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Synthetic Seismicity Model for the Xianshuihe Fault, Southwestern China

Research Project

Project/Area Number 14340128
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

KATO Naoyuki  The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (60224523)

Co-Investigator(Kenkyū-buntansha) KATO Teruyuki  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (80134633)
LEI Xinglin  National Industrial Science and Technology, Senior Researcher, 地球科学情報研究部門, 主任研究員 (70358357)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsXianshuihe fault / GPS / slip rate / friction / rock mechanics / simulation / seismicity
Research Abstract

(1)Tectonic Model. We investigated deformation pattern of China using GPS data. Assuming that China consists of several rigid blocks, we determined displacement rates, slip deficit on faults, and internal deformation of the blocks. The results show that the displacement rate of the Sichuan-Yunnan block, which is caused by the collision of India, is 7.0 to 9.5 mm/yr, consistent with the geologically estimated value of 9 mm/yr. The slip deficit along the Xianshuihe fault is significantly smaller than the relative displacement rate between the two rigid blocks, indicating that the fault is virtually locked. (2)Laboratory Experiment. We measured acoustic emission (AE) during brittle deformation process of rock samples with preexisting joints under tri-axial compression. For rock samples without joints, the hypocenters of AEs are scattered and the fractal dimension of the hypocenter distribution is low when the applied compressional stress is low. On the other, in the case of rock samples w … More ith joints, AEs are concentrated along the joints under low compressional stress. AE clusters are generated near joint bends. (3)Numerical Simulation of Seismicity along the Xianshuihe Fault. We develop a synthetic seismicity model, assuming that the frictional stress of the fault follows a laboratory-derived rate and state-dependent friction law and using the long-term average slip rate along the fault estimated from geologically and geodetic observations. By selecting appropriate model parameters, we can simulate recurrence of active periods of fault motion with a recurrence interval of a few hundred years, being consistent with historically recorded seismicity. Rupture is arrested at regions of fault bend or branch or regions with velocity-strengthening frictional property. The arrested rupture is often reactivated after several years. This is because aseismic sliding propagates slowly in the velocity-strengthening regions. This explains migration of seismic activity along the fault. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (19 results)

All 2005 2004 Other

All Journal Article (13 results) Publications (6 results)

  • [Journal Article] Tectonics in eastern Asia as seen from GPS observations2005

    • Author(s)
      Iwakuni, M., T.Kato
    • Journal Title

      Proceedings of the International Workshop on Geodynamics : Observation, Modeling, and Computer Simulation (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Modeling damage creation in stressed brittle rocks by means of acoustic emission2005

    • Author(s)
      Lei, X.L., T.Satoh, O.Nishizawa, K.Kusunose, M.V.M.S.Rao
    • Journal Title

      Proceedings of RaSim6 (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Modeling damage creation in stressed brittle rocks by means of acoustic emission2005

    • Author(s)
      Lei, X.L., T.Satoh, O.Nishizawa, K.Kusunose, M.V.M.S.Rao.
    • Journal Title

      Proceedings of RaSim6 (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Interaction of slip on asperities : Numerical simulation of seismic cycles on a two-dimensional planar fault with nonuniform frictional property2004

    • Author(s)
      Kato, N.
    • Journal Title

      J.Geophys.Res. 109(B12)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] A possible effect of an intermediate depth intraslab earthquake on seismic cycles of interplate earthquakes at a subduction zone2004

    • Author(s)
      Kato, N.
    • Journal Title

      Earth Planet.Space 56(6)

      Pages: 553-561

    • NAID

      10017464574

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Crustal deformation in Thailand and tectonics of Indochina peninsula as seen from GPS observations2004

    • Author(s)
      Iwakuni, M., T.Kato, H.Takiguchi.T.Nakaegawa, M.Satomura
    • Journal Title

      Geophys.Res.Lett. 31

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Three typical stages of acoustic emission activity during the catastrophic fracture of heterogeneous faults in jointed rocks2004

    • Author(s)
      Lei, X.L., K.Masuda, O.Nishizawa, L.Jouniaux, L.Liu, W.Ma, T.Satoh, K.Kusunose
    • Journal Title

      J.Struct.Geol. 26

      Pages: 247-258

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Interaction of slip on asperities : Numerical simulation of seismic cycles on a two-dimensional planar fault with nonuniform frictional property2004

    • Author(s)
      Kato, N.
    • Journal Title

      J.Geophys.Res 109 (B12)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A possible effect of an intermediate depth intraslab earthquake on seismic cycles of interplate earthquakes at a subduction zone2004

    • Author(s)
      Kato, N.
    • Journal Title

      Earth, Planet.Space 56(6)

      Pages: 553-561

    • NAID

      10017464574

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Crustal deformation in Thailand and tectonics of Indochina peninsula as seen from GPS observations2004

    • Author(s)
      Iwakuni, M., T.Kato, H.Takiguchi, T.Nakaegawa, M.Satomura
    • Journal Title

      Geophys.Res.Lett. 31

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Three typical stages of acoustic emission activity during the catastrophic fracture of heterogeneous faults in jointed rocks2004

    • Author(s)
      Lei, X.L., K.Masuda, O.Nishizawa, L.Jounlaux, L.Liu, W.Ma, T.Satoh, K.Kusunose
    • Journal Title

      J.Struct.Geol. 26

      Pages: 247-258

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Tectonics in eastern Asia as seen from GPS observations

    • Author(s)
      Iwakuni, M., T.Kato
    • Journal Title

      Proceedings of the International Workshop on Geodynamics : Observation, Modeling, and Computer Simulation (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Modeling damage creation in stressed brittle rocks by means of acoustic emission

    • Author(s)
      Lei, X.L., T.Satoh, O.Nishizawa, K.Kusunose, M.V.M.S.Rao
    • Journal Title

      Proceedings of RaSim6 (in press)

    • Related Report
      2004 Annual Research Report
  • [Publications] Kato, N.: "A possible model for large preseismic slip on a deeper extension of a seismic rupture plane"Earth Plane.Sci.Lett.. 216・1. 17-25 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kato, N., T.E.Tullis: "Numerical simulation of seismic cycles with a composite rate- and state-dependent friction law"Bull.Seismol.Soc.Am.. 93・2. 841-853 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kato, N.: "Repeating slip events at a circular asperity : Numerical simulation with a rate- and state-dependent friction law"Bull.Earthq.Res.Inst.Univ.Tokyo. 78・2. 151-166 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 加藤尚之: "プレート境界面の摩擦パラメターの推定について-三陸沖のアスペリティを例として-"地学雑誌. 112・6. 857-868 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kato, N.: "Seismic cycle on a strike-slip fault with rate-and state-dependent strength in an elastic layer overlying a viscoelastic half-space"Earth Planets and Space. 54・12. 1077-1083 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kato, N., T.E.Tullis: "Numerical simulation of seismic cycles with a composite rate-and state-dependent friction law"Bull.Seismol.Soc.Am.. 93・2(印刷中). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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