*Zenshiro Saito¹, Yasuo Ogawa², Masahiro Ichiki³, Atsushi Suzuki¹, yusuke kinoshita¹, Puwis Amatyakul⁴ (1.Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2.Volcanic Fluid Research Center Tokyo Institute of Technology, 3.Graduate School of Science, Tohoku University, 4.Department of Physics, Faculty of Science, Mahidol University)

Atsushi Suzuki², *Yasuo Ogawa¹, Zenshiro Saito², Masashi Ushioda⁵, Hiroshi Ichihara³, Masahiro Ichiki⁴, Masaaki Mishina (1.VFRC Titech, 2.EPS Titech, 3.Kobe Univ., 4.Tohoku Univ., 5.AIST)

*yusuke kinoshita¹, Yasuo Ogawa¹, Atsushi Suzuki¹ (1.Tokyo Institute of Technology)

*Ryokei Yoshimura¹, Ken'ichi Yamazaki¹, Yasuo Ogawa², Shingo Kawasaki¹, Jun Nakagawa¹, Shintaro Komatsu¹, Itaru Yoneda¹, Yuhei Ouchi³, Atsushi Suzuki⁴, Zenshiro Saito⁴, Masahiro Teraishi¹ (1.Disaster Prevention Research Institute, Kyoto University, 2.Volcanic Fluid Research Center, Tokyo Institute of Technology, 3.Graduate School of Science, Kyoto University, 4.Graduate School of Science, Tokyo Institute of Technology)

*Kaori Seki¹, Wataru Kanda², Toshiya Tanbo³, Takeshi Ohba⁴, Yasuo Ogawa², Shinichi Takakura⁵, Kenji Nogami², Masashi Ushioda⁵, Atsushi Suzuki¹, Zenshiro Saito¹, Yasuo Matsunaga¹ (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Volcanic Fluid Research Center, Tokyo Institute of Technology, 3.Tateyama Caldera Sabo Museum, Toyama Prefecture, 4.Department of Chemistry, Tokai University, 5.National Institute of Advanced Industrial Science and Technology)

*Yasuo Matsunaga¹, Wataru Kanda², Shinichi Takakura³, Takao Koyama⁴, Yasuo Ogawa², Kaori Seki¹, Atsushi Suzuki¹, Zenshiro Saito¹ (1.Department of Earth and Planetary Sciences, Graduate School of Science, Tokyo Institute of Technology, 2.Volcanic Fluid Research Center, Tokyo Institute of Technology, 3.National Institute of Advanced Industrial Science and Technology, 4.Earthquake Research Institute, University of Tokyo)