*Takeshi Oi¹, Mikio Satoh², Ryo Matsumoto¹ (1.Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University, 2.Insititute for Geo-Resource and Environment, Natural Institute of Advanced Industrial Science and Technology)

*Hiroyuki Ochiai¹, Takeshi Oi² (1.The Kitasato Institute Kitasato University, 2.Meiji Unicersity)

*Atsushi Tani¹, Kyohei Yamada¹, Hitoshi Tomaru², Takeshi Oi³, Ryo Matsumoto³ (1.Graduate School of Science, Osaka University, 2.Graduate School of Science, Chiba University, 3.Gas Hydrate Laboratory, Meiji University)

*Mikio Satoh¹, Takeshi Oi², Mineo Hiromatsu³, Ryo Matsumoto² (1.Institute for Geo-Resources and Environment, Geological Survey of Japan, AIST, 2.Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University, 3.Center for Earth Information Science and Technology, JAMSTEC)

*Takeshi Oi¹, Fumio Akiba², Ryo Matsumoto¹ (1.Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University, 2.Diatom Minilabo Akiba Company Limited)