*TAMAKI WAKABAYASHI^1,4, Takahito Kazama¹, Hiromitsu Oshima², Kazumi Okada², Yuichi Imanishi³, Ryuichi Nishiyama³, Kazuhiro Naganawa¹, Ryo Oyanagi¹, Takahiro Ohkura⁴, Shin Yoshikawa⁴ (1.Graduate School of Science, Kyoto University, 2.Hokkaido University, 3.Earthquake Research Institute, The University of Tokyo, 4.Aso Volcanological Laboratory, Kyoto University)