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2003 Fiscal Year Final Research Report Summary

Development of crust deformation monitor using GPS array data

Research Project

Project/Area Number 13308020
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

HORI Muneo  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (00219205)

Co-Investigator(Kenkyū-buntansha) OGUNI Kenji  The University of Tokyo, Earthquake Research Institute, Research Associate, 地震研究所, 助手 (20323652)
KATO Teruyuki  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (80134633)
Project Period (FY) 2001 – 2003
KeywordsGPS / inverse analysis / regional stress / regional strain / regional elasticity / optimization of non-linear problem / monitoring / large-scale numerical computation
Research Abstract

This research is aimed at developing a crust deformation monitor which continuously monitors the state of the Japanese Island by analyzing the nation-wide array of GPS. The key point of the monitor is the inverse analysis theory that predict a stress field by using data measured in a discrete and the equilibrium equation that stress satisfies. By comparing the measured strain and the predicted stress, the monitor is able to evaluate the mechanical state for instance, apparent mechanical properties are identified. The validity of the crust deformation monitor has been checked through a numerical experiment in which both stress and strain are known. It is shown that as the quality and quantity of the data increases, the monitor is able to find the stress and state of the target the uncertainty of the monitored variables is estimated. The monitor is applied to analyze actual data of the nation-wide GPS data during 1998-2002. In view of the quality of available data, the monitor seeks to identify the distribution of Poisson's ratio over the Japanese Islands, which is in harmony with the S-wave and P-wave structure which is identified through the artificial earthquake measurement. This shows the usefulness of the developed crust deformation monitor, although further modification and improvement is needed as the quantity of the measured data increase such modification can be more rationally made. In order to estimate the uncertainty of the monitored field variables, a new theory of stochastic modeling has been developed for continuum mechanics. The theory is being applied to the crust deformation monitor.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] M.Hori, T.Ichimura, H.Nakagawa: "Analysis of stochastic model : application to strong motion and fault problems"Structural Eng./Earthquake Eng., JSCE. 20. 11-24 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori, K.Oguni: "Two analysis methods for the crustal deformation of Japanese Islands"Key Engineering/Materials Vols.. 243-244. 493-498 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori, H.Nakagawa: "Numerical simulation of surface earthquake fault using spectral stochastic finite element method"Prediction and Simulation Methods in Geomechanics. 137-140 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori: "Stress inversion method for predicting local stress distribution of body in two-dimensional state of plane stress or strain"Mechanics of Materials. 35. 395-406 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori: "Application of spectral decomposition of Green's function to linear inverse problem"Engineering Analysis with Boundary Elements. 28. 183-193 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堀宗朗(編集委員): "構造工学ハンドブック"丸善. 2000 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hori, T.Ichimura, H.Nakagawa: "Analysis of stochastic model : application to strong motion and fault problems"Structural Eng./Earthquake Eng., JSCE. 20. 11-24 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori, K.Oguni: "Two analysis methods for the crustal deformation of Japanese Islands"Key Engineering/Materials. 243-244. 493-498 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori, H.Nakagawa: "Numerical simulation of surface earthquake fault using spectral stochastic finite element method"Prediction and Simulation Methods in Geomechanics. 137-140 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori: "Stress inversion method for predicting local stress distribution of body in two-dimensional state of plane stress or strain"Mechanics of Materials. 35. 395-406 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori: "Application of spectral decomposition of Green's function to linear inverse problem"Engineering Analysis with Boundary Elements. 28. 183-193 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hori (editors): "Handbook of Structure Engineering (in Japanese)"Maruzen. 2000 (2004)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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