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Development of a new method for broadband ground-motion prediction based on simulations and observed records

Research Project

Project/Area Number 17K13000
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Natural disaster / Disaster prevention science
Research InstitutionNational Research Institute for Earth Science and Disaster Prevention

Principal Investigator

Iwaki Asako  国立研究開発法人防災科学技術研究所, マルチハザードリスク評価研究部門, 特別研究員 (30770309)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords強震動予測 / 広帯域地震動予測 / 地震動シミュレーション / 強震動 / 地震動予測 / 広帯域地震動 / 地盤震動特性 / 関東平野 / 首都直下地震 / 相模トラフ
Outline of Final Research Achievements

The applicability of the ground-motion prediction by deterministic simulations is limited to a certain period range due to the resolution of the source and the velocity models. Short-period ground motion (< ~1 s) is often simulated by stochastic or empirical approaches. We have proposed a method to simulate broadband ground motion taking advantage of the deterministically simulated long-period ground motion and the empirical ground-motion characteristics between long- and short-period bands. In this study we proposed several ways to update the method to apply it to strong-motion prediction in Kanto area, Japan, considering the difference in earthquake types and the detailed velocity structure model.

Academic Significance and Societal Importance of the Research Achievements

本研究で検討した広帯域地震動波形合成手法は,従来の手法における長周期帯域と短周期帯域の予測手法の違いによる不整合を解消し,震源モデルや地下構造モデルに基づく理論的アプローチによる長周期帯域の情報と観測記録から得られる経験的な地震動特性を生かした実用的な手法である.関東地域における想定活断層の多数シナリオに対する広帯域地震動の予測を行い,予測結果の集合が観測記録と比べて,適切な分布をしているかどうかという観点から検証を行っており,今後,信頼性の高い広帯域地震動予測波形を用いた地域の地震ハザード評価への展開につながることが期待される.

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2021 2019 2018 2017

All Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Presentation] 加速度エンベロープのWasserstein内挿を用いた広帯域地震動合成2021

    • Author(s)
      岡崎智久・八谷大岳・岩城麻子・前田宜浩・藤原広行
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Broadbandn Ground Motion from 3D Numerical Simulation with Empirical Ground-Motion Characteristics2019

    • Author(s)
      Asako Iwaki, Hiroyuki Fujiwara, Shigeki Senna
    • Organizer
      American Geophysical Union Fall Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 広帯域強震動の特性解明と予測手法の開発に関する研究2019

    • Author(s)
      岩城麻子
    • Organizer
      日本地震学会2019年秋季大会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 経験的地震動特性を用いた広帯域地震動合成手法の面展開2018

    • Author(s)
      岩城麻子・藤原広行
    • Organizer
      日本地震学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 周波数帯域間の地震動特性の関係性に基づく広帯域地震動合成法の面展開2017

    • Author(s)
      岩城麻子・森川信之・前田宜浩・藤原広行・今井隆太・高椋恵
    • Organizer
      日本地震工学会・大会-2017
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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