In the probabilistic seismic‐hazard assessment (PSHA), one calculates the peak ground acceleration (PGA) (alternatively velocity, displacement, or intensity) at a given location that is expected not to be exceeded by a probability chosen by expert judgment (differing in different cases) and during a selected period. This is usually done by considering the influence of several seismogenic sources in the vicinity of a site. Here we consider the simple case in which one source capable of a large earthquake dominates the PGA calculation, a situation often encountered in practice.

The first parameter one needs to know for estimating the PGA is...

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