakamura, Yousuke
Echigo, Tomoo
Tanaka, Atsuhiko
Ikawa, Takeshi
Omachi seismic profiling group
キーワード: Itoigawa-Shizuoka Tectonic line, seismic reflection profiling, Omine Formation, thrust front migration, Eastern Matsumoto Basin fault
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1冊, 2007, pp.37-44
抄録: The Itoigawa-Shizuoka tectonic line (ISTL) active fault system poses the highest seismic risk, and shows one of the largest slip rates among active faults on Honshu Island. In the Omachi area, the ISTL active fault system comprises the eastern Matsumoto basin (EMB) fault to the west and the Otari-Nakayama fault to the east. To understand the structural relation between these two faults, we conducted a seismic reflection survey across them. The length of the seismic line is 6.4km, and the receiver and shot point intervals are 10m. We used a mini-vibrator as a seismic source with a 180-channel seismic recording system. We can image the structure to less than about 1km in depth. The seismic depth section displays the EMB fault as a boundary between east-dipping reflectors to the east and horizontal reflectors in the Masumoto basin. The EMB fault is interpreted as an east vergent, emergent thrust, and its deeper extension merges with the Otari-Nakayama fault. The Omine Formation, which was laid down on an alluvial fan in the late Pliocene and the early Pleistocene, is distributed between EMB and Otari-Nakayama fault. It is evident that the thrust front migrated from the Otari-Nakaya fault to the EMB fault in Quaternary, and then the Omine Formation located at the foreland basin was uplifted.
URI: http://hdl.handle.net/2261/8148
ISSN: 00408992


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