1. Assistant Professor, Dept. of Civil Engineering, Indian Institute of Technology, Madras India and Room 225, Building Sciences Block (BSB), Dept. of Civil Engineering, IIT-Madras, Chennai 600036, Tamil Nadu (State), India (corresponding author). E-mail: gandalf@stanfordalumni.org
2. Professor, Dept. of Civil and Environmental Engineering, Stanford Univ.; Room 290, Terman Engineering Building, 380 Panama Mall, Stanford, CA 94305-4020. E-mail: Ray.Levitt@stanford.edu