Newly found fault exposures and locations of the surface ruptures at the 1896 Rikuu earthquake, accompanied with artificial modification

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  • 人工改変に伴い新たに見つかった1896年陸羽地震の断層露頭
  • ジンコウ カイヘン ニ トモナイ アラタ ニ ミツカッタ 1896ネン リクウ ジシン ノ ダンソウ ロトウ

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Abstract

<p>　 We described newly found fault exposures of the Shiraiwa and Ota faults and obtained dating materials from exposures including that of Senya fault, on which the surface ruptures appeared at the 1896 Rikuu earthquake. Based on radio-carbon dating and paleoseismic interpretation, we examined the event horizon of 1896 earthquake. We also estimated the exact trace of 1896 surface ruptures of Ota fault, using the comparison between before-and-after large scale topographic maps on artificial modification. Each of two new fault exposures and a previously reported fault exposure demonstrates the fault movement of a single event related to the 1896 earthquake. We confirmed that all faults in the exposures described here were activated at the 1896 earthquake and produced continuous fault scarps. The fault scarp of Shiraiwa fault on the foot of mountains is precisely identified along the boundary between higher farming fields and lower paddy fields depicted in the large scale topographic maps drawn before 2000s’ artificial modification.</p>

Journal

  • Active Fault Research

    Active Fault Research 2018 (49), 23-30, 2018-11-30

    Japanese Society for Active Fault Studies

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