*Akihiko Terada¹, Akira Katori¹, Muga Yaguchi², Mare Yamamoto³, Taishi Yamada⁴, Shin'ya Onizawa², Tatsuji Nishizawa¹, Hiroshi Aoyama⁵, Yuichi Morita⁷, Takeshi Ohba⁶ (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 2.Meteorological Research Institute, JMA, 3.Graduate School of Science, Tohoku University, 4.Disaster Prevention Research Institute, Kyoto University, 5.Faculty of Science, Hokkaido University, 6.Department of chemistry, School of Science, Tokia University, 7.Earthquake Research Institute, University of Tokyo)

*Shin'ya Onizawa¹, Ryuichi Nishiyama², Shuhei Okubo^2,3, Yutaka Nagaoka¹, Yasuo Hirayama⁴, Takanori Ishihara⁴, Kensuke Matsuda⁴, Yuya Kaneko⁴, Yoshihiro Ueda⁴, Yuichi Imanishi², Atsushi Watanabe², Miwako Ando², Shikou Sakashita² (1.Meteorological Research Institute, JMA, 2.Earthquake Research Institute, The University of Tokyo, 3.Southwest Jiaotong University, 4.Seismological and Volcanological Department, JMA)

*Ryuichi Nishiyama¹, Yuichi Imanishi¹, Shin'ya Onizawa², Shuhei Okubo^1,3, Miwako Ando¹, Atsushi Watanabe¹, Shikou Sakashita¹, Yutaka Nagaoka², Yoshiyuki Tanaka⁴, Hidefumi Watanabe^1,5 (1.Earthquake Research Institute, The University of Tokyo, 2.Volcanology Research Department, Meteorological Research Institute, JMA, 3.Southwest Jiaotong University, 4.Graduate School of Science, The University of Tokyo, 5.Disaster Prevention Division, Tokyo Metropolitan Government)