Sea level changes probably controlled the development of the shallow gas hydrate accumulations in the eastern margin of the Sea of Japan

Manabu Tanahashi1, Yoshitaka Kakuwa1, Shiro Ohkawa1, Sumito Morita2 and Ryo Matsumoto1, (1)Meiji University, Gas Hydrate Research Laboratory, Tokyo, Japan, (2)Geological Survey of Japan, AIST, Tsukuba, Ibaraki, Japan