Geological archives of paleontological, sedimentological, and geochemical analyses for tsunami deposits

• Project/Area Number: 15K05334
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Sawai Yuki 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 上級主任研究員 (20399504)
• Co-Investigator(Kenkyū-buntansha): 谷川 晃一朗 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (30613541) ; 松本 弾 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 研究員 (80709551)
• Research Collaborator: NAMEGAYA Yuichi 産業技術総合研究所, 活断層・火山研究部門, 主任研究員 ; IOKI Kei 産業技術総合研究所, 活断層・火山研究部門, 研究員 ; NAKAMURA Atsunori 産業技術総合研究所, 地質情報研究部門, 研究員 ; SHINOZAKI Tetsuya 筑波大学, アイソトープ環境動態研究センター, 特任助教 ; Pilarczyk Jessica 南ミシシッピ大学, 助教
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 津波堆積物 / 粒度分析 / 地球化学分析 / 微化石分析 / 化学分析

Outline of Final Research Achievements

The purpose of this study is to provide geological archives of paleontological, sedimentological, and geochemical analyses for modern tsunami deposits, such as tsunami deposits generated with the 2011 Tohoku earthquake. Tsunami deposits for the analyses were taken in eastern Hokkaido, Sendai plain, Minami Soma City (Fukushima Prefecture), Hasunuma coast (Chiba Prefecture). As the results of the analyses, we revealed vertical changes in grain size and geochemical components (e.g., biomarkers, and water-leachable ions) and lateral changes in grain size and thickness of the deposits. Changes in diatoms and foraminifera assemblages within tsunami deposits probably represent process of erosion, transporting, and redepositing sediments during the tsunami inundation.

Research Products

• [Journal Article] Tsunami deposit associated with the 2011 Tohoku-oki tsunami in the Hasunuma site of the Kujukuri coastal plain, Japan. (2016)
  • Author(s): Matsumoto, D., Sawai, Y., Tanigawa, K., Fujiwara, O., Namegaya, Y., Shishikura, M., Kagohara, K., Kimura, H.
  • Journal Title: Island Arc Volume: 25 Issue: 5 Pages: 369-385
  • DOI: 10.1111/iar.12161
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Geochemical characteristics of deposits from the 2011 Tohoku-oki tsunami at Hasunuma, Kujukuri coastal plain (2016)
  • Author(s): Shinozaki T., Sawai Y., Hara J., Ikehara M., Matsumoto D., Tanigawa K.
  • Journal Title: Island Arc Volume: 25 Issue: 5 Pages: 350-368
  • DOI: 10.1111/iar.12159
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Using meteoric Be-10 to identify sources of tsunami deposits (2017)
  • Author(s): Atsunori Nakamura、Yuki Sawai、Junko Hara、Dan Matsumoto、Hiroyuki Matsuzaki、Tetsuya Shinozaki、Koichiro Tanigawa
  • Organizer: AGU Fall Meeting 2017
  • Int'l Joint Research
• [Presentation] 千葉県蓮沼海岸で観察された2011年東北地方太平洋沖地震の津波堆積物 (2016)
  • Author(s): 澤井祐紀・松本弾・谷川晃一朗・藤原治・行谷佑一・宍倉正展・楮原京子・木村治夫
  • Organizer: 日本第四紀学会
  • Place of Presentation: 千葉大学（千葉市）
  • Year and Date: 2016-09-17