1. Research Associate, Dept. of Geology and Geological Engineering, Hydrologic Science and Engineering, Colorado School of Mines, Golden, CO 80401.
2. Professor, Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401 (corresponding author).
3. Teaching Associate Professor, Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401.
4. Research Physical Scientist, Geologic Hazards Science Center, U.S. Geological Survey, Denver, CO 80225.