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Analysis of dynamic behavior of interactive fault system and estimate of high frequency strong motion

Research Project

Project/Area Number 06680423
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Natural disaster science
Research InstitutionUniversity of Tokyo

Principal Investigator

YAMASHITA Teruo  Earthquake Research Institute, University of Tokyo, Professor, 地震研究所, 教授 (10114696)

Co-Investigator(Kenkyū-buntansha) UMEDA Yasuhiro  Disaster Prevention Research Institute, Kyoto University, Associate Professor, 防災研究所, 助教授 (10025421)
MIYATAKE Takashi  Earthquake Research Institute, University of Tokyo, Associate Professor, 地震研究所, 助教授 (60126183)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsfault / crack / strong motion / interactions / rupture / 断層帯 / 地震波
Research Abstract

The critical slip displacement D_c is defined as the amount of relative slip required for the shear stress to decrease to the residual stress level. It is indicated that there is a discrepancy between laboratory measurements of D_c and values obtained from modeling earthquakes. Our theoretical analysis has shown that the existence of a thick fault zone for natural earthquake is likely to contribute this discrepancy.
We also theoretically studied the dynamic nucleation of an earthquake in a fault zone in which small preexisting cracks are densely distributed. Dynamic rupture nucleated in such a zone is significantly influenced by the crack interactions. In general, crack interactions cause two conflicting effects : One is to promote crack growth, and the other to decelerate it. These two are due to coplanar and non-coplanar crack interactions, respectively. Hence if non-coplanar interactions are predominant at the initial state, the crack growth rate is very slow at its onset as shown in our simulations. Observation of seismic quiescence before a large earthquake implies that the assumption that non-coplanar crack interactions prevail at initial state will be reasonable.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 山下輝夫: "Apparent critical slip displacement caused by the existence of a fault zone" Geophysical Journal International. 125. 459-472 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 梅田康弘: "Dynamic nucleation and arresting of shallow earthquake faulting" Tectonophysics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Yamashita: "Apparent critical slip displacement caused by the existence of a fault zone" Geophys.J.Int.125. 459-472 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Umeda: "Possible mechanisms of dynamic nucleation and arresting of shallow earthquake faulting" Tectonophysics. (to appear). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 山下輝夫: "Apparent criticial slip displacement caused by the existence of a fault zone" Geophysical Journal International. 125. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 梅田康弘: "Dynamic nuclection arresting mechanism of shallow earthquake faulting" Tectonophysics. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Teruo Yamashita: "Earthquake rupture complexity" Pure and Applied Geophysics. 143. 89-116 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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