*Kazuhiro KANAGAWA¹, Takayuki MUTO², Hidekazu TANAKA¹, Takayuki TANIGAWA³, Taku TAKEUCHI⁴ (1.ILTS, Hokkaido University, 2.Division of Liberal Arts, Kogakuin University, 3.School of Medicine, University of Occupational and Environmental Health, 4.Department of Earth and Planetary Sciences, Tokyo Institute of Technology)