1. Research Professor, Sol Price School of Public Policy, and Faculty Affiliate, Center for Risk and Economic Analysis of Terrorism Events (CREATE), Univ. of Southern California, 230 RGL, 650 Childs Way, Los Angeles, CA 90089.
2. Associate Professor, Dept. of Earth and Environment, Boston Univ., 675 Commonwealth Ave., Boston, MA 02215.
3. Research Assistant Professor, Sol Price School of Public Policy, and Faculty Affiliate, Center for Risk and Economic Analysis of Terrorism Events (CREATE), Univ. of Southern California, 100D University Gateway, Los Angeles, CA 90089 (corresponding author).
4. Operations Research Analyst, Western Geographic Science Center, U.S. Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025.