2024-03-29T06:24:34Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00032485
2022-12-19T05:16:53Z
80:4535:4587:4595
9:504:4538:4589:4596
Seismic Reflection Profiling Across the Northern Part of the Itoigawa-Shizuoka Tectonic Line Active Fault System, Matsumoto, Central Japan
糸魚川-静岡構造線活断層系北部・松本地域における反射法地震探査
松多, 信尚
124438
池田, 安隆
124439
東郷, 正美
124440
今泉, 俊文
124441
佐藤, 比呂志
124442
戸田, 茂
124443
田力, 正好
124444
加藤, 一
124445
石山, 達也
124446
井川, 猛
124447
松本反射法地震探査グループ
124448
51.1
Itoigawa-Shizuoka tectonic line
active fault system
seismic reflection survey
Gofukuji fault
slip partitioning
application/pdf
The Itoigawa-Shizuoka tectonic line (ISTL) active fault system shows complicated fault traces in the Matsumoto area, at the southern end of the northern part of the ISTL active fault system. In this area, there are two tectonic deformation zones; the clear sinistral fault (Gofukuji fault) and the anticline and reverse fault (Akagiyama fault). To clarify the relation between the two deformation zones, we conducted two high-resolution shallow seismic reflection surveys across Gofukuji and Akagiyama faults. The lengths of the seismic line are 1.6 and 1.9km, respectively, and the receiver interval was 10m and the shot point interval was 10m (Gofukuji seismic line) or 5m (Akagiyama seismic line). In the Gofukuji seismic line, we estimated the east-dipping Gofukuji frontal thrust and possible high-angle Gofukuji fault. The Akagiyama seismic profile demonstrates an asymmetric anticline with a steeper eastern limb associated with the west-dipping Akagiyama fault. Based on the tectonic geomorphological features and subsurface structure, it is considered that the two deformation zones were formed by a single main east-dipping fault with reverse and strike-slip displacements. Through slip partitioning, the high-angle Gofukuji fault shows sinstral displacements, and Gofukuji frontal thrust and Akagiyama fault accommodate shortening deformation.
departmental bulletin paper
地震研究所
2007
application/pdf
地震研究所彙報
1
82
45
55
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/32485/files/IHO82106.pdf
jpn