*Wiebke Heise¹, Yasuo Ogawa², T Grant Caldwell¹, Edward A Bertrand¹, Hiroshi Ichihara³, Ryokei Yoshimura⁴, Stewart L Bennie¹, Zenshiro Saito², Kaori Seki², Yasuo Matsunaga², Atsushi Suzuki², Takahiro Kishita², Yusuke Kinoshita² (1.GNS Science, PO Box 30368, Lower Hutt, New Zealand, 2.Volcanic Fluid Research Center, Tokyo Institute of Technology, Tokyo, Japan, 3.Kobe Ocean-Bottom Exploration Center (KOBEC), Kobe University, Kobe, Japan, 4.Disaster Prevention Research Istitute, Kyoto University, Kyoto, Japan)

Yasuo Matsunaga¹, *Wataru Kanda¹, Shinichi Takakura², Takao Koyama³, Zenshiro Saito¹, Yasuo Ogawa¹, Kaori Seki¹, Atsushi Suzuki^1,4, Yusuke Kinoshita¹, Takahiro Kishita¹ (1.School of Science, Tokyo Institute of Technology, 2.National Institute of Advanced Industrial Science and Technology (AIST), 3.Earthquake Research Institute, University of Tokyo, 4.Now at: ITOCHU Techno-Solutions Co.)

*Takahiro Kishita¹, Wataru Kanda², Shinichi Takakura³, Kaori Seki¹, Yasuo Matsunaga¹, Yusuke Kinoshita¹, Koki Aizawa⁴ (1.Department of Earth Planetary Sciences, Tokyo Institute of Technology , 2.Volcanic Fluid Research Center, Tokyo Institute of Technology, 3.National Institute of Advanced Industrial Science and Technology, 4.Volcano Research Center, Earthquake Research Institute, University of Tokyo)

*Yusuke Kinoshita¹, Yasuo Ogawa¹, Zenshiro Saito¹, Rina Noguchi¹, Kiyoshi Fuji-ta², Satoru Yamaguchi³, Umeda Koji⁴, Koichi Asamori⁵, Masahiro Ichiki⁶ (1.Tokyo Institute of Technology, 2.Osaka University, 3.Osaka City University, 4.Hirosaki University, 5.Japan Atomic Energy Agency, 6.Touhoku University)

Zenshiro Saito², *Yasuo Ogawa¹, Masahiro Ichiki³, Hideyuki Satoh⁴, Yusuke Kinoshita², Atsushi Suzuki², Puwis Amatyakul¹ (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 2.Earth and Planetary Sciences, Tokyo Institute of Technology, 3.Graduate School of Science, Tohoku University, 4.National Institute of Advanced Industrial Science and Technology)

*Yusuke Kinoshita¹, Yasuo Ogawa¹, Zenshiro Saito¹, Rina Noguchi¹, Kiyoshi Fuji-ta², Satoru Yamaguchi³, Umeda Koji⁴, Koichi Asamori⁵, Masahiro Ichiki⁶ (1.Tokyo Institute of Technology, 2.Osaka University, 3.Osaka City University, 4.Hirosaki University, 5.Japan Atomic Energy Agency, 6.Touhoku University)

Zenshiro Saito², *Yasuo Ogawa¹, Masahiro Ichiki³, Hideyuki Satoh⁴, Yusuke Kinoshita², Atsushi Suzuki², Puwis Amatyakul¹ (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 2.Earth and Planetary Sciences, Tokyo Institute of Technology, 3.Graduate School of Science, Tohoku University, 4.National Institute of Advanced Industrial Science and Technology)