1. PhD Engineering, Associate Professor, Dept. of Civil and Environmental Engineering, Faculty of Engineering, Yamaguchi Univ., 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
2. PhD Engineering, Research Associate, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan.
3. PhD Engineering, Professor, Disaster Prevention Research Institute, Kyoto Univ. Gokasho, Uji, Kyoto 611-0011, Japan.