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Next-generation Japan Integrated Velocity Structure Model by data-driven analyses

Research Project

Project/Area Number 19H00807
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 25:Social systems engineering, safety engineering, disaster prevention engineering, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Koketsu Kazuki  東京大学, 地震研究所, 名誉教授 (90134634)

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)
古村 孝志  東京大学, 地震研究所, 教授 (80241404)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥45,370,000 (Direct Cost: ¥34,900,000、Indirect Cost: ¥10,470,000)
Fiscal Year 2021: ¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
Fiscal Year 2020: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2019: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Keywords地下構造モデル / 地殻構造モデル / 地盤構造モデル / 地震動シミュレーション
Outline of Research at the Start

全国1次地下構造モデルが構築され,推計200件以上の研究論文で引用され利用されているが,広く利用されるにつれていろいろな不具合の報告がなされ,決して完璧なものではないことが明らかになってきた.一方で,大量の地震動の観測データやシミュレーション結果からモデルを直接推定する,データ駆動型の地下構造モデル化手法が提案されつつある.本研究では地殻構造モデル,地盤構造モデル,地震動シミュレーションの各分野の先端的研究者で理工連携の研究チームを構成して,これらモデル化手法を全国地下1次地下構造モデルの枠組みに適用し,その不具合を解消しながら,次世代全国地下構造モデルを構築する.

Outline of Final Research Achievements

We collected the results of refraction surveys in the sea area, reexamined the structure of the accretionary prism along the Nankai Trough and the Japan Trench, and the crustal structure of southwestern Japan, and revised the velocity structure model. We developed a next-generation velocity structure estimation method based on large-scale numerical simulation and assimilation of dense array seismic observation data. A ground motion simulation was performed using a three-dimensional S-wave velocity structure obtained by reanalyzing microtremor data in the Tokyo metropolitan area with the MCMC method.
A next-generation Japan Integrated Velocity Structure Model (Japan Integrated Velocity Structure Model Version 2) was constructed by comprehensively using the velocity structure modeling methods described above.

Academic Significance and Societal Importance of the Research Achievements

構築された全国2次地下構造モデルは,現在,広く使われている全国1次地下構造モデルの精度の高い後継として,学術的・社会的意義が高い.また,太平洋プレートの地殻・マントルの不均質構造を,地震波速度の異方性を含めて詳細に評価した.特に,本研究で新規に評価する速度異方性については,長周期地震動の波形振幅や継続時間等に与える影響を検討し,今後の地下構造モデル整備の方向性を示した.首都圏の3次元モデルでは,推定誤差が及ぼす地震動評価結果への影響を検討した.さらに,首都圏での検討結果を踏まえて,熊本平野などの他地域でも微動観測データの分析を行い,地下構造のモデル化の推定精度に関する検討を行った.

Report

(5 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Comments on the Screening Results   Annual Research Report
  • Research Products

    (28 results)

All 2023 2022 2021 2020 2019 Other

All Journal Article (11 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 11 results,  Open Access: 4 results) Presentation (13 results) (of which Int'l Joint Research: 2 results) Book (3 results) Remarks (1 results)

  • [Journal Article] Estimation of source, path, and site factors of S waves recorded at the S-net sites in the Japan Trench area using the spectral inversion technique2023

    • Author(s)
      Dhakal Yadab P.、Kunugi Takashi、Yamanaka Hiroaki、Wakai Atsushi、Aoi Shin、Nishizawa Azusa
    • Journal Title

      Earth, Planets and Space

      Volume: 75 Issue: 1

    • DOI

      10.1186/s40623-022-01756-6

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Distinctive seismic reflections from the subducting Pacific slab for earthquakes in the Ryukyu arc2022

    • Author(s)
      Furumura, T. and B. L. N. Kennett
    • Journal Title

      Geophysical Journal International

      Volume: 233 Issue: 2 Pages: 1213-1228

    • DOI

      10.1093/gji/ggac514

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Azimuthal dependence on amplifications for long-period ground motions propagating in the Kanto Basin, Japan2022

    • Author(s)
      Tsuno, S., M. Noyori, and H. Yamanaka
    • Journal Title

      Journal of Seismology

      Volume: 26 Issue: 2 Pages: 373-385

    • DOI

      10.1007/s10950-022-10072-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Azimuthal Variation of Lithospheric Heterogeneity in the Northwest Pacific Inferred From Po/So Propagation Characteristics and Anomalously Large Ground Motion of Deep In-Slab Earthquakes2021

    • Author(s)
      Furumura, T. and B. L. N. Kennett
    • Journal Title

      Journal of Geophysical Research

      Volume: 126 Issue: 5

    • DOI

      10.1029/2021jb021717

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] High-resolution source imaging based on time-reversal wave propagation simulations using assimilated dense seismic records2020

    • Author(s)
      Furumura Takashi、Maeda Takuto
    • Journal Title

      Geophysical Journal International

      Volume: 225 Issue: 1 Pages: 140-157

    • DOI

      10.1093/gji/ggaa586

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Variability of Ground Motion Simulation due to Aleatory Uncertainty of Source Parameters2020

    • Author(s)
      引田智樹・纐纈一起・三宅弘恵
    • Journal Title

      Journal of Japan Association for Earthquake Engineering

      Volume: 20 Issue: 3 Pages: 3_21-3_34

    • DOI

      10.5610/jaee.20.3_21

    • NAID

      130007818541

    • ISSN
      1884-6246
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Propagation of distinct Love-wave pulses from regional to teleseismic distances in continental and oceanic environments2020

