1. Staff Engineer II, Fugro West Consultants, 4820 McGrath Street, Ste. 100, Ventura, CA 93003.
2. Professor and Vice Chair, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, 5731 Boelter Hall, Los Angeles, CA 90095 (corresponding author).
3. Senior Engineer, Geomatrix Consultants, 510 Superior Ave., Ste. 200, Newport Beach, CA 92663.
4. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, 5731 Boelter Hall, Los Angeles, CA 90095.