腎腓腢腛腜腍腚腗腘ῌ腟腏腚腗腊腎腚腄腉腖腗腠腑腡腛腕 腙腐 腁,**/ 腞腂 : 腌腀腋腒腝腇腔腣腈腅腃腆 臂腭腤膀 +腃 *ῌ腷膙膈膲 ,腃 ῌ腓腰膦膺 -腃 ῌ腢膮膒膹 .腃 ῌ腓膢 膋 /腃 ῌ膸膪 腬 /腃 ῌ腗膬 腑 0腃 ῌ腯膪 膵 1腃 ῌ膕腼膡膷 2腃 ῌ腸膬膰膿膂 3腃 ῌ腔膪膍腙 +*腃 ῌ膎膪膝腾 ++腃 ῌ膎膢膨腕 ++腃 ῌ膌腖膋膐 ,腃 ῌ腵腧膆 腑 ,腃 ῌ腧膌腱膾 ,腃 ῌ膓膑膝膀 +,腃 ῌ腼腻腳膞 +-腃 ῌ膊膧膞臀 +.腃 ῌ腎膘 膶 +.腃 +腃 膫膴膠腚膠腚腒膽腚腫腣腘ῌ ,腃 膫膴膠腚膠腚腒膽腚腫腣腘ῌ -腃 膫腤膠腚膠腚腒膽腚腪腫腣腘 腂腮腹: 腂腺腃 膥腏 膥膯 腞腥 腫腣膉腃ῌ .腃 膗膻膠腚膠腚腒膄膚腘腚腫腣腘ῌ /腃 腠膅膠腚腲腚膱ῌ 0腃 腼膼膠腚腦腐膐腟 腘腚膱ῌ 1腃 腍膤腦腐膠腚腦腐腚膱ῌ 2腃 腂膭腃腽腨腡膇膜腶腫腣膉腛膣膛腫腣腊腌腋腀ῌ 3腃 膫腤膠腚膥膏腫腣 膉ῌ +*腃 膫腤膠腚膠腚腒膽腚腪腫腣腘ῌ ++腃 腠膅膠腚膠腚腒腲腚腫腣腘ῌ +,腃 膫膴膠腚膽腚膱ῌ +-腃 腍膤腦腐膠 腚腦腐腚膱 腂腮腹: 膩膪腲腨腂腜腃腃ῌ +.腃 腂腜腃腈腆腇腉 High-resolution seismic reflection profiling across the Shiraiwa fault, eastern margin of the Yokote basin fault zone, northeast Japan : data acquisition and processing Kyoko Kagohara +)* , Toshifumi Imaizumi ,腃 , Tomoo Echigo -腃 , Takahiro Miyauchi .腃 , Shin Koshiya /腃 , Masaru Noda /腃 , Hajime Kato 0腃 , Shigeru Toda 1腃 , Tatsuya Ishiyama 2腃 , Hiroshi Sato 3腃 , Shinsuke Okada +*腃 , Satoshi Kanda ++腃 , Naoto Kamiya ++腃 , Nobuto Morishita ,腃 , Shuichi Takahashi ,腃 , Kosuke Hashimori ,腃 , Satoko Shimizu +,腃 , Kota Yamazaki +-腃 , Taro Koike +.腃 and Takeshi Ikawa +.腃 +腃 Graduate School of Science, Tohoku University, ,腃 Graduate School of Science, Tohoku University, -腃 Graduate School of Science, the University of Tokyo (Now at Geo-Research Institute), .腃 Graduate School of Science and Technology, Chiba University, /腃 Faculty of Engineering, Iwate University, 0腃 Faculty of Education and Human Sciences, Yamanashi University, 1腃 Faculty of Education, Aichi University of Education, 2腃 Active Fault Research Center, National Institute of Advanced Industrial Science and Technology, 3腃 Earthquake Research Institute, the University of Tokyo, +*腃 Graduate School of Science, the University of Tokyo, ++腃 Graduate School of Engineering, Iwate University, +,腃 Faculty of Science, Tohoku University, +-腃 Faculty of Education, Aichi University of Education (Now at TSUDA INDUSTRIES CO., LTD.), +.腃 Geosys Inc. Abstract The eastern margin of the Yokote basin fault zone extends about /0 km at the western foot of the Ou Backbone Range, northeast Japan. The Rikuu earthquake (M腄1.,) occurred in the Ou Backbone Range (Mahiru Range) on -+st August, +230. Associated with this earthquake, four thrust faults-Obonai, Shiraiwa, Ota, and Senya fault- appeared on the surface of the western foot of the Mahiru Range. These faults were highly sinuous with numerous gaps and en echelon steps. We conducted a high-resolution seismic reflection profiling survey across the Shiraiwa fault. The obtained seismic reflection data were processed by conventional common mid-point methods, post-stack migration, and depth conversion. The subsurface structure across the Shraiwa fault is characterized by branched low-angle reverse faults and conjugate back-thrust. The emergent thrust associated with the +230 earthquake is regarded to be a subsidiary reverse fault. 膥 膏 腫 腣 膉 臁 膳 Bull. Earthq. Res. Inst. Univ. Tokyo Vol. 2+ 腂,**0腃 pp. +,3ῌ+-2 * e-mail : d*-*[email protected]腂腅32*ῌ2/12 膖膟膁膔膻腩腴腝膃膔膻 0ῌ-腃 腁 129 腁
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Takahashi,�, Kosuke Hashimori,�, Satoko Shimizu+,�, Kota Yamazaki+-�, Taro Koike+.� and
Takeshi Ikawa+.�
+�Graduate School of Science, Tohoku University, ,�Graduate School of Science, Tohoku University,-�Graduate School of Science, the University of Tokyo (Now at Geo-Research Institute), .�Graduate
School of Science and Technology, Chiba University, /�Faculty of Engineering, Iwate University,0�Faculty of Education and Human Sciences, Yamanashi University, 1�Faculty of Education, Aichi
University of Education, 2�Active Fault Research Center, National Institute of Advanced Industrial
Science and Technology, 3�Earthquake Research Institute, the University of Tokyo, +*�Graduate
School of Science, the University of Tokyo, ++�Graduate School of Engineering, Iwate University,+,�Faculty of Science, Tohoku University, +-�Faculty of Education, Aichi University of Education
(Now at TSUDA INDUSTRIES CO., LTD.), +.�Geosys Inc.
Abstract
The eastern margin of the Yokote basin fault zone extends about /0 km at the western foot of
the Ou Backbone Range, northeast Japan. The Rikuu earthquake (Mv1.,) occurred in the Ou
Backbone Range (Mahiru Range) on -+st August, +230. Associated with this earthquake, four thrust
faults-Obonai, Shiraiwa, Ota, and Senya fault- appeared on the surface of the western foot of the
Mahiru Range. These faults were highly sinuous with numerous gaps and en echelon steps.
We conducted a high-resolution seismic reflection profiling survey across the Shiraiwa fault.
The obtained seismic reflection data were processed by conventional common mid-point methods,
post-stack migration, and depth conversion. The subsurface structure across the Shraiwa fault is
characterized by branched low-angle reverse faults and conjugate back-thrust. The emergent
thrust associated with the +230 earthquake is regarded to be a subsidiary reverse fault.