Japan Geoscience Union Meeting 2015

Presentation information

Poster

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

[M-IS33] Progress in marine geoscience off Pacific coast of Tohoku after the 2011 earthquake and tsunami

Tue. May 26, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Kazuko Usami(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology), Ken Ikehara(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology), Yoshihiro Ito(Disaster Prevention Research Institute, Kyoto University), Takashi Toyofuku(Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

6:15 PM - 7:30 PM

[MIS33-P08] A secular variation of sub-bottom environment after the 3.11 Tohoku Earthquake and Tsunami disaster around Hirota-Bay

*Takuya ARAKAWA1, Izumi SAKAMOTO1, Yuka YOKOYAMA1, Masatoshi YAGI1, Satsuki IIJIMA1, Tomohito INOUE1, Kenji NEMOTO1, Mikio FUJIMAKI2 (1.School of marine science and technology, Tokai university, 2.Costal Ocean Resech)

Keywords:Tsunami, Sediment, Environmennt

On March 11, 2011, Tohoku Earthquake and Tsunami disaster were generated and the Tohoku district Pacific side suffered serious damage over a wide area. It intends that I clarify a change of sub-bottom environment and I predict it in the future at Hirota bay.
The sample which was gathered near the front of Kesen River in September, 2013 change from the gravel sediment to the mud sediment. As for this change, the influence of the typhoon and the heavy rain are thought about. The sediment from the mouth of Kesen River will be changed by the weather condition.
The strong reflector of SSS data which is distributed over the front of Kesen River is a tendency to decrease from 2013 through 2014. On the other hand, outer layer sediments which is distributed over the front of Kesen River change from the fine sediment to the corse sediment. And, a distribution range of the mud sediment spreads out in the east side of the Osabe fishing port. Thus, it is thought that the mud is carried to the offshore and the bay central part such as river water. Sub-bottom environment of the center part from Hirota bay will change to the mud sediment in the future.