1. Lecturer, Mansoura Univ., Mansoura, Dakahlia Governorate 35516, Egypt (corresponding author).
2. Institute Professor, Dept. of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, 110 8th St., JEC 4049, Troy, NY 12180.
3. Iovino Chair Professor, Dept. of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, 110 8th St., JEC 4049, Troy, NY 12180.
4. Research Seismologist, Earth Research Institute, UC Santa Barbara, 6710 Ellison Hall, Santa Barbara, CA 93106-1100.