*Yuichi Nishimura¹, Yasuhiro Takashimizu², Takashi Ishizawa³, Daisuke Sugawara³ (1.Graduate School of Science, Hokkaido University, 2.Faculty of Education, Niigata University, 3.International Research Institute of Disaster Science, Tohoku University)

*Yasuhiro Takashimizu¹, Yuichi Nishimura², Kohei Iwaki³ (1.Niigata University, 2.Hokkaido University, 3.Tomikawa Junior High School)

*Takashi Ishizawa¹, Yuichi Nishimura², Yasuhiro Takashimizu³, Daisuke Sugawara¹, Yosuke Miyairi⁴, Yusuke Yokoyama⁴ (1.International Research Institute of Disaster Science, Tohoku University, 2.Institute of Seismology and Volcanology, Hokkaido University, 3.Niigata University, 4.Atomosphere and Ocean Research Institute, the Univeristy of Tokyo)