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Geological survey of past tsunamis in the earastern margin of the Japan Sea regarding subduction-zone earthquakes

Research Project

Project/Area Number 25870062
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Natural disaster / Disaster prevention science
Geology
Research InstitutionTohoku University

Principal Investigator

SUGAWARA Daisuke  東北大学, 災害科学国際研究所, 助教 (50436078)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords日本海東縁 / 地震 / 津波 / 堆積物 / 津波堆積物 / 日本海 / 数値シミュレーション
Outline of Final Research Achievements

Tsunami traces in the eastern margin of the Japan Sea was investigated and sandy event layers were discovered from the coastal areas of Yamagata Prefecture. Depositional ages of each layer are 11th and 8-9th century, respectively. The sand layers contain brackish diatoms, implying sediment supply from tidal zones through the rivers. Results of numerical modeling of tsunami generation and propagation showed that earthquake tsunami in the offshore of Yamagata is at most 5 m and cannot explain the sandy event layers. A submarine slope failure, which was identified from bathymetry and bottom profiling data, generates a large-scale tsunami with the height of 20 m near the coastline. The tsunami reaches the survey sites and can explain the possible sandy tsunami deposits. In conclusion, this study demonstrated the possibility of occurrence of a large-scale tsunami during 150-200 years after the 869 Jogan earthquake.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (4 results)

All 2014 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results)

  • [Journal Article] Extracting Magnitude Information from Tsunami Deposits2014

    • Author(s)
      菅原大助
    • Journal Title

      Journal of Geography (Chigaku Zasshi)

      Volume: 123 Issue: 6 Pages: 797-812

    • DOI

      10.5026/jgeography.123.797

    • NAID

      130004813833

    • ISSN
      0022-135X, 1884-0884
    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Presentation] 1833年天保出羽沖地震津波の波源再評価2014

    • Author(s)
      今井 健太郎・都司 嘉宣・菅原大助
    • Organizer
      2014年日本地震学会秋季大会
    • Place of Presentation
      朱鷺メッセ新潟コンベンションセンター(新潟市)
    • Year and Date
      2014-11-25
    • Related Report
      2014 Annual Research Report
  • [Presentation] 海溝型地震の予後:津波痕跡による変動の評価2014

    • Author(s)
      箕浦幸治・菅原大助・山野井徹・山田 努
    • Organizer
      2014年日本地質学会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2014-09-15
    • Related Report
      2014 Annual Research Report
  • [Presentation] 堆積粒子の巻き上げに伴うエネルギー散逸を考慮した津波土砂移動の計算と検証

    • Author(s)
      菅原大助・成瀬 元・後藤和久
    • Organizer
      日本堆積学会 2014年山口大会
    • Place of Presentation
      山口大学吉田キャンパス
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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