Comparison of fault gouges in the aftershock area and the non aftershock area of the 2000 Tottori-ken Seibu earthquake

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  • Manaka Mitsuo
    Research Core for Deep Geological Environments, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology
  • Fukushi Keisuke
    Institute of Nature & Environmental Technology, Kanazawa University
  • Miyashita Yukari
    Active Fault and Earthquake Research Center, National Institute of Advanced Industrial Science and Technology
  • Itoh Jun'ichi
    Research Core for Deep Geological Environments, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology
  • Watanabe Yoshio
    Research Core for Deep Geological Environments, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology
  • Kobayashi Kenta
    Graduate School of Science and Technology, Niigata University
  • Kamei Atsushi
    Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University

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Other Title
  • 2000年鳥取県西部地震の余震域と非余震域に分布する断層ガウジの比較
  • 2000ネン トットリケン セイブ ジシン ノ ヨシンイキ ト ヒヨシンイキ ニ ブンプ スル ダンソウ ガウジ ノ ヒカク

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Abstract

We examined and compared mineralogical and geochemical properties of fault gouges in the aftershock and non-aftershock areas of the 2000 Tottori-ken Seibu earthquake, to establish a new method for evaluating the activity of low-activity faults. The gouges were examined using X-ray powder diffraction analysis, sequential selective extraction tests, and color measurements. Results show that the aftershock-area gouge is mainly composed of illite and chlorite, while the non-aftershock-area gouge is mainly composed of halloysite. Iron in the aftershock-area gouge is mainly contained in illite, while in the non-aftershock-area gouge, it is mainly in the form of amorphous and crystalline iron oxide. Results of color measurements (L∗a∗b∗ color space) show that differences in L∗ values represent differences in the presence/absence of illite and halloysite, negative a∗ values from the aftershock-area gouge represent the presence of chlorite, and positive a∗ values from the non-aftershock-area gouge represent the presence of crystalline iron oxide. These results indicate that mineralogical and geochemical characteristics can clearly distinguish fault gouges in aftershock and non-aftershock areas of the 2000 Tottori-ken Seibu earthquake, and that color measurements can be an effective and simple proxy method for the screening of gouges that require further analysis in the field.

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