Affiliation: | Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan. E-mail:;, National Research Institute for Earth Science and Disaster Prevention, Tennodai 3-1, Tsukuba, Ibaraki 305-0006, Japan,; Nippo Co. Ltd, 1-8-7, Kodai, Miyamae-ku, Kawasaki 216, Japan,; Nikken Gijutsu Consultants Co., 6-4-3 Tanimachi, Chuo-ku, Osaka 542-0012, Japan |