*Masanori Takahashi¹, Akihiko Terada¹, Hirochika Sumino², Kotaro Toyama², Takeshi Ohba³, Leona Suzuki¹ (1.Volcanic Fluid Research Center, Tokyo Institute of Technology, 2.Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3.Department of chemistry, School of Science, Tokai University)

*Nozomi Numanami¹, Takeshi Ohba¹, Muga Yaguchi² (1.Department of Chemistry, School of Science, Tokai University, 2.Volcanology Research Department, Meteorological Research Institute)

*Urumu Tsunogai¹, Ryo Shingubara¹, Masanori Ito¹, Fumiko Nakagawa¹, Shin Yoshikawa², Mitsuru Utsugi², Akihiko Yokoo² (1.Graduate School of Environmental Studies, Nagoya University, 2.Graduate School of Science, Kyoto University)

*Takeshi Ohba¹, Muga Yaguchi², Nozomi Numanami¹, Yoichi Sasai³, Maria C L Barairo⁴, Paul Alanis⁴, Ma. Antonia V Bornas⁴, Shigekazu Kusumoto⁵, Toshiyasu Nagao³, Urumu Tsunogai⁶, Masanori Ito⁶, Ryo Shingubara⁶ (1.Dep. Chem. School Sci. Tokai Univ., Japan, 2.Meteorol. Res. Inst., Japan, 3.Inst. Oceanic Res. Development, Tokai Univ., Japan, 4.Philippine Inst. Volcanol. Seismol., Philippine, 5.Grad. School of Sci. Engineering Res. Univ. Toyama, Japan, 6.Grad. School of Envir. Studies Nagoya University, Japan)

*Manabu Hashimoto¹ (1.Disaster Prevention Research Institute, Kyoto University)

*Satoshi Miura¹, Micaela Colavita¹, Yu Morishita² (1.Graduate School of Science, Tohoku University, 2.Geospatial Information Authority of Japan)

*Yuji Himematsu¹, Taku Ozawa¹, Yosuke Aoki² (1.National Research Institute for Earth Science and Disaster Resilience, 2.Univ. of Tokyo)

*Takashi Hirose¹, Hideki Ueda¹, Eisuke Fujita¹ (1.National Research Institute for Earth Science and Disaster Resilience)

*Yuichi Morita¹, Takao Ohminato¹ (1.Earthquake Research Institute, University of Tokyo)

*Ryohei Kawaguchi¹ (1.Meteorological Research Institute)