Japan Geoscience Union Meeting 2016

Presentation information


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

[M-IS11] tsunami deposit

Thu. May 26, 2016 9:00 AM - 10:30 AM IC (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)

9:00 AM - 9:15 AM

[MIS11-01] High-precision age estimation of tsunami deposits in Koyadori, Yamada Town, northeast Japan

*Daisuke Ishimura1 (1.Disaster Science Division, International Research Institute of Disaster Science, Tohoku University)

Keywords:tsunami deposits, radiocarbon dating, 210Pb, 137Cs, Sanriku Coast

Radiocarbon dating is generally conducted for age estimation of tsunami deposits. Moreover, other dating methods were applied depending on sediments and regions (Sawai, 2012). However, we need to consider and assess accuracy of measured dates because contamination and disturbance affect accuracy and precision of them. In this study, we conducted radiocarbon dating using some kinds of materials for precise age estimation of tsunami deposits and discussed about appropriate samples for age estimation. Moreover, we measured excess 210Pb and 137Cs for age estimation of very young sediments. From these data, we obtained more accurate and precise age model for tsunami deposits at Koyadori than previous study (Ishimura and Miyauchi, 2015).