C-14 ages of the low terrace (L1) deposits and surface ruptures associated with the 2008 Iwate-Miyagi Nairiku earthquake along the Mauchi River at Mochikorobashi, Ohshu City, Iwate Prefecture, northern Honshu, Japan

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  • 岩手県奥州市衣川区餅転付近における 低位段丘のC-14年代値と2008年岩手・宮城内陸地震の地震断層
  • イワテケン オウシュウシ コロモガワクモチコロバシフキン ニ オケル テイイ ダンキュウ ノ C 14ネンダイチ ト 2008ネン イワテ ミヤギ ナイリク ジシン ノ ジシン ダンソウ

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Abstract

We obtained C-14 ages of about 20,000 yBP from wood fragments collected within lower terrace (L1) deposits, along the Mauchi River at Mochikorobashi, Ohshu City, northern Honshu. The L1 surface at the eastern part of Mochikorobashi may indicate flexural deformation trending north-south with relative scarp height of about 13 meters. Less than 0.5 m high surface ruptures associated with the 2008 Iwate-Miyagi Nairiku earthquake (Mj:7.2, Mw:6.8) had appeared just along middle portion of this flexural slope. The average slip rate of vertical component across the Mochikorobashi flexure is estimated to be 0.65mm / yr in maximum.

Journal

  • Active Fault Research

    Active Fault Research 2010 (32), 1-7, 2010

    Japanese Society for Active Fault Studies

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