*Akito Araya¹, Akiteru Takamori¹, Akio Katsumata², Akio Kobayashi², Takeo Ito³, Takashi OKUDA³, Makoto OKUBO⁴ (1.Earthquake Research Institute, University of Tokyo, 2.Meteorological Research Institute, Japan Meteorological Agency, 3.Graduate School of Environmental Studies, Nagoya University, 4.Natural Science Cluster, Kochi University)