*yasuha Wakabayashi¹, Hitoshi Tomaru¹ (1.Chiba university)

*yasuha Wakabayashi¹, Hitoshi Tomaru¹ (1.Chiba university)

*Satoko Owari¹, Hitoshi Tomaru¹, Ryohei Kameda¹, Ryo Matsumoto² (1.Chiba university, 2.Meiji University)

*Glen Snyder¹, Ryo Matsumoto¹, Yoshihiro Kakizaki¹, Hitoshi Tomaru³, Yohey Suzuki² (1.Gas Hydrate Research Lab, Meiji Univeristy, 2.Department of Earth and Planetary Science, University of Tokyo, 3.Department of Earth Sciences, Chiba University)

*Naoto Ishida¹, Naoshi Mizumoto², Katsuki Kawahara², Hitoshi Tomaru³, Takao Ebinuma¹, Ryo Matsumoto⁴ (1.Social Systems and Civil Engineering, Graduate School of Engineering, Tottori University, 2.Department of Civil Engineering, Faculty of Engineering, Tottori University, 3.Department of Earth Sciences, Chiba University, 4.Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University)

*Hideki Numanami¹, Takashi Okutani², Remi Warabi³, Hitoshi Tomaru⁴, Takeshi Kobayashi², Ryo Matsumoto³ (1.Department of Home Economics, Faculty of Home Economics, Tokyo Kasei-Gakuin University, 2.Tokyo University of Marine Science and Technology, 3.Meiji University, 4.Chiba University)

*Hitoshi Tomaru¹, Hideki Numanami², Ryo Matsumoto³ (1.Department of Earth Sciences, Chiba University, 2.Tokyo Kasei Gakuin University, 3.Gas Hydrate Laboratory, Meiji University)

*Mamata Tsuyoshi¹, Ryosuke Nakajima¹, Hitoshi Tomaru¹, Ryo Matsumoto² (1.Department of Earth Sciences, Chiba University, 2.Gas Hydrate Laboratory, Meiji University)

*Ryohei Kameda¹, Yoshihiro Kakizaki², Hitoshi Tomaru¹, Ryo Matsumoto² (1.Faculty of Science,Chiba University, 2.Gas Hydrate Laboratory, Meiji University)

*Aya Iguchi¹, Hitoshi Tomaru¹, Tatsuya Motegi², Naoto Ishida², Ryo Matsumoto³ (1.Chiba University, 2.Tottori University, 3.Meiji University)

*Minori Chikada¹, Hitoshi Tomaru¹, Ryo Matsumoto² (1.Faculty of Science, Chiba University, 2.Organization for the Strategic Laboratory of Research and Intellectual Properties, Meiji University)

*Mamata Tsuyoshi¹, Ryosuke Nakajima¹, Hitoshi Tomaru¹, Ryo Matsumoto² (1.Department of Earth Sciences, Chiba University, 2.Gas Hydrate Laboratory, Meiji University)

*Ryohei Kameda¹, Yoshihiro Kakizaki², Hitoshi Tomaru¹, Ryo Matsumoto² (1.Faculty of Science,Chiba University, 2.Gas Hydrate Laboratory, Meiji University)

*Aya Iguchi¹, Hitoshi Tomaru¹, Tatsuya Motegi², Naoto Ishida², Ryo Matsumoto³ (1.Chiba University, 2.Tottori University, 3.Meiji University)

*Minori Chikada¹, Hitoshi Tomaru¹, Ryo Matsumoto² (1.Faculty of Science, Chiba University, 2.Organization for the Strategic Laboratory of Research and Intellectual Properties, Meiji University)