*Ching-Ying Tsou¹, Osamu Yokoyama², Fumitoshi Imaizumi³, Hsi-Hung Lin⁴, Yu-Chung Hsieh⁴, Mien-Ming Chen⁴, Masahiro Chigira⁵, Chun-Yi Wu⁶, Su-Chin Chen⁶ (1.Faculty of Agriculture and Life Science, Hirosaki University, 2.Japan Conservation Engineers Co., Ltd., 3.Faculty of Agriculture, Shizuoka University, 4.Central Geological Survey, Taiwan, 5.Disaster Prevention Research Institute, Kyoto University, 6.College of Agriculture and Natural Resources, National Chung Hsing University)