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Development of upconversion technique for subsurface structure modeling based on large amounts of data using multi-array microtremors

Research Project

Project/Area Number 21H01588
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 25030:Disaster prevention engineering-related
Research InstitutionKagawa University

Principal Investigator

Chimoto Kosuke  香川大学, 創造工学部, 准教授 (40713409)

Co-Investigator(Kenkyū-buntansha) 山中 浩明  東京工業大学, 環境・社会理工学院, 教授 (00212291)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2021: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Keywords地下構造モデル / マルチアレイ微動 / 地震波干渉法 / アレイ微動観測 / ストレッチング法
Outline of Research at the Start

強震動予測のため、適切な地下構造モデルを作成することは重要である。現在では日本全国の地下構造モデルが提案されているが、改良の必要性があることもわかってきた。しかし、これまでと同じのやり方で日本全国のモデル更新を行うことは、果てしない時間と労力がかかる。そこで、一からモデルを推定するのではなく、地下構造に依存する関数の変化量を捉え、モデルの変化量を推定することでモデルを改良する手法の開発に取り組む。マルチアレイ微動観測により空間的に大量のデータを取得し、各点における単純な関数を推定してその空間変化を捉える。この手法によりモデルの効率的な改良とアップコンバージョンが期待できる。

Outline of Final Research Achievements

To improve subsurface structure models which are required for the earthquake ground motion prediction, we developed an model upconversion technique which estimates the subsurface structure velocity change from large amount of microtremor and seismic observation data. We demonstrated the feasibility of a novel technique to estimate subsurface velocity structure model that exploits the existing seismic records to estimate the seismic velocity structure with high density and accuracy, and those structures were interpolated by capturing the spatial elastic wave velocity change by measuring a large amount of data from multi-array microtremor observations.

Academic Significance and Societal Importance of the Research Achievements

地震動予測のため、適切な地下構造モデルを作成することは重要であるが、現在のモデルには改良の必要性があることがわかってきている。そこでこれまでとは異なり、地下構造に依存する関数の変化量を捉え、モデルの変化量を推定する新しいモデル化手法を開発した。安価ながらも反射法地震探査による反射断面と類似した地下構造モデルを推定することができたことは、この手法の適用可能性が高いことを示した。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (14 results)

All 2024 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (11 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] High-resolution spatial elastic wave velocity variation detected using multiple-linear-array microtremor measurements2024

    • Author(s)
      Kosuke Chimoto, Hiroaki Yamanaka
    • Journal Title

      Exploration Geophysics

      Volume: - Issue: 3 Pages: 288-301

    • DOI

      10.1080/08123985.2024.2323473

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Sedimentary <i>P</i>- and <i>S</i>-Wave Velocity Structures in Shimousa Region of Kanto Basin Determined from Joint Autocorrelation and Receiver Function Analysis2023

    • Author(s)
      Chimoto Kosuke
    • Journal Title

      Bulletin of the Seismological Society of America

      Volume: 113 Issue: 5 Pages: 1867-1877

    • DOI

      10.1785/0120230058

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Joint Autocorrelation and Receiver Function Analysis of Sedimentary Structures Using Strong Ground Motion Records2022

    • Author(s)
      Chimoto Kosuke
    • Journal Title

      Pure and Applied Geophysics

      Volume: 179 Issue: 8 Pages: 2757-2768

    • DOI

      10.1007/s00024-022-03099-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] 1995年兵庫県南部地震の被害地域における微動アレイ探査による表層地盤の推定2024

    • Author(s)
      地元孝輔
    • Organizer
      2024年度日本建築学会大会(関東)
    • Related Report
      2023 Annual Research Report
  • [Presentation] Estimation of Nagao Fault using multi-linear-array microtremor2024

    • Author(s)
      Kosuke Chimoto
    • Organizer
      Japan Geoscience Union Meeting 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Multiple linear array microtremor measurement across the Nagao Fault2024

    • Author(s)
      Kosuke Chimoto
    • Organizer
      The 6th edition of Asia Pacific Meeting on Near Surface Geoscience and Engineering
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Estimation of sedimentary velocity structures of Kanto Basin using ground motion records induced by natural earthquakes2024

    • Author(s)
      Kosuke Chimoto
    • Organizer
      The 6th edition of Asia Pacific Meeting on Near Surface Geoscience and Engineering
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 近地地震記録のレシーバー関数と自己相関関数による関東平野の地震波速度構造モデルの推定2024

    • Author(s)
      地元孝輔
    • Organizer
      物理探査学会 第150回(2024年度春季)学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 1927年北丹後地震の被害地域における微動アレイ探査2023

    • Author(s)
      地元孝輔
    • Organizer
      2023年度日本建築学会大会(近畿)
    • Related Report
      2023 Annual Research Report
  • [Presentation] 北海道むかわ町における高密度リニアアレイ微動観測による空間速度変化の推定2023

    • Author(s)
      地元孝輔
    • Organizer
      第16回日本地震工学シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 最新の地下構造モデル化手法の関東平野への適用事例2023

    • Author(s)
      地元孝輔
    • Organizer
      第51回地盤震動シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 地震波干渉法理論に基づく強震記録のレシーバー関数と自己相関関数の同時解析による地盤構造の推定2021

    • Author(s)
      地元孝輔
    • Organizer
      日本地震学会秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 地震波干渉法理論に基づく強震記録のレシーバー関数と自己相関関数の同時解析による下総地域の地盤構造の推定2021

    • Author(s)
      地元孝輔
    • Organizer
      物理探査学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] SEDIMENTARY STRUCTURE IMAGING OF THE KANTO BASIN WITH STRONG MOTION RECORD APPLIED TO SEISMIC INTERFEROMETRY2021

    • Author(s)
      Kosuke Chimoto, Hiroaki Yamanaka
    • Organizer
      The 6th IASPEI / IAEE International Symposium: Effects of Surface Geology on Seismic Motion August 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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