The physically based seismic hazard analysis is probably the most advanced analysis, computationally, compared to the others described in this book. For this reason, although this method also accounts for seismic hazard analysis like those explained in Chap. 5 , it is described separately. This method follows the same procedures as the seismic hazard analyses, with only one main difference: the attenuation equations are not used, and they are replaced by empirical Green’s functions to estimate the spatial soil displacement along the wave path.