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Research on evaluation methods for tsunamis due to ocean bottom landslides caused by great underthrust earthquakes

Research Project

Project/Area Number 19H01977
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17030:Human geosciences-related
Research InstitutionHokkaido University

Principal Investigator

Tanioka Yuichiro  北海道大学, 理学研究院, 教授 (40354526)

Co-Investigator(Kenkyū-buntansha) 今井 健太郎  国立研究開発法人海洋研究開発機構, 海域地震火山部門(地震津波予測研究開発センター), グループリーダー代理 (20554497)
富士原 敏也  国立研究開発法人海洋研究開発機構, 海域地震火山部門(地震発生帯研究センター), 主任研究員 (30359129)
中村 恭之  国立研究開発法人海洋研究開発機構, 海域地震火山部門(地震発生帯研究センター), グループリーダー (60345056)
柳澤 英明  東北学院大学, 教養学部, 准教授 (70635995)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywords海底地すべり津波 / 数値計算手法開発 / 海底地すべり津波評価手法 / 1928年グレートバンクス津波 / 1046年アリューシャン津波 / 地すべり津波数値計算 / 1946年アリューシャン津波 / 南海トラフ海底地すべり / 1929年Grand Banks 津波 / 海溝型巨大地震 / 津波数値計算手法 / 南海トラフ海底地すべり痕跡 / 1929年Brand Banks津波 / 日本海溝沿い / 南海トラフ
Outline of Research at the Start

海溝沿いで巨大地震が発生した場合、地震による地殻変動で励起される大津波だけでなく、海溝近傍の斜面で発生する地すべりにより津波が励起される場合がある。そこで、本研究では深海での海底地すべりから津波を計算するための津波・地すべり数値計算手法を開発する。また、南海トラフや日本海溝・千島海溝沿いの海底地すべり地形を判別し、その形状と規模を推定する。想定巨大地震の断層運動による津波とその地すべりによる津波を開発した津波・地すべり数値計算手法を用いて計算し、沿岸での津波評価手法を確立する。

Outline of Final Research Achievements

The tsunami numerical calculation method was developed to calculate both submarine landslides and tsunamis. Numerical experiments were conducted to reproduce the 1928 Grand Banks submarine landslide and its tsunami. The submarine cable disconnection due to the submarine landslide and the observed tsunami waveform due were well explained by computed ones. Next, we conducted a tsunami simulation for the 1946 Aleutian Tsunami Earthquake. It was found that the computed tsunami from the submarine landslide and fault model explained the tsunami observed run-up height near the source area. In order to develop an evaluation method for submarine landslide tsunamis along the Nankai Trough, we identified 37 submarine landslide scars and 50 cliff collapses that could produce significant tsunami heights. The abnormally high tsunami at Atashika-cho, Mie Prefecture during the 1944 Showa Tonankai Earthquake was well explained by assuming that an offshore landslide occurred.

Academic Significance and Societal Importance of the Research Achievements

深海での海底地すべりによる津波励起が最も明らかな1928年グランドバンクスの津波の再現実験に成功したことは、深海での海底地すべりによる津波の数値計算モデルが開発できたことを示し、学術的意義が高い。さらに、世界最大の津波地震と言われる1946年アリューシャン津波地震の津波遡上高を再現できたことも学術的意義が高い。南海トラフ沿いの海底地すべり痕を評価することで海底地すべりの津波が評価できることを示した事は、今まで事前評価が出来ていなかった海底地すべり津波の評価手法を示したもので社会的意義が非常に高い。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (15 results)

All 2022 2021 2020 2019

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (13 results) (of which Int'l Joint Research: 10 results,  Invited: 2 results)

  • [Journal Article] Numerical Simulations Using Various Models for Tsunamis Due to a Fluid or Rigid Bodies Falling Down a Uniform Slope2021

    • Author(s)
      Kakinuma T, Yanagihara M, Iribe T, Nagai K, Hara C, Hamada N, Nakagaki Tatsuya、Sujatmiko K A, Magdalena I, Nagai K, Kannonji R, Chen S, Shirai T, Arikawa Taro,
    • Journal Title

