1. Senior Engineer, Civil Practice, Exponent, Inc., 475 14th St., Ste. 400, Oakland, CA 94612 (corresponding author).
2. Hall Endowed Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
3. Senior Modeler, Model Development, Risk Management Solutions, Inc., 7575 Gateway Blvd., Newark, CA 94560.
4. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
5. Professor and Chair, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA 90095.