Michiko Shigefuji, Kyushu University, Fukuoka, Japan, Nobuo Takai, Hokkaido University Faculty of Engineering, Sapporo, Japan, Subeg Bijukchhen, Khwopa Engineering College, Bhaktapur, Nepal, Masayoshi Ichiyanagi, Institute of Seismology and Volcanology, Hokkaido University, Sapporo, Japan and Tsutomu Sasatani, Hokkaido University, Sapporo, Japan