Chiya Sugihara¹, *Akihiro Kano¹, Katsunori Yanagawa¹, Tomoyo Okumura², Chizuru Takashima³ (1.Graduate School of Social and Cultural Studies, Kyushu University, 2.JAMSTEC, 3.Saga University)

*Katsunori Yanagawa¹, Atsushi Tani², Naoya Yamamoto², Akihiro Hachikubo³, Akihiro Kano¹, Ryo Matsumoto⁴, Yohey Suzuki⁵ (1.Graduate School of Social and Cultural Studies, Kyushu University, 2.Department of Earth and Space Science, Graduate School of Science, Osaka University, 3.Environmental and Energy Resources Research Center, Kitami Institute of Technology, 4.Gas Hydrate Laboratory, Meiji University, 5.Department of Earth and Planetary Science, University of Tokyo)

*Kohei Ino¹, Mariko Kouduka¹, Michinari Sunamura¹, Katsunori Yanagawa², Toyoho Ishimura³, Yohey Suzuki¹ (1.Graduate School of Science, The University of Tokyo, 2.Graduate School of Social and Cultural Studies, Kyushu University, 3.National Institute of Technology, Ibaraki College)

*Yasuhiko T. Yamaguchi¹, Mariko Kouduka¹, Toshitsugu Yamazaki², Noriko Kawamura³, Koji Seike², Yukihiro SAKURAMOTO², Natsumi Okutsu², Yohey Suzuki¹ (1.Department of Earth and Planetary Science, The University of Tokyo, 2.Atmosphere and Ocean Research Institute, The University of Tokyo, 3.Japan Coast Guard Academy)

*Yoshinori Takano¹, Yusuke Yokoyama², Manabu Fukui³ (1.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2.Atmosphere and Ocean Research Institute, University of Tokyo, 3.Institute of Low Temperature Science, Hokkaido University)