Inclusion of site-effects: An approach coherent with contemporary event-based PSHA practices

Contemporary probabilistic seismic hazard analysis (PSHA) is performed using an event-based approach, and that has motivated the review of the methods to consider site-effects within that analysis framework. Shortly after the classic proposal of PSHA, that only aimed at estimating ground motion levels for rock conditions, different ways to estimate the modifications of the amplitude at surface level because of soft soils were developed. To date, different approaches have been proposed, although they seem to be better suited for convolution-based PSHA, where the numerical integration of analytical functions is performed. This paper presents a proposal to consider site-effects within an event-based PSHA framework, and compares the obtained results with those of two commonly used methods. Different sensitivity tests related to variations of assumptions of the model are shown, in order to facilitate understanding the results.