Kuo Hsuan Tseng¹, *Yasuo Ogawa¹, Nurhasan Nurhasan¹, Sabri Bülent Tank¹, Yoshimori Honkura¹, Naoto Ujihara¹, Akihiko Terada¹, Yoshiya Usui¹, Wataru Kanda¹ (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology)

*Kuo Hsuan Tseng¹, Yasuo Ogawa² (1.Tokyo Institute of Technology, 2.Volcanic Fluid Research Center, Tokyo Institute of Technology)

*Ryokei Yoshimura¹, Yasuo Ogawa², Masato Fukai³, Jun Nakagawa¹, Ayako Namigishi¹, Koki Aizawa⁴, Yuto Yamamoto⁵, Tomoya Yamazaki¹, Tsutomu Miura¹, Mikihiro Nakamoto¹, Airi Nagaoka¹, Naoya Takamura⁶, Naoto Oshiman¹ (1.Disaster Prevention Research Institute, Kyoto University, 2.VFRC, School of Science, Tokyo Institute of Technology, 3.School of Science, Tokyo Institute of Technology, 4.SEVO, Faculty of Science, Kyushu University, 5.Graduate School of Science, Kyushu University, 6.NT System Design Inc.)

Masato Fukai¹, *Yasuo Ogawa¹, Shinichi Takakura², Masaaki Mishina³ (1.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 2.AIST, 3.Tohoku University)

Aoi Motoyama¹, *Masahiro Ichiki¹, Yasuo Ogawa², Makoto Uyeshima³, Koichi Asamori⁴, Toshihiro Uchida⁵, Takao Koyama³, Shin'ya Sakanaka^3,6, Hideaki Hase^3,8, Koki Aizawa^3,7, Yusuke Yamaya^3,5 (1.Graduate School of Science, Tohoku University, 2.School of Science, Tokyo Institute of Technology, 3.Earthquake Research Institute, The University of Tokyo, 4.Tono Geoscience Center, Japan Atomic Energy Agency, 5.National Institute of Advanced Industrial Science and Technology, 6.Graduate School of International Resource Science, Akita University, 7.Graduate School of Science, Kyushu University, 8.Geothermal Energy and Development Co. Ltd.)

*Graham Hill^1,2, Hugh Bibby³, Jared Peacock⁴, Erin Wallin⁵, Yasuo Ogawa⁶, Luca Caricchi⁷, Harry Keys⁸, Stewart Bennie³, Yann Avram⁹ (1.Institute of Geophysics, Czech Academy of Science, Prague, Czech Republic, 2.Gateway Antarctica, University of Canterbury, Christchurch, New Zealand, 3.GNS Science, Lower Hutt, New Zealand, 4.United States Geological Survey, Menlo Park CA, USA, 5.United States Army Corps of Engineers, Huntsville AL, USA, 6.Volcanic Fluid Research Centre, Tokyo Institute of Technology, Tokyo, Japan, 7.Department of Earth Sciences, University of Geneva, Geneva, Switzerland, 8.Department of Conservation, Turangi, New Zealand, 9.Phoenix Geophysics, Toronto, Canada)

*Yoshiya Usui^1,2, Makoto Uyeshima¹, Tsutomu Ogawa¹, Ryokei Yoshimura³, Naoto Oshiman³, Satoru Yamaguchi⁴, Hiroaki Toh⁵, Hideki Murakami⁶, Koki Aizawa⁷, Toshiya Tanbo⁸, Yasuo Ogawa⁹, Tadashi Nishitani¹⁰, Shin'ya Sakanaka¹⁰, Masaaki Mishina¹¹, Hideyuki Satoh¹², Tada-nori Goto¹³, Takafumi Kasaya¹⁴, Toru Mogi¹⁵, Yusuke Yamaya¹⁶, Ichiro Shiozaki¹⁷, Yoshimori Honkura¹⁸ (1.Earthquake Research Institute, the University of Tokyo, 2.ITOCHU Techno-Solutions Corporation, 3.Disaster Prevention Research Institute, Kyoto University, 4.Graduate School of Science, Osaka City University, 5.Graduate School of Science, Kyoto University, 6.Natural Sciences Cluster-Science and Technology Unit, Research and Education Faculty, Kochi University, 7.Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, 8.Tateyama Caldera Sabo Museum, 9.Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology, 10.Graduate School of International Resource Sciences, Akita University, 11.Graduate School of Science, Tohoku University, 12.Nuclear Regulation Department, Nuclear Regulation Authority, 13.Graduate School of Life Science, University of Hyogo, 14.Japan Agency for Marine–Earth Science and Technology, 15.Faculty of Science, Hokkaido university, 16.National Institute of Advanced Industrial Science and Technology, 17.Graduate School of Engineering, Tottori University, 18.Graduate School of Science and Engineering, Tokyo Institute of Technology)