*Yuki Tomimatsu¹, Tetsuji Onoue², Daisuke Yamashita³, Tatsuo Nozaki^4,5,6,7, Yutaro Takaya⁸ (1.Graduate school of Science and Technology, Kumamoto University, 2.Faculty of Advanced Science and Technology, Kumamoto University , 3.Satsumasendai City Office, 4.Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 5.Frontier Research Center for Energy and Resources (FRC- ER), Graduate School of Engineering, Tokyo University, 6.Department of Planetology, Graduate School of Science, Kobe University, 7.Ocean Resources Research Center for Next Generation, Chiba Institute of Technology, 8.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University)