*Yuichi Nishimura¹, Takashi Chiba² (1.Graduate School of Science, Hokkaido University, 2.Department of Environmental and Symbiotic Science, Rakuno Gakuen University)

Kohei Iwaki¹, *Yasuhiro Takashimizu¹, Yuichi Nishimura² (1.Geology Lab., Fuclty of Education, Niigata University, 2.Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University )

*Yuichi Nishimura¹, Yasuhiro Takashimizu², Kohei Iwaki², Takashi Ishizawa³, Daisuke Sugawara³, Yusuke Yokoyama⁴, Yosuke Miyairi⁴ (1.Graduate School of Science, Hokkaido University, 2.Faculty of Education, Niigata University, 3.International Research Institute of Disaster Science, Tohoku University, 4.Atmosphere and Ocean Research Institute, The University of Tokyo)

*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)