*Ryokei Yoshimura¹, Ken'ichi Yamazaki¹, Yasuo Ogawa², Jun Nakagawa¹, Shingo Kawasaki¹, Shintaro Komatsu¹, Itaru Yoneda¹, Yuhei Ouchi³, Tomohisa Okazaki³, Atsushi Suzuki⁴, Zenshiro Saito⁴, Yoshiya Usui⁴, Masahiro Teraishi¹ (1.Disaster Prevention Research Institute, Kyoto University, 2.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 3.Graduate school of Science, Kyoto University, 4.Graduate school of Science and Engineering, Tokyo Institute of Technology)

*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)

*Ryokei Yoshimura¹, Ken'ichi Yamazaki¹, Yasuo Ogawa², Jun Nakagawa¹, Shingo Kawasaki¹, Shintaro Komatsu¹, Itaru Yoneda¹, Yuhei Ouchi³, Tomohisa Okazaki³, Atsushi Suzuki⁴, Zenshiro Saito⁴, Yoshiya Usui⁴, Masahiro Teraishi¹ (1.Disaster Prevention Research Institute, Kyoto University, 2.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 3.Graduate school of Science, Kyoto University, 4.Graduate school of Science and Engineering, Tokyo Institute of Technology)

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.)

*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)