*Hiroki Kise¹, AKIRA IGUCHI^1,2, TAKUJI IKEGAMI³, YOSUKE ONISHI³, KOICHI GOTO³, YUICHIRO TANAKA¹, TRAVIS W. WASHBURN¹, MIYUKI NISHIJIMA¹, TAIGA KUNISHIMA^1,4, SHOGO KATO⁵, TAKAAKI MATSUI⁶, NOBUYUKI OKAMOTO⁷, ATSUSHI SUZUKI^1,2 (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 2.Research Laboratory on Environmentally-conscious Developments and Technologies [E-code], National Institute of Advanced Industrial Science and Technology (AIST), 3.KANSO CO., LTD, 4.Wakayama Prefectural Museum of Natural History, 5.IDEA Consultants, Inc., 6.Marine Biological Research Institute of Japan CO., LTD, 7.Japan Oil, Gas and Metals National Corporation (JOGMEC))