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Probabilistic Seismic Hazard Analyses (PSHA) \cite{cornell1968engineering,mcguire1995ez} produce estimates of the probability of exceeding various levels of ground motion (intensity measures) for a given location and time interval. The primary aims are to produce seismic hazard curves—usually drawn with the annual rates of exceedance on the vertical and increasing values of intensity measure (e.g. values of PGA) on the horizontal. Alternatively, time intervals of interest are selected (e.g. 500 years) in which case a map of expected values of the intensity measure can be made.   The standard PSH methodology estimates hazard by summing the contributions from all potentially damaging earthquakes in the region, the primary steps are as follows, e.g. (Baker, 2008): \cite{baker2008introduction}:  \begin{enumerate}  \item Define all earthquake sources capable of producing significant events.