1. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720-1710 (corresponding author).
2. Ph.D. Graduate Student Researcher, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720-1710.
3. Principal Engineer, Fugro Consultants, Inc., 1777 Botelho Dr., Suite 262, Walnut Creek, CA 94596.