*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)

*Hironori Tashiro¹, JING ZHANG², Naoya Wada³, Kazuto Sazawa², Kazuhiro Toyama⁴ (1.Graduate School of Science and Engineering for Education, University of Toyama, 2.Graduate School of Science and Engineering for Research, University of Toyama, 3.Center for far Eastern Studies, University of Toyama, 4.Information Technology Center, University of Toyama)

*Hirochika Sumino¹, Kohei Yamane², Kaori Kawana¹, Toshiya Mori³, Aya Shimizu⁴, Kenji Notsu⁵, Pedro Hernández⁶ (1.Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 2.Department of Integrated Science, College of Arts and Science, University of Tokyo, 3.Geochemical Research Center, Graduate School of Science, University of Tokyo, 4.Tokyo Metropolitan Industrial Technology Research Institute, 5.Center for Integrated Research and Education of Natural Hazards, Shizuoka University, 6.Instituto Volcanolo´gico de Canarias)

*Shinya Nagato¹, Kouichi Uhira¹, Kouji Kato¹, Yuuko Sekiguchi¹ (1.Japan Meteorological Agency)

*Minoru Takeo¹, Yuta Maeda², Ryunosuke KAZAHAYA³ (1.Earthquake Research Institute, University of Tokyo, 2.Nagoya University, 3.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

*Genji Saito¹, Osamu Ishizuka¹, Yoshihiro Ishizuka¹, Hideo Hoshizumi¹ (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

*Akimichi Takagi¹, Keiichi Fukui¹, Muga Yaguchi¹ (1.Volcanology Research Department, Meteorological Research Institute)

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