1. University of Chile, Beaucheff 883, Santiago, Chile
2. Dept. of Civil and Env. Engrg., UC Berkeley, Berkeley, CA 94720-1710
3. School of Civil and Env. Engrg, Georgia Institute of Technology, Atlanta, GA 30332-0355
4. Golder Associates, Santiago, Chile
5. University of Illinois at Urbana-Champaign, 205 N. Mathews Ave. Urbana, IL 61801
6. Prototype Engineering, Inc.