Abstract
Regional scale liquefaction assessments are currently performed using approaches such as qualitative liquefaction susceptibility rankings based on mapped geology and groundwater information, interpolation of liquefaction vulnerability indices from widely spaced subsurface explorations, or use of proxies for geologic, geotechnical, and groundwater conditions that affect liquefaction triggering calculations. These methods often do not include assessments of the consequences of liquefaction, such as the potential lateral spread displacement and its uncertainty. This study presents a procedure for probabilistically assessing liquefaction-induced lateral spread displacement at the regional scale by estimating a distribution of lateral displacement index (LDI) using models conditioned on surficial geology, depth to groundwater, peak ground acceleration, and earthquake magnitude. Existing topographic correlations are used to convert distributions of LDI to distributions of lateral spread displacement. Case histories illustrate its performance in regional assessments of the lateral spread hazard.
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