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Crustal deformations caused by seismic and volcanic sources in a spherical earth

Research Project

Project/Area Number 13640420
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

WENKE Sun  The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (10323651)

Co-Investigator(Kenkyū-buntansha) FURUTA Masato  The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助手 (60313045)
OKUBO Shuhei  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (30152078)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsDislocation / Spherical earth / Seismic fault / Volcano / Crustal deformation / Displacement / Gravity / Geoid
Research Abstract

Mainly theoretical research was performed : 1.The effects of the Earth's curvature and radial heterogeneity in dislocation studies were studied, though comparing the coseismic deformations caused by dislocations in half space and homogeneous spherical earth models, a homogeneous sphere and a layer spherical model. It was learnt that both the effects are large. 2.To overcome the disadvantages of the current dislocation theories, a new theory for calculating asymptotic deformations excited by a point dislocation in a spherical symmetric earth model was presented. This theory is given by a closed form of mathematical expressions, so that it is mathematically simple and can be applied easily. Moreover, since the asymptotic theory includes sphericity and vertical structure effects, it is physically more reasonable than the flat-earth theory. 3.The crustal deformation caused by the 2000 Miyakejima volcanic and seismic activities was studied. 4.The co-seismic deformation in spectrum was also considered, so that the ability of satellite gravity missions to detect co-seismic geoid and gravity changes were observed and determined. 6.The expressions of co-seismic strains were derived. The results were presented in different national/international conferences, and published in 8 papers.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Sun, W., S.Okubo: "Effects of the Earth's curvature and radial heterogeneity in dislocation studies-For a point dislocation"Geophys.Res.Lett.. 29. 46-1-46-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Okubo, S., W.Sun, et al.: "Far-Field Deformation due to Volcanic Activity and Earthquakes Swarm"Vistas for Geodesy in the New Millennium. 125. 518-522 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W., S.Okubo: "Co-seismic Geoid and Gravity Changes Detectable by Satellite Gravity Missions"Proceedings of Study of Geodynamics by Satellite Gravity Missions. (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Asymptotic Theory for Calculating Deformations Caused by Dislocations Buried in a Spherical Earth-Geoid Change"Journal of Geodesy. 77. 381-387 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W., S.Okubo: "Co-seismic Deformations Detectable by Satellite Gravity Missions-a Case Study of Alaska(1964,2002)and Hokkaido(2003)Earthquakes in the Spectral Domain"J.Geophys.Res.. (in printing)(印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Asymptotic Solution of Static Displacements Caused by Dislocations in a Spherically Symmetric Earth"J.Geophys.Res.. (in printing)(印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Asymptotic Theory for Calculating Deformations Caused by Dislocations Buried in a Spherical Earth-Gravity Change"Journal of Geodesy. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Discretization Schemes in Downward Continuation of Gravity"J.Geodesy and Geodynamics. 24. 9-18 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W., S.Okubo: "Effects of the Earth's curvature and radial heterogeneity in dislocation studies -For a point dislocation"Geophys.Res.Lett.. V.29, No.12. 46-1-46-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Okubo, S., W.Sun, T.Yoshino, T.Kondo, J.Amagai, H.Kiuchi, Y.Koyama, R.Ichikawa, M.Sekido: "Far-Field Deformation due to Volcanic Activity and Earthquake Swarm, Vistas for Geodesy in the New Millennium"International Association of Geodesy Symposi(Adam, J. and K.P.Schwarz (Eds.)). Volume 125. 518-522 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W., S.Okubo: "Co-seismic Geoid and Gravity Changes Detectable by Satellite Gravity Missions -Case Study of Alaska Earthquakes (1964, 2002)"Proceedings of [Precise Satellite Positioning: Study of Geodynamics by Satellite Gravity Missions], (Earthquake Research Institute, Tokyo University). Nov.11-12. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W: "Asymptotic Theory for Calculating Deformations Caused by Dislocations Buried in a Spherical Earth -Geoid Change"Journal of Geodesy. 77. 381-387 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W., S.Okubo: "Co-seismic Deformations Detectable by Satellite Gravity M0issions -a Case Study of Alaska (1964, 2002) and Hokkaido (2003) Earthquakes in the Spectral Domain"J.Geophys.Res.. (in printing). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Asymptotic Solution of Static Displacements Caused by Dislocations in a Spherically Symmetric Earth"J.Geophys.Res.. (in printing). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Asymptotic Theory for Calculating Deformations Caused by Dislocations Buried in a Spherical Earth -Gravity Change"Journal of Geodesy. (in printing). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun, W.: "Discretization Schemes in Downward Continuation of Gravity"Journal of Geodesy and Geodynamics. (in printing). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Sun W.: "Asymptotic theory for calculating deformations caused by dislocations buried in a spherical earth : geoid change"Journal of Geodesy. 77. 381-387 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Sun W.: "Asymptotic solution of static displacements caused by dislocations in a spherically symmetric earth"Journal of Geophysical Research. 印刷中(accepted). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Sun W., S.Okubo: "Effects of Earth's Spherical Curvature and Radial Heterogeneity in Dislocation Studies"Geophysical Research Letter. 29・12. 46-1-46-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Okubo, S., W.Sun, T.Yoshino, et al.: "Far-Field Deformation due to Volcanic Activity and Earthquake Swarm"International Association of Geodesy Symposia. 125. 518-522 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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