Methane seep events of the southern Joetsu Knoll since middle Pleistocene based on benthic foraminifera

Takeshi Oi1, Fumio Akiba2, Ryo Matsumoto3 and Yoshitaka Kakuwa3, (1)Meiji University, Gas Hydrate Laboratory, Kawasaki, Japan, (2)Diatom Mini lab., Hanno, Japan, (3)Meiji University, Gas Hydrate Research Laboratory, Tokyo, Japan