1. C. Synolakis is in the Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA.
2. P. Liu is in the School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853-3501, USA.
3. G. Carrier is in the Department of Earth and Atmospheric Sciences, Harvard University, Cambridge, MA 20138, USA.
4. H. Yeh is in the Department of Civil Engineering, University of Washington, Seattle, WA 98195, USA.