JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Poster

H (Human Geosciences) » H-QR Quaternary research

[H-QR05] [JJ] Diachronic dynamics of human-environment interactions

Thu. May 25, 2017 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Toshihiko Sugai(Department of Natural Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo), Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Kiyohide Mizuno(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology), Minoru YONEDA(The University Museum, The University of Tokyo)

[HQR05-P08] Environmental History during the last 2,000 years in Lake Hamana, Shizuoka

*Kazuyoshi Yamada1, Koji Seto2, Kota Katsuki2, Takumi Sato2 (1.Museum of Natural and Environmental history, Shizuoka, 2.Shimane University)

Keywords:Sedimentary Environment, Lake Hamana

Lake Hamana is seventh biggest lakes in Japan, locates on the coastline of the Pacific Ocean. Archaeological data suggests that people lived around the lake from Jomon periods, and brackish environment in the lake that is modern condition might be caused by tsunami event related to huge earthquake along the Nankai Trough in 1498 AD.
In order to reconstruct the variation of the past environment during the last 2,000 years, TOC, TN, TS contents with multiple radiocarbon data are measured with high-resolution.
The bottomed sediments were obtained at northern flat basin which is approximately 11 m in water depth in the lake. Two sediments cores which are 378 and 132 cm length, respectively have continues deposition since the 2,100 cal yr BP on the basis of radiocarbon data.
Our preliminary results of variations of TOC, TN, TS contents indicates brackish to marine environments last for the 2,000 years, and there is no signal against tsunami event in 1498 AD.