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Estimation of three dimensional ground structure in Fukui Plain based on inversion analysis of observed ground motion

Research Project

Project/Area Number 13650518
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 構造工学・地震工学
Research InstitutionFukui University

Principal Investigator

KOJIMA Keisuke  Fukui University, Dept. of Architecture & Civil Engineering, 工学部, 助教授 (40205381)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
KeywordsSeismic Observation / Microtremor / H / V Ratio / Predominant Period / S wave Velocity / Sedimentary Structure / Inversion / 3-dim. Ground Structure / 推積構造 / 3次元地盤構造モデル
Research Abstract

During the 1948 Fukui earthquake, most of the heavily damaged areas concentrated in the Fukui plain covered with thick quaternary deposits. This suggests that the sedimentary structure can be one of the most important factors to elucidate the damage distribution. Firstly, I propose an inversion procedure of underground structure based on the earthquake observation records, assuming a multi-reflection of vertically propagating SH-wave in a horizontally layering system. The procedure is formulated as an optimization problem to find the thickness and Q-values of each layer which minimize the different between calculated and measured Fourier spectra. Applying this inversion procedure to the actual strong earthquake records observed at the stations deploying in the center of Fukui plain, I calculated 2D S-wave velocity structure beneath the plain up to the tertiary. It was confirmed that the identified underground structure give a fairly good agreement between monitored and calculated responses, and that estimated structure is harmonized with PS-logging data and P-wave reflection survey. Secondary, 3-dimensional Quaternary structure around Fukui plain was explored based on the microtremor observation. The microtremor observations on the ground surface were carried out every small grid that covered the Fukui pain. Predominant periods and H/V ratios of each site were specified from collected Fourier and H/V spectra. By assuming S wave velocity structures, the thickness of Quaternary system of the sites were estimated based on the predominant periods. By applying the procedure to the sited having little ground condition data, one may be able predict the strong earthquake response with a good accuracy.

Report

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

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 小嶋 啓介: "強震観測に基づく福井平野の動的構造の検討"応用地質. 44巻1号. 94-103 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 小嶋 啓介: "常時微動に基づく福井平野の堆積構造の推定(序報)"日本海地域の自然と環境. 第9号. 15-20 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 小嶋 啓介: "福井平野の地震動特性とS波速度構造に関する検討"日本海地域の自然と環境. 第8号. 11-20 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Kojima, H.Nakayama: "Estimation of ground structure in Fukui plain based on observed earthquake ground motion"Journal of the Japan Society of Engineering Geology. Vol.44, No.2. 94-105 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Kojima: "Estimation of sedimentary structure in Fukui Plain based on microtremor observation"Nature and Environment of The Sea of Japan Districts. No.9. 15-20 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Kojima, H.Nakayama: "Consideration of earthquake ground motions and S-wave velocity structure in Fukui Plain"Nature and Environment of The Sea of Japan Districts. No.9. 11-20 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 小嶋 啓介: "強震観測に基づく福井平野の動的構造の検討"応用地質. 44巻1号(掲載決定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小嶋 啓介: "常時微動に基づく福井平野の推積構造の推定(序報)"日本海地域の自然と環境. 第9号. 15-20 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小嶋 啓介: "福井平野の地震動特性とS波速度構造に関する検討"日本海地域の自然と環境. 第8号. 11-20 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小嶋啓介, 山中浩明: "福井平野の地震動特性とS波速度構造に関する検討"日本海地域の自然と環境. 第8号. 11-20 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小嶋啓介, 中田光昭: "観測地震動の逆解析に基づく福井平野の動的物性定数の推定"第36回地盤工学研究発表会講演集. 2735-2736 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小嶋啓介, 山中浩明: "強震観測に基づく福井平野の動的構造の検討"第26回地震工学研究発表会論文集. 277-280 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小嶋啓介, 山中浩明: "福井平野における強震観測およびS波速度構造に関する検討"平成13年度日本応用地質学会中部支部研究発表会予稿集. 57-60 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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