*Hironobu Kan¹, Masayuki Nagao², Kazuhiko Fujita³, Hitoshi Hasegawa⁴, Yosuke Nakashima⁵, Nobuyuki Hori⁶ (1.Graduate School of Integrated Sciences for Global Society, Kyushu University, 2.Research Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology, 3.Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus, 4.Department of Geography and Environmental Studies, Kokushikan University, 5.Ariake National College of Technology, 6.Nara University)

*Kazuhiko Fujita¹, Tohru Sasaki¹, Masaaki Chinen¹ (1.Department of Physics and Earth Sciences, University of the Ryukyus)

*Ayumi Maeda¹, Kazuhiko Fujita², Atsushi Suzuki³, Keiji Horikawa⁴, Toshihiro Yoshimura¹, Hodaka Kawahata¹ (1.Atomosphere and Ocean Research Institute, The University of Tokyo, 2.Department of Physics and Earth scieneces, University of the Ryukyus, 3.Geological Survey of Japan National Institute of Advanced Industrial Sience and Technology, 4.Graduate School of Engineer and Science, University of Toyama)

*Ryuji Asami¹, Matsumi Yoshimura¹, Shogo Minei¹, Chuki Hongo², Kazuhiko Fujita¹ (1.Department of Physics and Earth Sciences, University of the Ryukyus, 2.University of the Ryukyus)