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Study on estimation of dynamic faulting parameters for strong ground motion simulations

Research Project

Project/Area Number 17510146
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster science
Research InstitutionThe University of Tokyo

Principal Investigator

MIYATAKE Takashi  The University of Tokyo, Earthquake Research Institute, Associate Professor (60126183)

Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsEarthquake Source Process / Strong Ground Motion / 震源物理
Research Abstract

Firstly, we improve the implementation of the fault boundary conditions in the staggered grid finite-difference method by using a fictitious surface to satisfy the fault boundary conditions. In our implementation, velocity (or displacement) grids are set on the fault plane, stress grids are shifted half grid spacing from the fault and stress on the fictitious surface in the rupture zone is given such that the interpolated stress on the fault is equal to the frictional stress. Our implementation has five advantages over previous versions: (1) No leakage of the slip prior to rupture and (2) a zero thickness fault, (3) stress on the fault is reliably calculated, (4) our implementation is suitable for the study of fault constitutive laws, as slip is defined as the difference between displacement on the plane of z=+0 and that of z=-0, and (5) cessation of slip is achieved correctly.
Secondly, we investigated the validity of a method for estimating the critical slip-weakening distance (Dc), w … More hich was proposed by Mikumo and Yagi [2003], for a dynamic rupture model of a recent earthquake. Assuming a uniform distribution of Dc on the fault, we simulated spontaneous dynamic rupture process and generated the synthetic waveforms that would be observed at actual recording stations. Then, we carried out kinematic inversion of the synthetic waveforms and obtained the slip-rate time functions on each subfault. We estimate Dc from these functions and discuss whether the assumed Dc could be recovered correctly. We also investigated the rupture propagation effect over each subfault with a finite dimension and the effects from the waveform inversion and band-pass filtering processes on the estimate of Dc. We found that the propagation effect could cause an apparent correlation between the recovered Dc0-values and the final slip.
It is also important to clarify radiation mechanism of high frequency seismic waves for strong ground motion simulation and for study of physical mechanism of earthquake. Two mechanisms, i.e., stochastic rupture process and stopping phase, had been proposed. When the former mechanism is dominant, high frequency waves must be radiated from inside the asperity. On the other hand, in the case of the latter mechanism, it must be generated from edge of the asperity. In waveform analyses of four inland earthquakes, Japan, Miyake, et. al. (2003) found that the size and position of high frequency rich strong motion generation area coincide with those of asperities. Considering the resolution of the analyses, however, it is not possible to distinguish which mechanism is dominant. The generation area might be along the edge of the asperity or might be inside the asperity. We discussed the mechanism by using computer simulation, especially, which mechanism is efficient. Since seismic wave has usually high frequency components, effective mechanism is more plausible than ineffective one. Less

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (19 results)

All 2007 2006 2005

All Journal Article (5 results) (of which Peer Reviewed: 2 results) Presentation (14 results)

  • [Journal Article] An improvement of the fault boundary condition in a staggered grid FDM2006

    • Author(s)
      Takashi Miyatake, and Takeshi Kimura
    • Journal Title

      PAGEOPH 163

      Pages: 1977-1990

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] An improvement of the fault boundary condition in a staggered grid FDM2006

    • Author(s)
      Takashi Miyatake, Takeshi Kimura
    • Journal Title

      Pure and Applied Geophysics 163

      Pages: 1977-190

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A comparison between Dc'-values obtained from a dynamic rupture model and waveform inversion2005

    • Author(s)
      Takumi Yasuda, Yuji Yagi, Takeshi Mikumo, and Takashi Miyatake
    • Journal Title

      Geophysical Research Letters 32

    • NAID

      120005537638

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A comparison between Dc'-values obtained from a dynamic rupture model and waveform inversion, doi : 10.1029/2005GL0231142005

    • Author(s)
      Takumi Yasuda, Yuji Yagi, Takeshi Mikumo, and Takashi Miyatake
    • Journal Title

      Geophysical Research Letters doi : 10.1029/2005GL023114 VOL. 32

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A comparison between Dc'-values obtained from a dynamic rupture model and waveform inversion2005

    • Author(s)
      T.Yasuda, Y.Yagi, T.Mikumo, T.Miyatake
    • Journal Title

      Geophysical Research Letters VOL.32,L14316

    • NAID

      120005537638

    • Related Report
      2005 Annual Research Report
  • [Presentation] 数値シミュレーションによる短周期地震波の成因の考察:すべりの不均質性の影響2007

