HALLET, Bernard, Earth & Space Sciences and Quaternary Research Center, University of Washington, Box 351310, 365 Johnson Hall, Seattle, WA 98195, hallet@u.washington.edu, MACKENZIE-HELNWEIN, Peter, Civil & Environmental Engineering, University of Washington, Seattle, WA 98195, SHI, Jian, Department of Civil & Environmental Engineerinr, University of Washington, Seattle, WA 98195, and EPPES, Martha Cary, Department of Geography & Earth Sciences, University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223