*Yuma OURA¹, Hiroki HAYASHI², Kouzi KAMEO³ (1. Chiba University Graduate School of Science and Engineering , 2. Shimane University Academic Assembly, 3. Chiba University Faculty of Science)

*Souki HIROTA¹, Koji KAMEO², Daisuke KUWANO¹ (1. Chiba University Graduate School of Science and Engineering, 2. Chiba University Graduate School of Science)

*Juichiro Ashi¹, Ayanori Misawa², Ken Ikehara², Toshiya Kanamatsu³, Makoto Yamano¹ (1. UTokyo, 2. AIST, 3. JAMSTEC)

*Yoshiaki Suzuki¹, Takuya Itaki¹, Hajime Katayama¹, Naotomo Kaneko¹, Hirokazu Yamamoto¹, Osamu Ishizuka¹, Mutsumi Iizuka^1,2, Eri Ikeuchi^1,3, Kazuma Oikawa⁴, Taiga Nakano⁵ (1. AIST, 2. Hokkaido University, 3. University of Miyazaki, 4. Tohoku University, 5. Yamaguchi University)

Jun Arimoto¹, *Seishiro Furuyama², Mayu Ogawa^2,3, Hiroaki Koge¹, Osamu Ishizuka^1,4, Ayanori Misawa¹, KH20-7 Exp. Scientists (1. AIST, 2. Tokyo Univ. of Marine Science and Technology, 3. Kyoto Univ., 4. JAMSTEC)