*Sung-Ho Suh¹, Masayuki Maki², Masato Iguchi³, Dong-In Lee¹ (1.Division of Earth Environmental System Science, Pukyong National University, Korea, 2.Research and Education Center for Natural Hazards, Kagoshima University, Korimoto, Kagoshima, Japan, 3.Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University, Sakurajima, Kagoshima, Japan)