科学掘削による地震断層の応力状態・物性・すべりパラメーターの評価  [in Japanese] Evaluating Stress State, Physical Properties, and Rupturing Behavior of Seismogenic Faults through Scientific Drillings  [in Japanese]

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Author(s)

    • 林 為人 LIN Weiren
    • 京都大学大学院工学研究科|海洋研究開発機構高知コア研究所 Graduate School of Engineering, Kyoto University|Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
    • 廣瀬 丈洋 HIROSE Takehiro
    • 海洋研究開発機構高知コア研究所 Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
    • 谷川 亘 TANIKAWA Wataru
    • 海洋研究開発機構高知コア研究所 Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
    • 濱田 洋平 HAMADA Yohei
    • 海洋研究開発機構高知コア研究所 Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology

Abstract

特集号:沈み込む海洋プレート科学の最前線 --アウターライズ海洋掘削に向けて--

<p> To better understand seismic fault rupturing mechanisms, recent research results from scientific ocean drilling projects in seismogenic subduction zones such as Japan Trench and Nankai Trough carried out under the International Ocean Discovery Program (IODP) are reviewed and summarized. Stress states in the vicinity of faults and in wall rocks penetrated by drillings are determined or constrained using borehole wall resistivity images and drill core samples. The stress measurement methods are summarized and the stress results are interpreted. Fluid transportation properties and thermal properties within and around the faults are determined from retrieved core samples. The results are both useful and necessary for examining fault rupturing lubrication mechanisms, e.g., coseismic thermal pressurization. Dynamic frictional behavior of fault gouges is elucidated through rotary frictional experiments over a wide range from intermediate to high velocities covering the real coseismic fault slip velocity at around 1 m/s; the results indicate that frictional coefficients of plate boundary fault gouges in subduction zones are very low. In addition, high-temperature history examined with vitrinite reflectance measurements and minor element movements from isotopic analyses using the fault core samples give important evidence of the frictional heat of faults. Such historic high-temperature signals also enable inversion estimations to reveal past fault-rupturing parameters. It is hoped this review paper will be valuable and helpful for planning and implementing future scientific fault drilling programs.</p>

Journal

  • Journal of Geography (Chigaku Zasshi)

    Journal of Geography (Chigaku Zasshi) 126(2), 223-246, 2017

    Tokyo Geographical Society

Codes

  • NII Article ID (NAID)
    130005696814
  • NII NACSIS-CAT ID (NCID)
    AN00322536
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    0022-135X
  • NDL Article ID
    028200896
  • NDL Call No.
    Z15-169
  • Data Source
    NDL  IR  J-STAGE 
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