Kouku Inoue², *Wataru Tanikawa¹, Yoshitaka Hashimoto², Osamu Tadai⁴, Manami Kitamura⁵, Yohei Hamada¹, Takehiro Hirose¹, Weiren Lin³ (1.Japan Agency for Marine-Earth Science and Technology, Kochi Instutute for Core Sample Research, 2.Kochi University, 3.Kyoto University, 4.Marine Works Japan LTD., 5.AIST)