1. Associate Professor, Hunan Univ., Changsha, China; formerly, Research Fellow, Natural Hazards Research Center, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798.
2. Director, Natural Hazards Research Center, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798 (corresponding author).
3. Ph.D. Candidate, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798.