5:15 PM - 6:30 PM
*takuya saito1, Masanori Tamura2, Tsutomu Soda3, Shuichi Hashimoto2, Yuji Torigoe2, Yoko Hirakura1, Hironari Yanagisawa1, Yasuo Ichikawa1 (1.Oyo Corporation, 2.Tohoku Electric Power Co.,Inc., 3.Institute of tephrochronology for Nature and History Co., Ltd)