Japan Geoscience Union Meeting 2015

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Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS28] Active faults and paleoseismology

Wed. May 27, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Takashi AZUMA(National Institute of Advanced Industrial Science and Technology), Nobuhiko Sugito(Faculty of Humanity and Environment, Hosei University), Satoshi Tonai(Department of Applied Science, Faculty of Scienece, Kochi University), Toshikazu Yoshioka(Active Fault and Earthquake Research Center, National Institute of Advanced Industrial Science and Technology)

6:15 PM - 7:30 PM

[SSS28-P03] Fault exposure in the Yokote basin accompanied with the 1896 Rikuu earthquake Akita prefecture, Northeast Japan

*Kohei ABE1, Hideki KUROSAWA1, Hideki KOSAKA2, Kyoko KAGOHARA3, Atsushi MIWA1, Toshifumi IMAIZUMI4, Takahiro MIYAUCHI5 (1.Oyo Corporation, 2.Kankyo Chishitsu Co., Ltd, 3.Yamaguchi University, 4.Tohoku University, 5.Chiba University)

Keywords:Rikuu earthquake, surface trace, fault scarp, fault outcrop

Surface ruptures occurred with the 1896 Rikuu earthquake in the northern part of the eastern margin of the Yokote Basin fault zone in Akita Prefecture (the Shiraiwa, Ota, and Senya faults). However, the accurate traces of surface ruptures were not settled especially around the Takayashiki area, Shiraiwa fault.
In this study, we found a new outcrop of the Shiraiwa fault which moved associated with the Rikuu Earthquake and revealed that the surface traces of 1896 faulting was convexly curved to the upstream ward in the valley floor.