1. Assistant Professor, Dept. of Civil and Environmental Engineering, Tufts Univ., 113 Anderson Hall, Medford, MA 02155.
2. Senior Engineer, Haley & Aldrich, 465 Medford St., Suite 2200, Boston, MA 02129.
3. Graduate Student, Dept. of Earth and Planetary Sciences, Harvard Univ., 20 Oxford St., Cambridge, MA; formerly, William Lettis and Associates, Inc., 1770 Botelho Dr., Suite 262, Walnut Creek, CA 94596.