[1] Shimane Univ, Interdisciplinary Fac Sci & Engn, Dept Earth Sci, 1060 Nishikawatsu Cho, Matsue, Shimane 6908504, Japan
[2] Shimane Univ, Inst Environm Syst Sci, 1060 Nishikawatsu Cho, Matsue, Shimane 6908504, Japan
[3] Shimane Univ, Ctr Nat Disaster Reduct Res & Educ, 1060 Nishikawatsu Cho, Matsue, Shimane 6908504, Japan