*IKEUCHI ERI¹, Akira Igichi¹, Hiroyuki Yokooka², Hideki Sugishima², Kazumasa Ikeda³, Ryuichi Miwa⁴, Miyuki Nishijima¹, Nozomu Iwasaki⁵, Yuichiro Tanaka¹, Taiga Kunishima^1,6, Shogo Kato⁷, Junpei Minatoya⁷, Yoshiaki Igarashi⁷, Nobuyuki Okamoto⁷, Atsushi Suzuki¹ (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.IDEA Consultants, Inc., 3.Okamoto Glass Co., Ltd., 4.Kaiyo Engineering Co., Ltd., 5.Faculty of Geo-Environmental Science, Rissho University, 6.Wakayama Prefectural Museum of Natural History, 7.Japan Oil, Gas and Metals National Corporation)

*Kyoko Yamaoka¹, Atsushi Suzuki¹, Yuki Ota¹, Yuichiro Tanaka¹, Akifumi Shimamoto², Tatsuo Fukuhara², Junpei Minatoya³, Shogo Kato³, Yoshiaki Igarashi³, Nobuyuki Okamoto³ (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.KANSO Co.,Ltd., 3.Japan Oil, Gas and Metals National Corporation (JOGMEC))