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Inversion of subsurface physical parameters using modem optimization methods

Research Project

Project/Area Number 15510147
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster science
Research InstitutionTokyo Institute of Technology

Principal Investigator

YAMANAKA Hiroaki  Tokyo Institute of Technology, Dept.of Environmental Science and Tech., Assoc.Prof., 大学院・総合理工学研究科, 助教授 (00212291)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsGenetic algorithms / Simulated annealing / Tabu search / phase velocity / resistivity / Q-value / Neural Network / Geophysical exploration / 表面波 / 微動アレイ探査 / ニュートラルネットワーク / 初動走 / 遺伝的アルゴリズム / 初動走時
Research Abstract

Inversion of subsurface physical parameters from earthquake or microtremor data is one of the often used works in Earthquake Engineering. Usually least-square method is applied in the inversion. However, we have difficulties to find an optimal model because of nonlinear characteristics of misfit function to be minimized. Recently several modem optimization methods without use of gradient information of misfit surface are developed in the field of operation research. In this study, we investigated applicability of heuristic search methods in inversion of wave data.
First, three heuristic search methods, Genetic Algorithm, Simulated Annealing and Tabu Search are implemented to invert Rayleigh wave phase velocity for shallow S-wave velocity profiling. Unlike linearized least-squares inversion, they do not require derivative calculation, or an initial mode, only the forward modeling calculation. The performances of the three heuristic techniques are compared with numerical experiments. With … More common paramerization and search limits, the three algorithms can reconstruct well shallow S-wave profiles with and without a velocity reversal from the synthetic data without any specific initial models. The Genetic Algorithms and the Simulated Annealing show a fast convergence of the misfits. However, the Simulated Annealing can find models with the smallest misfits. It is also found that the decrease of the misfits is the most gradual in the Tabu Search. Next we applied the three methods to inversion of spectral ratios of earthquake records from a vertical bore hole array to estimate S-wave velocity and Q-values. We can observe the same conclusions as obtained above. Furthermore the simulated annealing is used to a joint inversion of resistivity sounding data and microtrernor H/V spectral data. We can estimate resistivity and S-wave profiles simultaneously from this joint inversion. Finally, neural network technique is applied to automatic estimation of onset times of initial P-and S-waves. We can estimate travel time delays due to sedimentary layers in Tokyo area from the estimated travel time data. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (13 results)

All 2005 2004 Other

All Journal Article (12 results) Publications (1 results)

  • [Journal Article] Comparison of performance of heuristic search methods for phase velocity inversion in shallow surface wave methods2005

    • Author(s)
      H.Yamanaka
    • Journal Title

      Journal Environmetal and Engineering Geophysics (accepted)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 微動アレイ観測による四国主要平野でのS波速度構造の推定2005

    • Author(s)
      山中浩明, 元木健太郎, 他
    • Journal Title

      日本地震工学会大会-2004梗概集

      Pages: 332-333

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Comparison of performance of heuristic search methods for phase velocity inversion in shallow surface wave methods2005

    • Author(s)
      H.Yamanaka
    • Journal Title

      Journal Environmental and Engineering Geophysics (accepted)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Application of heuristic search methods in inversion of spectral ratio of earthquake data form vertical array2005

    • Journal Title

      Proc.23rd symposium on natural disaster science(in Japanese)

      Pages: 55-56

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 3D S-wave velocity model of the Kanto basin using Rayleigh wave phase velocity2005

    • Journal Title

      Proc 111th symposium of SEGJ(in Japanese)

      Pages: 65-66

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Microtremor array exploration in Shikoku area2005

    • Journal Title

      Proc.3rd annual meeting of JAEE(in Japanese)

      Pages: 332-333

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Application of heuristic search methods to phase velocity inversion in microtremor array exploration2004

    • Author(s)
      H.Yamanaka
    • Journal Title

      Proc.13^<th> World Conf.Earthquake Engineering (CDROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] ニューラルネットワークによる強震記録の初動走時の評価-関東地方周辺での堆積層による走時遅れの推定-2004

    • Author(s)
      山中浩明, 枇谷亜紀, 山田伸之
    • Journal Title

      物理探査 57

      Pages: 255-266

    • NAID

      10013467288

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 鉛直アレイデータの逆解析におけるヒューリスティック・サーチ法の適用性について2004

    • Author(s)
      山中浩明
    • Journal Title

      第23回日本自然災害学会学術講演会講演概要集

      Pages: 55-56

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] レイリー波の位相速度に基づく関東平野の3次元S波速度構造2004

    • Author(s)
      山中浩明, 山田伸之, 駒場信彦
    • Journal Title

      第111回物理探査学会学術講演論文集

      Pages: 65-66

    • NAID

      10013545451

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Application of heuristic search methods to phase velocity inversion in microtremor array exploration2004

    • Author(s)
      H.Yamanaka
    • Journal Title

      Proc.13th World Conference on Earthquake Engineering (CDROM), No.1161

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Estimation of arrival times of initial P and S waves in strong motion records using artificial neural networks2004

    • Author(s)
      H.Yamanaka, A.Hidani, N.Yamada
    • Journal Title

      Geophysical exploration(in JapaneseO) Vol.57

      Pages: 255-266

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 山中浩明, 枇谷亜紀, 山田伸之: "ニューラルネットワークによる強震記録の初動走時の読み取り"第22回日本自然災害学会学術講演会講演概要集. 25-26 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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