*Yasuo Matsunaga¹, Wataru Kanda², Shinichi Takakura³, Takao Koyama⁴, Yasuo Ogawa², Kaori Seki¹, Atsushi Suzuki¹, Zenshiro Saito¹ (1.Department of Earth and Planetary Sciences, Graduate School of Science, Tokyo Institute of Technology, 2.Volcanic Fluid Research Center, Tokyo Institute of Technology, 3.National Institute of Advanced Industrial Science and Technology, 4.Earthquake Research Institute, University of Tokyo)

*Tomoyoshi Kuwahara¹, Akihiko Terada², Yohei Yukutake³, Wataru Kanda², Yasuo Ogawa² (1.Graduate School of Science and Engneering, Tokyo Insutitute of Technology, 2.Volcanic Fliud Research Center, Tokyo Insutitute of Technology, 3.Hot Springs Research Institute of Kanagawa Prefecture)

*Sayaka WADA¹, MASAMICHI NAKAMURA¹, Yoshihiro Otsuka¹, Sei IIJIMA¹ (1.Japan Meteorological Agency)

*Yoshihiro Otsuka¹, Minoru TAKEO² (1.Seismology and Volcanology Department,JMA, 2.Earthquake Research Institute, University of Tokyo)

*Masaaki Morita¹, Toshiya Mori¹, Ryunosuke Kazahaya², Hiroshi Tsuji³ (1.Geochemical Research Center, Graduate School of Science, The University of Tokyo, 2.Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan, AIST, 3.Earthquake Research Institute, The University of Tokyo)

*Ryou Honda¹, Yohei Yukutake¹, Shin'ichi Sakai², Yuichi Morita² (1.Hot Springs Research Institute of Kanagawa Prefecture, 2.Earthquake Research Institute, University of Tokyo)

*Muga Yaguchi¹, Takeshi Ohba¹, masakazu Sago¹, Asako Sekimoto¹ (1.Department of Chemistry, School of Science, Tokai University)

*tomozo Ono¹, Taisei Morishita¹, Shogo Hamasaki¹, Kenji Nogami² (1.Japan coast Guard, 2.Tokyo Institute of Technology)

*Yutaka Nagaoka¹, Akimichi Takagi¹, Kenji Nakata², Kazuhiro Kimura² (1.Volcanology Research Department, Meteorological Research Institute, 2.Seismology and Tsunami Research Department, Meteorological Research Institute)

*Mitsuru Utsugi¹ (1.Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University)