[en] Probabilistic seismic hazard analysis (PSHA) provides a determination of the probability and its uncertainty, that specified levels of earthquake ground motion will be exceeded at a site in a future time period. Quantification of subjective interpretations of seismic sources, earthquake occurrence rates and maximum magnitude distributions are required. Structured procedures have been developed to accomplish these interpretations in a consistent manner. The methodology assures that uncertainty assessments reflect both knowledge and data limitations. Probabilistic seismic hazard results derived in this way can be deaggregated to determine seismic sources that dominate the hazard at a site and to provide an array of information to facilitate seismic design decision-making. (author)