    • Author(s)
      Furumura, T. and BLN Kennett
    • Journal Title

      Geophysical Journal International

      Volume: 221 Issue: 1 Pages: 665-692

    • DOI

      10.1093/gji/ggaa028

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Data Assimilation‐Based Early Forecasting of Long‐Period Ground Motions for Large Earthquakes Along the Nankai Trough2020

    • Author(s)
      Oba Atsuki、Furumura Takashi、Maeda Takuto
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 125 Issue: 6 Pages: 1-19

    • DOI

      10.1029/2019jb019047

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Tuning <i>S</i>-Wave Velocity Structure of Deep Sedimentary Layers in the Shimousa Region of the Kanto Basin, Japan, Using Autocorrelation of Strong-Motion Records2020

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

      Bulletin of the Seismological Society of America

      Volume: 110 Issue: 6 Pages: 2882-2891

    • DOI

      10.1785/0120200156

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] S-wave velocity structure exploration of sedimentary layers using seismic interferometry on strong motion records2019

    • Author(s)
      Chimoto, K. and H. Yamanaka
    • Journal Title

      Exploration Geophysics

      Volume: 50 Pages: 625-633

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Rupture process of the 2018 Hokkaido Eastern Iburi earthquake derived from strong motion and geodetic data2019

    • Author(s)
      Kobayashi Hiroaki、Koketsu Kazuki、Miyake Hiroe
    • Journal Title

      Earth, Planets and Space

      Volume: 71 Issue: 1

    • DOI

      10.1186/s40623-019-1041-7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 点震源地震動の近地項の幾何減衰と放射パターン2022

    • Author(s)
      纐纈一起
    • Organizer
      Japan Geoscience Meeting 2022
    • Related Report
      2021 Annual Research Report
  • [Presentation] 東京湾西岸部における1次元浅部深部統合地盤モデルの構築2022

    • Author(s)
      津野靖士,山中浩明,地元孝輔,宮腰寛之,高井伸雄, 神野達夫,重藤迪子,是永将宏,三宅弘恵,松島信一;
    • Organizer
      日本地震工学会2022年度大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 波形逆解析に関する計算コードの共有化への試み2022

    • Author(s)
      山田伸之・笠松健太郎・山中浩明
    • Organizer
      物理探査学会第143回学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 震源断層近傍の長周期パルスと地殻変動を考慮した2016 年熊本地震の破壊過程2020

    • Author(s)
      岩井創・纐纈一起・小林広明
    • Organizer
      日本地震学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] プレート間巨大地震の強震動生成域のための距離減衰式2020

    • Author(s)
      宮澤理稔・木内亮太・纐纈一起
    • Organizer
      日本地震学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 三次元S波速度構造モデル高精度化のための波形インバージョンに基づく二次元構造推定法の有用性の検証2020

    • Author(s)
      笠松健太郎,山中浩明
    • Organizer
      物理探査学会第143回学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] MCMC法を用いたレイリー波位相速度の逆解析による関東平野の深部地盤構造の推定2020

    • Author(s)
      山中浩明,サイフディン,山田伸之,地元孝輔
    • Organizer
      物理探査学会第143回学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 地震観測データと逆伝播計算のデータ同化に基づく震源即時推定2020

    • Author(s)
      古村孝志・前田拓人
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] Azimuthal variation of lithospheric heterogeneity in the northwest Pacific inferred from Po/So propagation characteristics2020

    • Author(s)
      Takashi Furumura & BLN Kennett
    • Organizer
      日本地震学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] MCMC法による逆解析を用いた関東平野の位相速度データの再解析2019

    • Author(s)
      山中浩明・地元孝輔・山田伸之
    • Organizer
      物理探査学会第141回学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Propagation of distinctive Love-wave pulses in continental and oceanic environment2019

    • Author(s)
      古村孝志・B. L. N. Kennett
    • Organizer
      日本地震学会2019年秋期大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Regional to teleseismic distance propagation of distinctive Love-wave pulses in continental and oceanic environments2019

    • Author(s)
      Furumura, T. and B. L. N. Kennett
    • Organizer
      2019 AGU Fall Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Subsurface Structure of the Kathmandu Valley Revealed by Seismic Reflection and Gravity Surveys2019

    • Author(s)
      Yusuke Kawasaki, Kota Koshika, Om Pradhan, Hideki Kurosawa, Kohei Abe, Masato Yamamoto, Dai Nobuoka, Yoshikazu Matsubara, Monika Jha, Chintan Timsina, Suresh Shrestha, Prakash Pokhrel, Dinesh Nepali, Mukunda Bhattarai, Soma Nath Sapkota, Hisanori Matsuyama, Hiroe Miyake, Kazuki Koketsu
    • Organizer
      2019 AGU Fall Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Book] Ground Motion Seismology2021

    • Author(s)
      Kazuki Koketsu
    • Total Pages
      341
    • Publisher
      Springer
    • ISBN
      9811585695
    • Related Report
      2020 Annual Research Report
  • [Book] 地震 ーどのように起きるのか2020

    • Author(s)
      纐纈 一起
    • Total Pages
      146
    • Publisher
      丸善出版
    • ISBN
      4621305093
    • Related Report
      2020 Annual Research Report
  • [Book] 地震: どのように起きるのか2020

    • Author(s)
      纐纈 一起
    • Total Pages
      192
    • Publisher
      丸善出版
    • ISBN
      4621305093
    • Related Report
      2019 Annual Research Report
  • [Remarks] 全国地下構造モデル

    • URL

      http://taro.eri.u-tokyo.ac.jp/saigai/computer.html#2008

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2024-01-30  

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