*Yasuo Matsunaga¹, Wataru Kanda², Shinichi Takakura³, Takao Koyama⁴, Tatsuji Nishizawa² (1.Department of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology, 2.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 3.National Institute of Advanced Industrial Science and Technology, 4.Earthquake Research Institute, University of Tokyo)

*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)

*Yuri Mitsude¹, Tatsuji Nishizawa², Hitomi Nakamura^3,4,5, Tatiana Churikova⁶, Boris Gordeychik⁷, Akira Ishikawa³, Ryo Fujita³, Hikaru Iwamori^1,3,8, Shuhei Sakata¹ (1.Earthquake Research Institute, The University of Tokyo, 2.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 3.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 4.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 5.Chiba Institute of Technology, ORCeNG, 6.Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, 7.Institute of Experimental Mineralogy, Russian Academy of Sciences, 8.research institute for marine geodynamics, Japan Agency for Marine-Earth Science and Technology)

*Tatsuji Nishizawa¹, Hitomi Nakamura^2,3,4,5, Hikaru Iwamori^3,4,6 (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 2.Institute of Earthquake and Volcano Geology, Geological Survey of Japan, AIST, 3.Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology, 4.Depeartment of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology, 5.ORCeNG, Chiba Institute of Technology, 6.Earthquake Research Institute, The University of Tokyo)