Verification and recovery of thick deposits of massive gas hydrate from chimney structures, eastern margin of Japan Sea

Ryo Matsumoto1, Yoshitaka Kakuwa2, Glen Tritch Snyder2, Manabu Tanahashi2, Yutaka Yanagimoto3 and Sumito Morita4, (1)Meiji University, Gas Hydrate Research Laboratory, Tokyo, Japan, (2)Meiji University, Gas Hydrate Laboratory, Kawasaki, Japan, (3)Meiji University, Gas Hydrate Laboratory, Tokyo, Japan, (4)Geological Survey of Japan, AIST, Tsukuba, Ibaraki, Japan