*Nozomu Iwasaki¹, Seongwon Lee¹, Atsushi Suzuki², Shogo Kato³, Hiroyuki Yokooka³, Shota Mitsui⁴, Jumpei Minatoya⁵, Iguchi Akira², Miyuki Nishijima² (1.Faculty of Geo-Environmental Science, Rissho University, 2.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 3. IDEA Consultants, Inc., 4.Marine Biological Research Institute of Japan Co., Ltd., 5.Japan Organization for Metals and Energy Security (JOGMEC))

*Yuki Ota¹, Masahiro Suzumura¹, Ayumi Tsukasaki¹, Atsushi Suzuki¹, Koji Seike^1,2, Jumpei Minatoya³ (1.National Institute of Advanced Industrial Science and Technology, 2.Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 3.Japan Organization for Metals and Energy Security (JOGMEC))

*Jinsub Park¹, Jaewoo Jung³, Kiho Yang^1,2 (1.Department of Oceanography, Pusan National University, Busan, Republic of Korea, 2.Department of Oceanography and Marine Research Institute, Pusan National University, Busan Republic of Korea, 3.Global Ocean Research Center, Korea Institute of Ocean Science & Technology, Busan, Republic of Korea )

*Hirokuni Oda¹, Wataru Katanoda^1,2, Akira Usui², Masafumi MURAYAMA², Yuhji Yamamoto² (1.Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 2.Kochi University)