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Ground Structure and Strong Motions in the Grenoble Basin

Research Project

Project/Area Number 18404006
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Natural disaster science
Research InstitutionKYUSHU UNIVERCITY

Principal Investigator

KAWASE Hiroshi  KYUSHU UNIVERCITY, Faculty of Human-Environment Studies, Professor (30311856)

Co-Investigator(Kenkyū-buntansha) IWATA Tomotaka  Kyoto University, Disaster Prevention Research Institute, Professor (80211762)
IRIKURA Kojiro  Kyoto University, Professor Emeritus (10027253)
SATO Toshiaki  Shimizu Corporation, Institute of Technology, Senior Researcher (80393560)
SATOH Toshimi  Shimizu Corporation, Institute of Technology, Chief Researcher (00393562)
SASATANI Tsutomu  Hokkaido University, faculty of Engineering, 教授 (10002148)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥4,890,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2006: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsArray Microtremors / Strong Motions / Sedimentary Basin / Grenoble / Underground Structure
Research Abstract

What we would like to clarify in the present study is whether the estimation of strong ground motion and the estimation of damage scheme that Japan has developed aggressively in these years are similarly effective in Europe where the geological environment is different very much from Japan. To this end we investigated the underground structure of the Grenoble basin by using microtremor measurement in cooperation with the Grenoble University in France who offered us a joint research for the purpose. We then perform ground motion prediction study for the Grenoble city. It is expected to show that the strong ground motion prediction technology that has been developed as a Japanese original technology has the generality that can be applied to the region where the geological environment is quite different.
The extremely long duration of the seismic ground motion were observed in the Laffrey 2005 event that had been occurred in the south of the Grenoble basin in 2005. We first extract information of duration and wave energy in comparison to the other events. We also use simulation results of the three-dimensional finite difference methods for the Grenoble basin. It was able to be pointed out that a long duration can be introduced if we assume considerably weak surface layers on top of the surrounding rock formations. As is quite natural an introduction of soft layers on top of sediments makes duration even longer and successfully reproduces durations at most of the site within the basin. However, very long duration in the northeastern part of the basin can only be explained by considering the very soft, weathered layer.
On the other hand, it has been understood that the analysis of the ground survey in the region is advanced, and a weak surface of the layer thickness of about 25m exists in the surface in boring and the array measurement of microtremors. Therefore, the possibility of the soft surface sediments is high that create very long duration in the observed waveforms.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (11 results)

All 2007 2006

All Journal Article (8 results) (of which Peer Reviewed: 1 results) Presentation (3 results)

  • [Journal Article] Analysis of ground motions in Grenoble valley and simulation for the Laffrey2005 earthquake(M2.8)2007

    • Author(s)
      Umeda, N., H.Kawase, S.Tsuno
    • Journal Title

      Proceedings of Japan Geoscience Union(JPGU)Meeting (CD-ROM)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Borehole Observation for Site Effect Studies2006

    • Author(s)
      Hiroshi Kawase
    • Journal Title

      Proc.of Third International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, France 1(CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Separation of Observed Ground Motion Spectra to Get Site Amplification Factors : Linearity and Nonlinearity2006

    • Author(s)
      Hiroshi Kawase, Yusuke Nejime
    • Journal Title

      Proc.of Third International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, France 1(CD-ROM)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Site Effects Derived from Spectral Inversion Method for K-NET, KiK-net, and JMA Strong-Motion Network with Special Reference to Soil Nonlinearity in High PGA Records2006

    • Author(s)
      Hiroshi Kawase
    • Journal Title

      Bull.Earthq.Res.Inst.,Univ.Tokyo Vol.81

      Pages: 309-315

    • NAID

      120000869655

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Borehole Observation for Site Effect Studies2006

    • Author(s)
      Hiroshi Kawase
    • Journal Title

      Proc.of Third International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, France

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Separation of Observed Ground Motion Spectra to Get Site Amplification Factors : Linearity and Nonlinearity2006

    • Author(s)
      Hiroshi Kawase, Yusuke Nejime
    • Journal Title

      Proc.of Third International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, France

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Site Effects Derived from Spectral Inversion Method for K-NET, KiK-net, and JMA Strong-Motion Network with Special Reference to Soil Nonlinearity in High PGA Records2006

    • Author(s)
      Hiroshi Kawase
    • Journal Title

      Bull.Earthq.Res.Inst., Univ.Tokyo Vol.81

      Pages: 309-315

    • NAID

      120000869655

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Borehole Observation for Site Effect Studies2006

    • Author(s)
      Hiroshi Kawase
    • Journal Title

      Proc. of Third International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, France, 30 August-1 September 1(CD-R)

    • Related Report
      2006 Annual Research Report
  • [Presentation] フランス・グルノーブル盆地における Laffrey 地震M2.8の観測地震動の分析及びそのシミュレーション2007

    • Author(s)
      梅田尚子・川瀬博
    • Organizer
      地球惑星科学連合合同大会
    • Place of Presentation
      千葉、幕張メッセ
    • Year and Date
      2007-05-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] フランス・グルノーブル盆地におけるLaffrey地震M2.8の観測地震動の分析及びそのシミュレーション2007

    • Author(s)
      梅田 尚子・川瀬 博
    • Organizer
      地球惑星科学連合合同大会
    • Place of Presentation
      千葉、幕張メッセ
    • Year and Date
      2007-05-27
    • Related Report
      2007 Annual Research Report
  • [Presentation] 観測強震記録のスペクトルインバージョンで分離した統計的地震動特性に含まれる予測誤差2007

    • Author(s)
      祢占 雄介・川瀬 博
    • Organizer
      地球惑星科学連合合同大会
    • Place of Presentation
      千葉、幕張メッセ
    • Year and Date
      2007-05-27
    • Related Report
      2007 Annual Research Report

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Published: 2006-04-01   Modified: 2016-04-21  

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