*Glen Snyder^1,2、Naoto Takahata²、Stephen Alan Bowden³、Naizhong Zhang⁴、Renat B. Shakirov⁵、Hitoshi Tomaru⁶、Fumito Shiraishi⁷、Yuji Sano⁸、Ryo Matsumoto¹ (1.Gas Hydrate Research Lab, Meiji Univeristy、2.Atmosphere and Ocean Research Institute, University of Tokyo、3.University of Aberdeen、4.Earth-Life Science Institute, Tokyo Institute of Technology、5.Pacific Oceanological Institute、6.Chiba University、7.Hiroshima University、8.Kochi University)