*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)