*Leona Suzuki¹, Akihiko Terada¹, Muga Yaguchi², Masanori Takahashi¹, Takeshi Ohba³ (1.Tokyo Institute of Technology, 2.Meteorological Research Institute,JMA, 3.Department of chemistry,School of Science,Tokai University)

*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)

*Muga Yaguchi¹, Takeshi Ohba², Akihiko Terada³ (1.Volcanology Research Department, Meteorological Research Institute, Japan Meteorological Agency, 2.Department of Chemistry, School of Science, Tokai University, 3.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology)

*Hirochika Sumino¹, Kotaro Toyama¹, Takeshi Ohba², Muga Yaguchi³, Akihiko Terada⁴ (1.Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 2.Department of Chemistry, School of Science, Tokai University, 3.Meteorological Research Institute, Japan Meteorological Agency, 4.Volcanic Fluid Research Center, Tokyo Institute of Technology)

*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)

*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)

*Hirochika Sumino¹, Kotaro Toyama¹, Takeshi Ohba², Muga Yaguchi³ (1.Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 2.Department of Chemistry, Tokai University, 3.Meteorological Research Institute)

*Kotaro Toyama¹, Hirochika Sumino¹, Muga Yaguchi², Takeshi Ohba³, Takashi Toyofuku⁴, Shigeki Wada⁵ (1.The University of Tokyo, 2.Meteorological Research Institute, 3.Tokai Univ., 4.JAMSTEC, 5.Shimoda Marine Research Center, University of Tsukuba)