Japan Geoscience Union Meeting 2021

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS15] Tsunami deposit: research progress after the 2011 Tohoku-oki earthquake and prospects

Sun. Jun 6, 2021 3:30 PM - 5:00 PM Ch.17 (Zoom Room 17)

convener:Masaki Yamada(Department of Geology, Faculty of Science, Shinshu University), Takashi Ishizawa(International Research Institute of Disaster Science, Tohoku University), Masashi Watanabe(Chuo University), Koichiro Tanigawa(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Chairperson:Masashi Watanabe(Chuo University), Koichiro Tanigawa(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

4:15 PM - 4:30 PM

[MIS15-06] Event deposits in Lake Jusan, western part of Aomori Prefecture, NE Japan

*Fumika Hirano1, Atsushi Urabe2 (1.Faculty of Science, Niigata University, 2.Research Institute for Natural Hazards and Disaster Recovery, Niigata University)

Keywords:Japan Sea, tsunami deposit, Lake Jusan

In this study, the first boring survey was conducted in the central part of the Lake Jusan, a lagoon along the coast of the Japan Sea to analyze tsunami records on the coast of the Japan Sea in NE Japan. As a result of this survey, nine layers of tsunami deposits caused by the offshore tsunami were identified, and their ages were estimated.
The transport process was restored for tsunami deposits formed by tsunamis that entered the coastal lacustrine that are different from tsunami deposits that run up to land. Additionally, the formative process of the tsunami deposits in lacustrine was clarified by observing composition of particles and their roundness. The characteristics of the constituent particle indicated that tsunami deposits of the JSK-1 core were transported by backwash in a lacustrine environment. The results of this research contribute to the elucidation of tsunami records in the Japan Sea region and the analysis of the source faults distributed offshore of NE Japan.