The Aoba Eastern Fault, as a norhtern extension of the Futaba active Fault, Sendai area, northeast Japan, and its relation to the Tsubonuma Fault, Nagamachi-Rifu Fault, and Hisanohama-Iwanuma Monocline

  • OSOZAWA Soichi
    Institute of Geology and Paleontology, Graduate School of Science, Tohoku University

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Other Title
  • 双葉断層の北方延長・活断層としての仙台の青葉東断層と,坪沼断層・長町-利府断層・久の浜-岩沼撓曲について
  • フタバ ダンソウ ノ ホッポウ エンチョウ カツダンソウ ト シテ ノ センダイ ノ アオバ ヒガシダンソウ ト ツボヌマ ダンソウ ナガマチ リ フ ダンソウ ヒサ ノ ハマ イワヌマトウキョク ニ ツイテ

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Abstract

Observation of outcrops of the Sendai and its southern area indicates that the Aoba Eastern Fault, the N-S trending left rateral strike-slip fault, is a northern extension of the Futaba Fault south of the Abukuma River. The Aoba Eastern Fault, the NE-SW trending Tsubonuma and Nagamachi-Rifu Faults (thrusts), and the N-S trending Hisanohama-Iwanuma Monocline affect the terrace deposits and the Medeshima Tuff, and have been activated under Quaternary compressional stress field. The Aoba Eastern Fault disruptes the Nagamachi-Rifu and Tsubonuma Faults, which are not continuous each other.

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