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Source process of great historical tsunamis estimated by nonlinear inversion using historical and geological data

Research Project

Project/Area Number 15K21682
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Natural disaster / Disaster prevention science
Solid earth and planetary physics
Research InstitutionThe University of Tokushima

Principal Investigator

BABA Toshitaka  徳島大学, 大学院社会産業理工学研究部(理工学域), 教授 (90359191)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords津波 / 海溝型地震 / 海底地すべり / 南海トラフ / 歴史地震 / 震源過程 / 非地震性津波 / 歴史津波 / 津波波源 / 逆解析 / 波源 / すべり分布 / 2003年十勝沖地震
Outline of Final Research Achievements

The study estimated slip distributions of the historical interplate earthquakes along the Nankai trough using a grid-search algorithm. A pre-computed tsunami database including about 4000 scenarios was compared with observed tsunami heights to find appropriate slip distributions for the 1854 Ansei, 1707 Hoei and 1605 Keicho earthquakes. Non-earthquake-generated tsunami caused by a submarine land slide was also investigated by multi-narrow echo sounder survey and numerical tsunami simulations. The results predicted the maximum tsunami height of about 10 m from the submarine landslide near Shikoku.

Academic Significance and Societal Importance of the Research Achievements

南海トラフ地震のような海溝型巨大地震は一定間隔を経て繰り返し発生する.繰り返す地震の破壊様式は似ているものの,全く同じ破壊というわけではないようである.このため,将来の南海トラフ地震の破壊様式を予測するためには,まずは過去の地震がどのような破壊様式であったのかを知る必要がある.本研究ではこれについて調査した.また,津波は地震によって発生することが多いが,海底地すべりでも発生する.海底地すべり津波は地震性津波と比べて地震動が弱いため,「揺れたら高台へ逃げろ」が通用しない.2018年にはインドネシアで海底地すべりと山体崩壊による津波が発生した.日本においても海底地すべり津波の研究が求められている.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (17 results)

All 2018 2017 2016 Other

All Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results) Presentation (11 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results) Remarks (3 results)

  • [Journal Article] Accurate numerical simulation of the far-field tsunami caused by the 2011 Tohoku earthquake, including the effects of Boussinesq dispersion, seawater density stratification, elastic loading, and gravitational potential change2017

    • Author(s)
      Baba, T., S. Allgeyer, J. Hossen, P.R. Cummins, H. Tsushima, K. Imai, K. Yamashita, and T. Kato
    • Journal Title

      Ocean Modelling

      Volume: 111 Pages: 46-54

    • DOI

      10.1016/j.ocemod.2017.01.002

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 新地球シミュレータによる高分解能・量的津波シミュレーョン2016

    • Author(s)
      今任嘉幸,石橋正信,馬場俊孝,安藤和人,上原均,加藤季広
    • Journal Title

      情報処理学会論文誌:ハイパフォーマンスコンピューティングと計算科学シンポジウム論文集

      Volume: - Pages: 1-8

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of semi-real-time tsunami monitoring and calculation system on ocean-bottom stations off the Kii peninsula, southwest Japan2016

    • Author(s)
      Nakamura, T. and T. Baba
    • Journal Title

      Marine Tech. Soc. J.

      Volume: 50 Issue: 3 Pages: 76-86

    • DOI

      10.4031/mtsj.50.3.11

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 徳島県宍喰沖海底地すべり痕のマルチナロービーム測深2018

    • Author(s)
      馬場俊孝・権容大・松野哲男・林美鶴・市原寛
    • Organizer
      第35回歴史地震研究会(大分大会)
    • Related Report
      2018 Annual Research Report
  • [Presentation] Numerical Modeling of Submarine Landslide Tsunami Assuming a Source on the Continental Slope in the Nankai Trough, Japan2018

    • Author(s)
      Toshitaka Baba, Kentaro Imai, Kei Yamashita, Tetsuo Matsuno, Mitsuru Hayashi, Hiroshi Ichihara
    • Organizer
      10th ACES international Workshop
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 四国沖大陸棚斜面の海底地すべりの地形調査2018

    • Author(s)
      権容大・馬場俊孝・松野哲男・林美鶴・市原寛
    • Organizer
      日本地震学会2018年度秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 徳島県宍喰沖の海底地すべりを波源とした津波計算2018

    • Author(s)
      馬場俊孝・今井健太郎・山下啓・松野哲男
    • Organizer
      第8回巨大津波災害に関する合同研究集会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 津波伝播コードJAGURSによる遠地津波と海底地すべりによる津波の解析2018

    • Author(s)
      馬場俊孝
    • Organizer
      国際津波防災学会津波シミュレーション分科会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 分散性を考慮した2011年東北地方太平洋沖地震津波のシミュレーション2017

    • Author(s)
      馬場俊孝
    • Organizer
      第10回海事防災研究会
    • Place of Presentation
      神戸大学(兵庫県神戸市)
    • Year and Date
      2017-03-09
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] 平面二次元モデルによる津波の伝播・変形・遡上2017

    • Author(s)
      馬場俊孝
    • Organizer
      第26回海洋工学シンポジウム
    • Place of Presentation
      日本大学理工学部(東京都千代田区)
    • Year and Date
      2017-03-06
    • Related Report
      2016 Research-status Report
  • [Presentation] Paleographical, bathymetric and numerical investigations for a tsunami possibly caused by submarine mass failures in the Nankai trough, Japan2017

    • Author(s)
      Baba, T., J. Ashi, T. Kanamatsu, K. Imai, K. Yamashita
    • Organizer
      AGU fall meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] A possible tsunami caused by a submarine landslide in 1512 at the Nankai trough, Japan2017

    • Author(s)
      Baba, T., T. Okada, J. Ashi, T. Kanamatsu
    • Organizer
      IAG-IASPEI 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] A possible source model of the 1512 Eisho tsunami described in an ancient document2017

    • Author(s)
      Baba, T., T. Okada, J. Ashi, T. Kanamatsu
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 津波被害軽減のためのグローカル津波予測2017

    • Author(s)
      馬場俊孝
    • Organizer
      第21回AEコンファレンス
    • Related Report
      2017 Research-status Report
    • Invited
  • [Remarks] Toshitaka Baba's Home page,研究内容

    • URL

      http://toshitaka-baba.wixsite.com/index/reserch-theme

    • Related Report
      2017 Research-status Report
  • [Remarks] Toshitaka Baba's Home Page, 研究内容

    • URL

      http://toshitaka-baba.wixsite.com/index/reserch-theme

    • Related Report
      2016 Research-status Report
  • [Remarks] Toshitaka Baba's Home Page, 南海トラフ沈み込み帯

    • URL

      http://toshitaka-baba.wix.com/index#!nankai-subdcution-zone/c156g

    • Related Report
      2015 Research-status Report

URL: 

Published: 2015-04-16   Modified: 2020-03-30  

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