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Tsunami generation: strain accumulation in crust and diversity of earthquake rupture process

Research Project

Project/Area Number 19K04021
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionNational Research Institute for Earth Science and Disaster Prevention

Principal Investigator

Saito Tatsuhiko  国立研究開発法人防災科学技術研究所, 地震津波防災研究部門, 主任研究員 (30550933)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords地震 / 津波 / 歪みエネルギー / 断層破壊 / 巨大地震 / 歪み蓄積
Outline of Research at the Start

海底下地殻への歪み蓄積―断層破壊―津波発生の各物理過程を統合した定量モデリングによって,大津波がどこで,どのように発生するか予測する.地殻変動データの解析から,プレート間固着とそれが引き起こす地殻内への歪み蓄積を推定し,どこで大地震が起こり得るかを予測する.次に,その地震によって,どのように津波が励起するかを予測する.連動破壊によって巨大化する地震,地震波を放射せずに大津波を励起する津波地震など,様々な断層破壊プロセスを想定する.固液複合波動場シミュレーションによって,固体地殻-流体海水系における津波発生プロセスの全容を明らかにする.

Outline of Final Research Achievements

This study investigates tsunami generation based on the tsunami theory including earthquake generation mechanism to assess where and how large tsunamis possibly occur in the future off the Pacific coast of Japan. In order to identify mechanically locked areas along the plate interface as tsunami source, we developed a method to analyze crustal deformation and applied it to the Nankai trough subduction zone. Furthermore, using a theory of energy balance associated with earthquake fault motions, we simulated the earthquake rupture and tsunami propagation. This study developed a method to create earthquake and tsunami scenarios that may occur in the future based on mechanics and observed data.

Academic Significance and Societal Importance of the Research Achievements

過去の大地震が将来も繰り返して起こるとことを前提にする現在主流の地震発生の長期予測手法は,過去に発生事例が知られていない大地震の発生を想定することが難しい.本研究では,GPSなどの衛星測位技術を使うことで列島の変形を計測し,プレート境界に加わっている力を推定し,その力を原動力として巨大地震の断層破壊をシミュレートする手法の研究開発を行った.本研究によって,断層物理学と観測データをから将来起こりうる巨大地震とその津波を想定するフレームワークを実際に提示することができた.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2021 2020 2019

All Journal Article (9 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 9 results,  Open Access: 7 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Earthquake Rupture and Tsunami Generation of the 2015 Mw 5.9 Bonin Event Revealed by In Situ Pressure Gauge Array Observations and Integrated Seismic and Tsunami Wave Simulation2021

    • Author(s)
      Kubota Tatsuya、Saito Tatsuhiko、Fukao Yoshio、Sugioka Hiroko、Ito Aki、Tonegawa Takashi、Shiobara Hajime、Yamashita Mikiya
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 22

    • DOI

      10.1029/2021gl095915

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Meteotsunami Observed by the Deep‐Ocean Seafloor Pressure Gauge Network Off Northeastern Japan2021

    • Author(s)
      Kubota Tatsuya、Saito Tatsuhiko、Chikasada Naotaka Y.、Sandanbata Osamu
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 21

    • DOI

      10.1029/2021gl094255

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detection of “Rapid” Aseismic Slip at the Izu‐Bonin Trench2021

    • Author(s)
      Fukao Yoshio、Kubota Tatsuya、Sugioka Hiroko、Ito Aki、Tonegawa Takashi、Shiobara Hajime、Yamashita Mikiya、Saito Tatsuhiko
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 126 Issue: 9

    • DOI

      10.1029/2021jb022132

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impulsive Tsunami and Large Runup Along the Sanriku Coast of Japan Produced by an Inelastic Wedge Deformation Model2021

    • Author(s)
      Du Yue、Ma Shuo、Kubota Tatsuya、Saito Tatsuhiko
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 126 Issue: 8

    • DOI

      10.1029/2021jb022098

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Meteorological tsunami generation due to sea-surface pressure change: Three-dimensional theory and synthetics of ocean-bottom pressure change2021

    • Author(s)
      Saito, T., Kubota, T., Chikasada N. Y, Tanaka, Y., & Sandanbata, O.
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 126 Issue: 5

    • DOI

      10.1029/2020jc017011

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Extracting near-field seismograms from ocean-bottom pressure gauge inside the focal area: application to the 2011 Mw 9.1 Tohoku-Oki earthquake2021

    • Author(s)
      Kubota, T., Saito, T., Tsushima, H., Hino, R., Ohta, Y., Suzuki S, & Inazu D.
    • Journal Title

      Geophysical Research Letters

      Volume: 48 Issue: 7

    • DOI

      10.1029/2020gl091664

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Strain energy released by earthquake faulting with random slip components2020

    • Author(s)
      Tatsuhiko Saito, Akemi Noda
    • Journal Title

      Geophysical Journal International

      Volume: 220 Issue: 3 Pages: 2009-2020

    • DOI

      10.1093/gji/ggz561

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tsunami Modeling for the Deep Sea and Inside Focal Areas2019

    • Author(s)
      Saito, T., T. Kubota
    • Journal Title

      Annual Review of Earth and Planetary Sciences

      Volume: 48 Issue: 1 Pages: 121-145

    • DOI

      10.1146/annurev-earth-071719-054845

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Synthesizing sea surface height change including seismic waves and tsunami using a dynamic rupture scenario of anticipated Nankai trough earthquakes2019

    • Author(s)
      Tatsuhiko Saito, Toshitaka Baba, Daisuke Inazu, Shunsuke Takemura, Eiichi Fukuyama
    • Journal Title

      Tectonophysics

      Volume: 769 Pages: 228166-228166

    • DOI

      10.1016/j.tecto.2019.228166

    • NAID

      120007042448

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 歪みエネルギー評価による地震発生メカニズムの理解2021

    • Author(s)
      齊藤竜彦
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] A three-dimensional theory for meteorological tsunami generation and propagation2021

    • Author(s)
      Saito, T., T. Kubota, N.Y. Chikasada, Y. Tanaka, O. Sandanbata
    • Organizer
      30th International Tsunami Symposium
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 南海トラフの力学的固着:プレート境界地震の連 鎖的な発生と余効すべり2021

    • Author(s)
      齊藤竜彦・野田朱美
    • Organizer
      日本地震学会2021年度秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Tsunami synthetics using mechanic-based earthquake rupture scenarios2020

    • Author(s)
      Tatsuhiko Saito, Akemi Noda
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Strain energy released by an earthquake with random slip fluctuations: a stochastic model2019

    • Author(s)
      Tatsuhiko Saito, Akemi Noda
    • Organizer
      27th IUGG General Assembly
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Strain energy release by an earthquake rupture with heterogeneous stress-drop distribution2019

    • Author(s)
      Tatsuhiko Saito, Akimi Noda
    • Organizer
      AGU Fall meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] '弾性・粘弾性媒質における地震による歪みエネルギー変化の可視化と定量化:波数積分法による計算2019

    • Author(s)
      齊藤竜彦,野田朱美
    • Organizer
      日本地震学会秋季大会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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