    • Author(s)
      隅谷謙一・宮武隆・木村武志・三宅弘恵
    • Organizer
      日本地震学会秋季大会
    • Place of Presentation
      仙台
    • Year and Date
      2007-10-24
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] 震源断層面上の地殻構造不均質が震源過程に及ぼす影響2007

    • Author(s)
      加藤愛太郎・宮武隆・平田直
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      幕張
    • Year and Date
      2007-05-23
    • Related Report
      2007 Annual Research Report
  • [Presentation] The Effect of Negative Stress Drop on Fault Rupture2006

    • Author(s)
      Miyatake, T., Kimura, and T. Yasuda
    • Organizer
      American Geophysical Union
    • Place of Presentation
      米国・サンフランシスコ
    • Year and Date
      2006-12-14
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] The Effect of Negative Stress Drop on Fault Rupture2006

    • Author(s)
      Miyatake, T., Kimura, and T. Yasuda
    • Organizer
      Fall meeting of American Geophysical Union
    • Place of Presentation
      San Fransisco, U. S. A.
    • Year and Date
      2006-12-14
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A Comparison Between Dc'-values Obtained From a Dynamic Rupture Model and Waveform Inversion2006

    • Author(s)
      Yasuda, T., Yagi, Y., Mikumo, T., and Miyatake.
    • Organizer
      American Geophysical Union
    • Place of Presentation
      米国・サンフランシスコ
    • Year and Date
      2006-12-08
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A Comparison Between Dc'-values Obtained From a Dynamic Rupture Model and Waveform Inversion2006

    • Author(s)
      Yasuda, T., Yagi, Y., Mikumo, T., and Miyatake.
    • Organizer
      Fall meeting of American Geophysical Union
    • Place of Presentation
      San Fransisco, U. S. A.
    • Year and Date
      2006-12-08
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 短周期地震波成因の理解のために-数値シミュレーションによる考察-2006

    • Author(s)
      宮武隆・三宅弘恵
    • Organizer
      日本地震学会秋季大会
    • Place of Presentation
      名古屋
    • Year and Date
      2006-11-02
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Generation mechanism of short period seismic waves using numerical simulation2006

    • Author(s)
      Takashi MIYATAKE and Hiroe MIYAKE
    • Organizer
      Fall meeting of Seismological Society of Janan
    • Place of Presentation
      Nagoya
    • Year and Date
      2006-11-02
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 差分法による動力学モデルを用いた破壊エネルギー分布推定の問題点2006

    • Author(s)
      宮武 隆・安田 拓美
    • Organizer
      日本地球惑星科学連合大会
    • Place of Presentation
      幕張
    • Year and Date
      2006-05-15
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Dynamic rupture process of the 2004 Mid Niigata prefecture earthquake2005

    • Author(s)
      Miyatake, T., Kimura, and T. Yasuda
    • Organizer
      American Geophysical Union
    • Place of Presentation
      米国・サンフランシスコ
    • Year and Date
      2005-12-08
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] The effect of negative stress drop on fault rupture2005

    • Author(s)
      Miyatake, T., T. Kimura, and T. Yasuda
    • Organizer
      2nd International Workshop: Strong ground motion prediction and earthquake tectonics in urban areas
    • Place of Presentation
      東京
    • Year and Date
      2005-10-26
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] The effect of negative stress drop on fault rupture2005

    • Author(s)
      Miyatake, T., T. Kimura, and T. Yasuda
    • Organizer
      2nd International Workshop : Strong ground motion prediction and earthquake tectonics in urban areas
    • Place of Presentation
      Tokyo
    • Year and Date
      2005-10-26
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 負の応力降下域と破壊過程への影響2005

    • Author(s)
      宮武 隆・木村 武志・安田 拓美
    • Organizer
      日本地震学会
    • Place of Presentation
      札幌
    • Year and Date
      2005-10-20
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 強震動シミュレーションのための滑り速度時間関数近似式:新潟県中越地震への応用-その22005

    • Author(s)
      宮武 隆・木村 武志・安田 拓美
    • Organizer
      日本地震学会
    • Place of Presentation
      札幌
    • Year and Date
      2005-10-20
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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