[MIS09-P05] On the secular change of the bottom sediment after the 2011 Tohoku-oki tsunami in Onagawa Bay
Keywords:Tsunami deposit, Onagawa Bay
In this research, as a result of the bottom sediment survey of Onagawa Bay after the 2011 Tohoku-oki tsunami, it was found that the sediment was changed from sandy to muddy environment by the effect of the tsunami.
The bottom sediment distribution map was prepared from the data of the sediment survey conducted by Tohoku University (data from 2013).
As a result, it seemed that the proportion of mud content is low. The secular change of bottom material after the 2011 Tohoku-oki tsunami in Onagawa Bay, is thought that the proportion of mud decreases over time and it is changing to sandy material.