*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)

*Wataru Kanda¹, Yasuo Matsunaga¹, Takao Koyama² (1.School of Science, Tokyo Institute of Technology, 2.Earthquake Research Institute, University of Tokyo)

*Wataru Kanda¹, Yasuo Matsunaga¹, Takao Koyama² (1.School of Science, Tokyo Institute of Technology, 2.Earthquake Research Institute, University of Tokyo)