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Do the gravity and geoid height changes accumulate during the course of earthquake cycle?

Research Project

Project/Area Number 13440130
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

OKUBO Shuhei  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (30152078)

Co-Investigator(Kenkyū-buntansha) SUN Wenke  The University of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (10323651)
FURUYA Masato  The University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (60313045)
HIBIYA Toshiyuki  The University of Tokyo, Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (80192714)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥11,600,000 (Direct Cost: ¥11,600,000)
Fiscal Year 2003: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2002: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsViscoelasticity / Gravity / Fault motion / Active faults
Research Abstract

We formulated the gravity, geoid height and elevation changes due to fault motoin in a Maxwell viscoelastic earth. The formulation is implemented to a FORTRAN computer code, which enables us to compute interseismic gravity/elevation changes during an earthquake cycle based on the Savage's backslip model. We applied the technique to the interseismic deformation around the Tokai area where the Philippine Sea plate is subducting beneath the Eurasian plate.
The model successfully reproduces the steady subsidence when we assume reasonable viscosity profile and asperity distribution. On the contrary, we find the computed gravity change rate is significantly larger than the observed one. The result casts profound doubt on the validity of the Savage's supposition that no deformation accumulates over repeated seismic cycles.
We applied the formulation to the analysis of gravity change before and after the Tokachi-oki Earthquake (M8.1, September 26, 2003). To be more specific, we calculated the interseismic gravity change rate to reduce the absolute gravity value taken several years before the earthquake to the one just before the earthquake. When compared with the absolute gravity value just after the earthquake, it enables us to estimate the coseismic gravity change. The change agrees well with the theoretically predicted one.

Report

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

Research Products

(34 results)

All Other

All Publications

  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2003 Final Research Report Summary
  • [Publications]

    • Related Report
      2003 Annual Research Report
  • [Publications]

    • Related Report
      2003 Annual Research Report
  • [Publications]

    • Related Report
      2003 Annual Research Report
  • [Publications]

    • Related Report
      2003 Annual Research Report
  • [Publications]

    • Related Report
      2002 Annual Research Report
  • [Publications]

    • Related Report
      2002 Annual Research Report
  • [Publications]

    • Related Report
      2002 Annual Research Report
  • [Publications]

    • Related Report
      2002 Annual Research Report
  • [Publications]

    • Related Report
      2002 Annual Research Report
  • [Publications]

    • Related Report
      2001 Annual Research Report
  • [Publications]

    • Related Report
      2001 Annual Research Report
  • [Publications]

    • Related Report
      2001 Annual Research Report

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

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