*Yusuke Miyajima^1,3, Yumiko Watanabe¹, Akira Ijiri², Akiko S Goto³, Robert Jenkins³, Takashi Hasegawa³, Saburo Sakai⁴, Ryo Matsumoto⁵ (1.Department of Geology and Mineralogy, Division of Earth and Planetary Sciences, Graduate school of Science, Kyoto University, 2.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3.School of Natural System, College of Science and Engineering, Kanazawa University, 4.Department of Biogeochemistry, JAMSTEC, 5.Gas Hydrate Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University)

*Takashi Hasegawa¹, Soichiro Muta², Akiko S. Goto¹, James Crampton³ (1.Division of Global Environmental Science and Engineering, Institute of Natural Science and Technology, Kanazawa University, 2.Graduate School of Natural Science and Technology, Kanazawa University (present affiliation: JOGMEC), 3.GNS Science, New Zealand)

*Riku Naito¹, Haruka Takagi², Kazuyoshi Moriya^1,3, Akiko Goto Sakurai⁴, Takashi Hasegawa⁴ (1.Department of Earth Sciences,Resources and Environmental Engineering, Graduate School of Creative Science and Engineering, Waseda University, 2.Atmosphere and Ocean Research Institute, the University of Tokyo, 3.Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University, 4.Institute of Science and Engineering, Faculty of Natural System, Kanazawa University)

*Chiharu Nakase², Takashi Hasegawa¹, Akiko S. Goto¹, Kotaro Toyama¹, Ryo Okino³ (1.Faculty of Natural System, Institute of Natural Science and Technology, Kanazawa University, 2.Division of Global Environmental Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University, 3.Mitsubishi Material Techno Co.Ltd.)