*Masaaki MORITA¹, Toshiya MORI¹, Masato IGUCHI², Takeshi NISHIMURA³ (1.Geochem. Res. Center, Univ. of Tokyo, 2.DPRI, Kyoto Univ., 3.Dept. Geophys., Tohoku Univ.)

*Shinobu ANDO¹, Yuji MIURA², Toshiyuki MATSUMORI² (1.MRI, 2.JMA)

*Kosuke TAKAHASHI¹, Nobuo MATSUSHIMA², Shinichi TAKAKURA², Yusuke YAMAYA², Shin ARITA¹, Shingo NAGAMACHI¹, Masayuki OISHI², Ryunosuke KAZAHAYA², Ikuko FUJII¹ (1.Kakioka Magnetic Observatory, Japan Meteorological Agency, 2.National Institute of Advanced Industrial Science and Technology)

*Tetsuya SHIMAMURA¹, Shin ARITA¹, Norimichi MASHIKO¹, Ikuko FUJII¹, Keiichi FUKUI¹, Masashi OGISO² (1.Kakioka Magnetic Observatory, JMA, 2.Matsushiro Seismological Observatory, JMA)

*Yoshimi HIROI¹, Tsuyoshi MIYAMOTO² (1.Grad.Sci.Tohoku Univ., 2.CNEAS.,Tohoku Univ.)

*Toru TAKANO¹, Tsuyoshi INOUE², Masao BAN³, Teruki OIKAWA⁴, Seiko YAMASAKI⁴ (1.Graduate School of Department of Earth and Environmental Sciences, Yamagata University, 2.Nippon Koei Co., Ltd., 3.Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University, 4.Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advance)

*Tetsuya YAMAMOTO¹, Shinobu ANDO¹, Kazuya KOKUBO², Akio KOBAYASHI¹, Kazuhiro KIMURA¹ (1.Meteorological Research Institute, 2.Japan Meteorological Agency)

*Shin'ya ONIZAWA¹, Akimichi TAKAGI¹, Keiichi FUKUI², Shinobu ANDO¹ (1.Meteorological Research Institute, JMA, 2.Kakioka Magnetic Observatory, JMA)

*Miyo FUKUI¹, Takeshi MATSUSHIMA¹, Jun OIKAWA², Atsushi WATANABE², Takashi OKUDA³, Taku OZAWA⁴, Yosuke MIYAGI⁴, Yuhki KOHNO⁴ (1.SEVO, Kyushu University, 2.ERI, University of Tokyo, 3.EVRC, Nagoya University, 4.NIED, Japan)

*Koji ITO¹, Tomozo ONO¹, Noboru SASAHARA¹, Kenji NOGAMI² (1.Japan Coast Guard, 2.Volcanic Fruid Research Center, Tokyo Institute of Technology)