Strength Profile of the Inner Nankai Accretionary Prism at IODP Site C0002

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  • Manami Kitamura
    Department of Earth and Planetary Systems Science, Graduate School of Science Hiroshima University Higashihiroshima Japan
  • Hiroko Kitajima
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan
  • Hiroki Sone
    Department of Civil and Environmental Engineering, Geological Engineering Program University of Wisconsin–Madison Madison WI USA
  • Yohei Hamada
    Kochi Institute for Core Sample Research Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) Kochi Japan
  • Takehiro Hirose
    Kochi Institute for Core Sample Research Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) Kochi Japan

書誌事項

公開日
2019-10-16
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2019gl083732
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The strength of accretionary prisms is important for understanding their formation and the generation of earthquakes along the underlying plate boundary faults. We establish a continuous depth profile of rock strength and possible ranges of the minimum and maximum horizontal stresses (<jats:italic>S</jats:italic><jats:sub>hmin</jats:sub> and <jats:italic>S</jats:italic><jats:sub>Hmax</jats:sub>) based on indentation tests on cuttings samples at the Integrated Ocean Drilling Program (IODP) Site C0002 in the Nankai accretionary prism. The rock strength (i.e., differential stress) increases with depth from 5.1 and 11.0 MPa at 975 meters below the seafloor (mbsf) to 22.8 and 59.6 MPa at 3005 mbsf in normal and reverse faulting regimes, respectively. The minimum value of <jats:italic>S</jats:italic><jats:sub>hmin</jats:sub> and the maximum value of <jats:italic>S</jats:italic><jats:sub>Hmax</jats:sub> range from 33.2 and 49.4 MPa at 975 mbsf to 57.1 and 139.6 MPa at 3005 mbsf, respectively. Our estimated strength, in combination with Coulomb wedge model, may improve understanding of the evolution of accretionary prisms.</jats:p>

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