Luke McGuire, University of Arizona, Department of Geosciences, Tucson, AZ, United States, Francis K Rengers, U.S. Geological Survey, Geologic Hazards Science Center, Golden, CO, United States and Hui Tang, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 4.7 Earth Surface Process Modelling, Potsdam, Germany