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2007 Fiscal Year Final Research Report Summary

Study on prediction of long period ground motions on sedimentary basins in Southwest Japan for huge subduction-zone

Research Project

Project/Area Number 18310123
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster science
Research InstitutionKyoto University

Principal Investigator

IWATA Tomotaka  Kyoto University, DPRI, Professor (80211762)

Co-Investigator(Kenkyū-buntansha) SATOH Toshimi  Tech. Center, Shimizu Corp., Principal researcher (00393562)
AOI Shin  NIED, 地震研究部, Principal researcher (80360379)
SEKIGUCHI Haruko  GSJ/AIST, 活断層研究センター, Researcher (20357320)
KAGAWA Takao  Geo-research Institute, 地球科学研究部門, Research group leader (50450911)
MIYAKOSHI Ken  Geo-research Institute, 地球科学研究部門地震防災グループ, Principal researcher (80450914)
Project Period (FY) 2006 – 2007
KeywordsNankai earthquake / long-period ground motions / prediction of strong ground motions / sedimentary basin / Oita basin / Osaka basin / source model / basin velocity structure model
Research Abstract

We studied long-period ground motions (>2seconds) in large sedimentary basins of South-Western Japan during huge subduction earthquakes. In the first year, we analyzed nation-wide strong motion network data to find sites that have long-period ground motion characteristics. In the South-Western Japan area, the Osaka and Oita basins could generate long-period ground motions. For the Osaka basin, there are plural underground velocity structure models for ground motion prediction. We validated the models by simulating ground motions for the 2004 Kii-Hanto-Toho-Oki event. Peak periods of observed ground motions can be explained by the simulations within 10%. For the Oita basin, there are few underground information and we conducted microtremor observations to estimate basin structures. We constructed underground velocity structure model for the Oita basin and confirmed the model by reproducing ground motions at Oita station for the 2000 Tottori earthquake.
Based on those analyses, we conducted long-period ground motion prediction for next hypothetical Nankai earthquake and compared the long-period ground motion characteristics. We pointed out that large long-period ground motions could attack both basin area during the next Nankai earthquake, especially for the Oita basin for the first time. We also developed the effect of source rupture scenarios of the events. For the Oita basin, ground motion levels would be changed between the source model of the East hypocenter model and that of the West hypocenter model.

  • Research Products

    (8 results)

All 2009 2008

All Journal Article (6 results) (of which Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] 大分平野における想定南海地震による長周期地震動のシミュレーション2009

    • Author(s)
      岩城麻子, 岩田知孝, 他
    • Journal Title

      地震 61(掲載決定)

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Long-period ground motion simulation in Oita basin for the hypothetical Nankai earthquake2009

    • Author(s)
      Iwaki, A., T. Iwata, H. Sekiguchi, K. Asano, M. Yoshimi, H. Suzuki
    • Journal Title

      J. Seism. Soc. Japan (Zisin) 61(in print)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Validation of 3D basin structure models for long-period ground motion simulation in the Osaka basin, western Japan2008

    • Author(s)
      Iwaki, A., T. Iwata
    • Journal Title

      Journal of Seismology 12

      Pages: 197-215

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Basin and crustal structure models for the simulation of strong ground motions in the Kinki area, Japan2008

    • Author(s)
      Iwata, T., T. Kagawa, A. Petukhin, Y. Ohnishi
    • Journal Title

      Journal of Seismology 12

      Pages: 223-234

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Validation of 3D basin structure models for longperiodground motion simulation in the Osaka basin, western Japan2008

    • Author(s)
      Iwaki, A., T. Iwata
    • Journal Title

      J. Seismology 12

      Pages: 197-215

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Basin and crustal structure models for the simulation of strong ground motions in the Kinki area, Japan2008

    • Author(s)
      Iwata, T., T. Kagawa, A. Petukhin, Y. Ohnishi
    • Journal Title

      J. Seismology 12

      Pages: 223-234

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 大分平野における想定南海地震による長周期地震動のシミュレーション2008

    • Author(s)
      岩城麻子, 岩田知孝, 吉見雅行, 関口春子
    • Organizer
      日本地球惑星科学連合2008年大会
    • Place of Presentation
      千葉・幕張メッセ
    • Year and Date
      2008-05-27
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Long-period ground motion simulation for the hypothetical Nankai earthquake in Oita sedimentary basin2008

    • Author(s)
      Iwaki, A., T. Iwata, H. Sekiguchi, M. Yoshimi
    • Organizer
      Japan Planets and Geoscience Society
    • Place of Presentation
      Makuhari Chiba
    • Year and Date
      2008-05-27
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2010-06-09  

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