      Journal of Disaster Research

      Volume: 16 Issue: 7 Pages: 994-1004

    • DOI

      10.20965/jdr.2021.p0994

    • NAID

      130008098158

    • ISSN
      1881-2473, 1883-8030
    • Year and Date
      2021-10-01
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Modeling of a dispersive tsunami caused by a submarine landslide based on detailed bathymetry of the continental slope in the Nankai trough, southwest Japan2019

    • Author(s)
      Baba Toshitaka、Gon Yodai、Imai Kentaro、Yamashita Kei、Matsuno Tetsuo、Hayashi Mitsuru、Ichihara Hiroshi
    • Journal Title

      Tectonophysics

      Volume: 768 Pages: 228182-228182

    • DOI

      10.1016/j.tecto.2019.228182

    • NAID

      120007141577

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 昭和東南海地震における新鹿の津波痕跡高の励起源について2022

    • Author(s)
      今井健太郎・大林涼子・中村恭之・谷岡勇市郎
    • Organizer
      2022年度地震学会秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 南海トラフ沖の海底地すべりによる津波の影響に関する検討2022

    • Author(s)
      今井 健太郎・大林 涼子・中村 恭之・富士原 敏也・柳澤 英明・谷岡 勇市郎
    • Organizer
      第69回土木学会海岸工学講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Did a submarine landslide contribute to the 1996 Biak, Indonesia tsunami?2022

    • Author(s)
      S.H.Pandadaran, H.Yanagisawa, B.Shibazaki, Y.Fujii, T.Miyagi
    • Organizer
      AGU Fall Meeting 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of Real-time Estimation Method for Anak Krakatau Volcanic-induced Tsunamis, Indonesia2022

    • Author(s)
      Rinda Nita Ratnasari, Yuichiro Tanioka, Yusuke Yamanaka
    • Organizer
      AOGS 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 1929年Grandbanks海底地すべり津波の波形解析2021

    • Author(s)
      中垣達也・谷岡勇市郎
    • Organizer
      JpGU-AGU Joint Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Tsunami modeling by marine landslides and reduction of disasters2021

    • Author(s)
      Tanioka, Y.
    • Organizer
      Geohazard Symposium, Science Council of Japan
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Numerical Simulation of the 1929 Grand Banks Submarine Landslide Tsunami2021

    • Author(s)
      Nakagaki, T, and Y. Tanioka
    • Organizer
      30th International Tsunami Symposium
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 南海トラフ沿いで発生する海底地すべりによる津波励起の特徴に関する予察2021

    • Author(s)
      今井 健太郎、中村 恭之、富士原 敏也、谷岡 勇市郎
    • Organizer
      日本地震学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Tsunami modeling by marine landslides and reduction of disasters2020

    • Author(s)
      Tanioka, Y., H. Yanagisawa, K. Ioki, T. Nakagaki
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Numerical Simulation of Submarine Landslide Tsunami due to the 1929 Grand Banks Earthquake2020

    • Author(s)
      Nakagaki, T., Y. Tanioka
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical Simulation of Submarine Landslide Tsunami due to the 1929 Grand Banks Earthquake2020

    • Author(s)
      Tanioka, Y, R. Ratnasari
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seafloor Displacement along the Japan Trench Caused by the 2011 Tohoku-Oki Earthquake Examined by Repeated Bathymetric Surveys2020

    • Author(s)
      Fujiwara, T., S. Kodaira, G. Fujie, Y. Kaiho, T. Kanamatsu, T. Kasaya, Y. Nakamura, T. No, T. Sato, T. Takahashi, N. Takahashi, Y. Kaneda, A.K. Bachmann, C. dos Santos Ferreira, G. Wefer, M. Strasser, T. Sun
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical simulation of debris avalanche and tsunami caused by the 2018 sector collapse of Anak Krakatau2020

    • Author(s)
      Yanagisawa, H., T. Yatimantoro
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research

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

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