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Study on Rupture Initiation by Broadband Records for Local Earthquakes.

Research Project

Project/Area Number 02640310
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionYokohama City University

Principal Investigator

KIKUCHI Masayuki  Yokohama City University Professor, Faculty of Liberal Art and Science, 文理学部, 教授 (20046147)

Co-Investigator(Kenkyū-buntansha) ISHIDA Mizuho  National Research Institute for Earth and Disaster Prevention, Head, Earth Scien, 地圏地球研究部, 研究室長
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsBroadband Record / Inversion / Rupture Process / Stress drop / 応帯域地震記録 / インバ-ジョン / 小田原地震
Research Abstract

Body wave data recorded at a network of broadband seismograph stations were analysed to investigate local events with focal depths deeper than about 50 km. For these events the initial portion of P wave displacement represents well the source time function, but only if the amplitude is normalized to the maximum moment rate. The magnitudes of the analysed earthquakes range from Mw=3.1 to 6.5. It is shown than the seismic moment Mo and the pulse width T are well correlated as Mo/T^3=const., indicating that the stress drop is largely constant. This dynamic similarity seems to be valid for a vast range of earthquake sizes : Mw=1-8. Closer inspection of Mo/T^3 indicates that the stress drop slightly depends on the source depth while it is almost independent of whether the source is an inter-plate event or an intra-plate event. It is also shown that source complexity such as a multiple shock nature is not a characteristic of large earthquakes but is often observed even for small earthquakes.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] KIKUCHI,M.and H.Kanamori: "Inversion of complex body waves-III" Bull.Seismo.Soc.Am.81. 2335-2350 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kikuchi,M.: "Strain drop and apparent strain for lange carthquakes" Tectonophysics. 211. 107-113 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ishida,M.and M.Kikuchi: "A possible fare shock of a future large earthquake near Odawara,central Japan" Geophys.Res.Lett.19. 1695-1698 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Feng,D.,T.Nishikawa M.Kikuchi and M.Watabe: "Broad-band seismograms by hierarchy model" 構造工学論文集. 38. 71-84 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kikuchi, M. and H.Kanamori: "Inversion of complex body waves-III" Bull.Seism.Soc.Am.81. 2335-2350 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kikuchi, M.: "Strain drop and apparent strain for large earth-quakes" Tectonophysics. 211. 107-113 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ishida, M. and Kikuchi, M: "A possible foreshock of a future large earthquake near Odawara, central Japan" Geophys.Res.Lett. 19. 1695-1698 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Feng, D., T.Nishikawa, M.Kikuchi and M.Watabe: "Broad-band Seismograms by Hierarchy Model" Kozokogakuronbunsyu. 38. 71-84 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kikuchi,M.and H.Kanamori: "Inversion of complex body wavesーIII" Bull.Seismo.Soc.Am.81. 2335-2350 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kikuchi,M.: "Strain drop and apparent strain for large earthquakes" Tectonophysics.

    • Related Report
      1991 Annual Research Report
  • [Publications] Ishida,M.and M.Kikuchi: "A possible foreshock of a future large earthquake near Odawara,central Japan" Geophys.Res.Letters.

    • Related Report
      1991 Annual Research Report
  • [Publications] Kikuchi,M.and H.Kanamori: "Inversion of complex body wavesーIII" Bull.Seism.Soc.Am.(1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 菊地 正幸: "震源過程の微細構造" 地震. 特集号. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kikuchi,M.: "Estimation of the effective stress at an introductory stage of rupture process." 1990 Western Pacific Geophysics Meeting. S22A-6 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kikuchi,M.and H.Kanamori: "Reーexamination of the source process of the 1976 Guatemala earth quahe" 1990 Western Pacific Geophysics Meeting. A32A-9 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 石田 瑞穂・菊地 正幸: "神奈川県西部に発生したM5.4の地震の解析" 1990地震学会秋季大会予稿集. 141 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 菊地 正幸・石田 瑞穂: "1990年8月5日小田原地震の初期破壊過程" 1991地球惑星科学関連学会合同大会. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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