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Evaluation of Embankment and Foundation Liquefaction Potential. Papillion Creek and Tributaries Lakes, Nebraska, Damsites 11 and 16. Seismic Evaluation.
CORPS OF ENGINEERS OMAHA NE
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The determination of maximum acceleration for the sites was based on the procedure developed by Cornell 1968. Seismotectonic zones were delineated in the study area based on known and inferred geologic structures. These seismotectonic zones were divided into point, line, and area sources for earthquakes. The earthquake record was used to develop magnitude-frequency relationships, in order to determine the magnitude of the earthquake with a 0.001 annual recurrence. This magnitude and frequency were used on the various sources in a combined probabilisitc-deterministic analysis. This type of analysis is preferred for the Papillion Creek sites, due to the short seismic record and the lack of faulting evident at the surface. The computed factors of safety against liquefaction for Papillion Creek Damsites 11 and 16 exceed evaluation criteria required for seismic stability. Based on this evaluation, Papillion Creek Damsites 11 and 16 are considered seismically stable for postulated earthquake conditions.
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