*Takahiro Ohkura¹, Shin Yoshikawa¹, Hiroyuki Inoue¹ (1.Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University)

*Haruhisa Nakamichi¹, Masato Iguchi¹, Takeshi Tameguri¹ (1.Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University)

*Shiro Ohmi¹, Masato Iguchi², Takeshi Tameguri², Haruhisa Nakamichi² (1.Earthquake Hazards Division, Disaster Prevention Research Institute, Kyoto University, 2.Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University)

*Mohammad Hasib¹, Takeshi Nishimura¹ (1.Department of Geophysics, Graduate School of Science, Tohoku University)

*Noriaki Mizutani¹, Akihiko Terada¹, Testuro Noda (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology)

*Muga Yaguchi¹, Takeshi Ohba², Akimichi Takagi¹, Keiichi Fukui¹ (1.Meteorological Research Institute, JMA, 2.Department of Chemistry, School of Science, Tokai University)

*Yoshikazu Kikawada¹, Yuko Hirayama², Shuhei Hamada² (1.Faculty of Science and Technology, Sophia University, 2.Sophia University)

*Kaori Seki¹, Takeshi Ohba², Hirochika Sumino³, Wataru Kanda¹, Muga Yaguchi⁴, Toshiya Tanbo⁵ (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Department of chemistry, School of Science, Tokia University, 3.Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 4.Meteorological Research Institute, JMA, 5.Tateyama Caldera Sabo Museum, Toyama Prefecture)

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

*Yasuhiro Fujimitsu¹, Jun Nishijima¹ (1.Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University)