Saki Tsutsumi¹, *Jun-ichiro Ishibashi¹, Tatsuo Nozaki², Yutaro Takaya³ (1.Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 2.Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University)

*Yasuhiro Kato^1,2,3, Koichiro Fujinaga^3,1, Kentaro Nakamura^1,2, Kazutaka Yasukawa^1,3, Junichiro Ohta¹, Yutaro Takaya^4,1, Koichi Iijima², Shiki Machida^2,1, Tatsuo Nozaki^2,1, Jun-Ichi Kimura², Katsuhiko Suzuki², Hikaru Iwamori^2,5 (1.Department of Systems Innovation, Graduate School of Engineering, University of Tokyo, 2.Japan Agency for Marine-Earth Science and Technology, 3.Chiba Institute of Technology, 4.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University, 5.Tokyo Institute of Technology)

*Koichiro Fujinaga^1,2, Kazutaka Yasukawa^2,1, Shiki Machida^3,2, Tatsuo Nozaki^3,2, Yutaro Takaya^4,2, Junichiro Ohta², Kazutaka Oya², Daiki Niikuma⁴, Yoshiro Nishio⁵, Yuka Masaki³, Yoichi Usui³, Satoru Haraguchi³, Koichi Iijima³, Hiroshi Amakawa³, Katsuhiko Suzuki³, Kentaro Nakamura^2,3, Yasuhiro Kato^2,3,1, MR15-E02 Leg.2 cruise members (1.Chiba Institute of Technology, 2.Department of Systems Innovation, School of Engineering, University of Tokyo, 3.Japan Agency for Marine-Earth Science and Technology, 4.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University, 5.Research and Education Faculty, Kochi University)

*Yutaro Takaya^1,2,3, Koichiro Fujinaga^4,3,2, Yasuhiro Kato^3,2 (1.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University, 2.Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 3.Department of Systems Innovation, Graduate School of Engineering, University of Tokyo, 4.Chiba Institute of Technology)

*Honami Sato¹, Tatsuo Nozaki¹, Tetsuji Onoue², Jun-Ichi Kimura¹, Qing Chang¹, Yutaro Takaya³, Yasuhiro Kato⁴, Katsuhiko Suzuki¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.Kumamoto University, 3.Waseda University, 4.The University of Tokyo)