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To illustrate methods for incorporating uncertainty into seismic-hazard analyses, we describe the characterization of earthquake sources used in a seismic-hazard analysis for a site in western Washington. A simple and effective tool for incorporating uncertainty into seismic-hazard analysis is called a logic tree; one was used in this study to include the range of possible characteristics of the Cascadia subduction zone seismic sources. At present, considerable uncertainty exists regarding the earthquake potential of the Cascadia zone, particularly due to the completely aseismic nature of the interface between the Juan de Fuca and North America plates. A key issue is...

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