*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)

*Tomoki Tsutsui¹, Takeshi Tameguri², Masato Iguchi², Haruhisa Nakamichi², hiromitsu oshima³, Hiroshi Aoyama³, Sadato Ueki⁴, Mare Yamamoto⁴, Kenji Nogami⁵, Minoru Takeo⁶, Takao Ohminato⁶, Mie Ichihara⁶, Jun Oikawa⁶, Takao Koyama⁶, Yuta Maeda⁷, Takahiro Ohkura², Hiroshi Shimizu⁸, Takeshi Matsushima⁸, Hiroki Miyamachi⁹, Reiji Kobayashi⁹, Hiroshi Yakiwara⁹ (1.Akita University, 2.Kyoto University, 3.Hokkaido University, 4.Tohoku University, 5.Tokyo Institute of Technology, 6.University of Tokyo, 7.Nagoya University, 8.Kyushu University, 9.Kagoshima University)

*tomozo Ono¹, Taisei Morishita¹, Shogo Hamasaki¹, Kenji Nogami² (1.Japan coast Guard, 2.Tokyo Institute of Technology)

*Tatsuro Chiba¹, Hisashi Sasaki¹, sonoka tsukuda¹, Kenji Nogami² (1.Asia Air Survey Co., Ltd., 2.Tokyo Tech University)