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Research toward understanding earthquakes at ultra-low frequencies by analyzing satellite altimetry data.

Research Project

Project/Area Number 06402016
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) YOSHIDA Shigeo  University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (50262085)
TSUBOI Seiji  National Defense Academy, Department of Geoscience, Associate Professor, 地球科学科, 助教授 (90183871)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥17,600,000 (Direct Cost: ¥17,600,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1994: ¥13,000,000 (Direct Cost: ¥13,000,000)
KeywordsGeoid / Fault Motion / Altimetry / Satellite / Slow Earthquake / Silent Earthquake / Silent Earhquake
Research Abstract

We have detected a significant subsidence of the sea level of the Pacific near the coast of Peru and Chile after the 1994 Bolivia earthquake by analyzing the TOPEX/POSEIDON satellite altimetry data. The isotropic pattern of the sea surface change indicates the existence of isotropic implosion source with time scale of less than 10 days. This finding provides the evidence for the phase change of mantle minerals as a critical factor for deep earthquakes.
We presented a theory for displacement caused by a point dislocation in a radially heterogeneous spherical earth. The objective of this research was to constrain the fault model of the 1994 Bolivia earthquake by using GPS observations on the Pacific coast of the South American continent.
In order to achieve well constrained fault model, we investigate the possibility of using absolute gravity values which complement the geoid height change. For that purpose, we verified the 1 microgal precision of the new generation absolute gravimeter FG5 by collocation with superconducting gravimeters.

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Sun w.,and S.,Okubo: "Spheroidal Dispacement Due to Point Dislocations in a Spherical Earth(Part2) : Dislocation Love Numbers" Chinese J.Geophys.38. 89-101 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大久保修平: "地震による重力変化" 月刊地球-重力・測地・ジオダイナミクス. 号外11. 144-148 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Okubo S.,S.Yoshida,T.Sato,Y.Tamura and Y.Imanishi: "Verilying precision of a new generation absolute gravimeter FG5-comparison with superconducting gravimeters and detection of oceanic loeanic tide" Geophys.Res.Lett. 24巻(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sun W.,P.Vanicek and S.Okubo: "Global displacements caused by point dislocations in a realistic earth model" J.Geophys.Res. 101巻B4号. 8561-8577 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Okubo,S(ed.R.Teisseyre): "Theory of Earthquake Premonitory and Fracture Processes" Polish Scientific Publishers PWN,Warsaw, 648 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Okubo, S.: "Potential and gravity changes raised by dislocations" "Theory of Earthquake Premonitory and Fracture Processes", ed. R.Teisseyre, Polish Scientific Publishers PWN,Warsaw. 246-260 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sun W., and S.Okubo: "Spheroidal Displacement Due to Point Dislocations in a Spherical Earth (Part2) : Dislocation Love numbers" Chinese J.Geophys.38. 89-101 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sun W., P.Vanicek and S.Okubo: "Global displacements caused by point dislocations in a realistic earth model" J.Geophys. Res. 101, B4. 8561-8577 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Okubo, S., S.Yoshida, T.Sato, Y.Tamura and Y.Imanishi: "Verifying precision of a new generation absolute gravimeter FG5-comparison with superconducting gravimeters and detection of oceanic loading tide" Geophys. Res. Lett.24 (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Okubo, S.: "Gravity change due to an earthquake (in Japanese)" Chikyu Monthly, Speciall Issue 11 on Gravity, Geodesy and Geodynamics. 144-148 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sun,Vanicek and Okubo: "Global displacements caused by point dislocations in a realistic earth model" J.Geophys.Res. 101巻B4号. 8561-8577 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Okubo,Yoshida,Sato,Tamura and Imanishi: "Veritying precision of a new generation absolute gravimeter FG5-comparison・with superconducting gravimeters and detection of oceanic loading tide" Geophys.Res.Lett. 24巻(印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Sun Wenke,S Okubo: "Spheroidal Displacement Due to Point Dislocations in a Spherical Earth(Part2):Dislocation Love Numbers" Chinese J. Geophys.38. 89-101 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大久保修平: "地震による重力変化" 月刊地球-重力・測地・ジオダイナミックス. 号外11. 144-148 (1995)

    • Related Report
      1994 Annual Research Report

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

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