Event deposits discovered on the mouth area of Arakawa River, Niigata, Japan

Yasuhiro TAKASHIMIZU; Katsunori ONO; Atsushi URABE; Shunsuke TSURUMAKI

Presentation information

Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS25] tsunami deposit

Sun. May 24, 2015 9:00 AM - 10:45 AM 201B (2F)

Convener:*Kazuhisa Goto(International Research Institute of Disaster Science (IRIDeS),Tohoku University), Masanobu Shishikura(Institute of Earthquake and Volcano Geology, National Institute of Advanced Industrial Science and Technology), Yuichi Nishimura(Graduate School of Science, Hokkaido University), Chair:Kazuhisa Goto(International Research Institute of Disaster Science (IRIDeS),Tohoku University), Yasuhiro Takashimizu(Mathematical and Natural Sciences, Institute of Humanities, Social Sciences and Education, Niigata University)

10:00 AM - 10:15 AM

[MIS25-05] Event deposits discovered on the mouth area of Arakawa River, Niigata, Japan

*Yasuhiro TAKASHIMIZU¹, Katsunori ONO¹, Atsushi URABE¹, Shunsuke TSURUMAKI¹ (1.Niigata University)

Keywords:Tsunami deposits

A characteristic sandy layer probably resulting from past tsunami event was discovered on the mouth area of Arakawa River, Niigata, Japan. The event layer shows following features. The deposit is 1) distributed at least approximately 1 km from the coast; 2) shows a fining- and thinning- landward trend, 3) indicates increasingly poor sorting landward, and 4) includes mud clasts eroded from the muddy layer below the event deposits.