*Kenta TAKAGI¹, Takayuki INOUE², Seigo OOKI², Takeshi OHBA² (1.Course of Chemistry, Graduate School of Science, Tokai University, 2.Course of Chemistry, School of Science, Tokai University)

*Shiho YABUSAKI¹ (1.Faculty of Symbiotic Systems Science, Fukushima University)

*Takashi NAKAMURA¹, Kei NISHIDA¹, Futaba KAZAMA¹ (1.ICRE, University of Yamanashi)

*Kazuyoshi ASAI¹, Maki TSUJIMURA² (1.Geo-science laboratory, 2.University of Tsukuba)

*Noritoshi MORIKAWA¹, Masaya YASUHARA¹, Atsuko NAKAMA¹, Akihiko INAMURA¹, Masaaki TAKAHASHI¹ (1.Geological Survey of Japan, AIST)

*Nariaki NISHIYAMA¹, Kazuhiro TANAKA¹, Koichi SUZUKI² (1.Yamaguchi University, 2.Central Research Institute of Electric Power Industry)

*Hiroshi TAKAHASHI¹, Hiroko HANDA¹, Masayo MINAMI², Takafumi ARAMAKI³, Toshio NAKAMURA² (1.Geological Survey of Japan, AIST, 2.Center for Chronological Research, Nagoya University, 3.National Institute for Environmental Studies)