1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, 5732E Boelter Hall, Los Angeles, CA 90095 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, Stanford Univ., The Blume Center, 439 Panama Mall, Bldg. 540 Room 118, Stanford CA 94305.
3. President, Mar Structural Design, 2629 7th St., Berkeley, CA, 94710.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, 733 Davis Hall, Berkeley, CA 94720.
5. Chief Operating Officer, GeoHazards International, 687 Bay Rd., Menlo Park, CA 94025.
6. Postdoctoral Scholar, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, 760 Davis Hall, Berkeley, CA 94720.