*Shota Amekawa¹, Kenji Kashiwagi², Masako Hori³, Tomomi Sone⁴, Hirokazu Kato¹, Tomoyo Okumura⁵, Tsai-Luen Yu⁶, Chuan-Chou Shen^6,7,8, Akihiro Kano¹ (1.Graduate School of Science, The University of Tokyo, 2.Department of Environmental Biology and Chemistry, Faculty of Science, University of Toyama, 3.Division of Natural Sciences, Osaka Kyoiku University, 4.Marine Works Japan LTD., 5.Center for Advanced Marine Core Research, Kochi University, 6.High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, 7.Global Change Research Center, National Taiwan University, 8.Research Center for Future Earth, National Taiwan University)

*Glen Snyder¹, Naizhong Zhang², Stephen Bowden⁵, Yoshihiro Kakizaki³, Naoto Takahata⁴, Kentaro Tanaka⁴, Yuji Sano⁴, Ryo Matsumoto¹ (1.Gas Hydrate Research Lab, Meiji Univeristy, 2.Earth-Life Science Institute, Tokyo Institute of Technology, 3.Dept. Earth and Planetary Sci., Univ. Tokyo, 4.Atmophere and Ocean Research Institute, Univ. Tokyo, 5.School of Geosciences, Univ. Aberdeen, Scotland)

*Kiichiro Kawamura¹ (1.Yamaguchi University)

*Yunosuke Hase¹, Akihiro Hachikubo¹, Satoshi Yamashita¹, Hirotoshi Sakagami¹, Masaaki Konishi¹, Hirotsugu Minami¹, Kenji Nishina², Tadashi Misaka³ (1.Kitami Institute of Technology, 2.Geological Survey of Hokkaido, Hokkaido Research Organization, 3.Wakkanai Fisheries Research Institute, Hokkaido Research Organization)

*Naoto Ishida¹, Hidefumi Fujioka², Hitoshi Tomaru³, Takao Ebinuma¹, Ryo Matsumoto⁴ (1.Social Systems and Civil Engineering, Graduate School of Engineering, Tottori University, 2.Tottori Prefectural Fisheries Experiment Station, 3.Department of Sciences, Chiba University, 4.Gas hydrate Labratory, Meiji University)

*Ryuji Tada^1,2,3, Toshihiro Tada³, Jumpei Yoshioka⁴ (1.Geo-Cosmology Center, Chiba Institute of Technology, 2.Research Center for Earth System Science, Yunnan University, 3.Department of Earth and Planetary Science, the Univeristy of Tokyo, 4.Atmospheric and Ocean Research Institute, the University of Tokyo)

*Arisa Seki¹, Ryuji Tada^2,3,4, Shunsuke Kurokawa⁴, Masafumi Murayama⁵ (1.Faculty of Science, Shinshu University, 2.Chiba Institute of Technology, 3.Yunnan University, 4.Graduate School of Science, The University of Tokyo, 5.Faculty of Agriculture and Marine Science, Kochi University)

*Takuya Sagawa¹, Yusuke Narita², Takuya Matsuzaki³, Masafumi MURAYAMA⁴, Takashi Hasegawa¹, Akiko Goto¹, Takeshi Nakagawa⁵ (1.Institute of Science and Engineering, Kanazawa University, 2.Graduate School of Natural Science and Technology, Kanazawa University, 3.Center for Advanced Marine Core Research, Kochi University, 4.Faculty of Agriculture and Marine Science, Kochi Univeristy, 5.Ritsumeikan University)

*Asako Suzuki¹, Ken Sawada¹, Saki Yanou¹, Satoshi Furota², Tomohisa Irino³ (1.Graduate School of Science, Hokkaido University, 2.National Institute of Advanced Industrial Science and Technology, 3.Graduate School of Environment, Hokkaido University)

*Hiroshi Sato¹, Tatsuya Ishiyama¹, Tetsuo No², Makoto MATSUBARA³, Shuichi Kodaira² (1.Earthquake Research Institute, The University of Tokyo, 2.Japan Agency for Marine-Earth Science and Technology, 3.National Research Institute for Earth Science and Disaster Resilience)