In this example,
you can calculate the peak horizontal ground acceleration or the psuedovelocity
spectrum at a site using the SEA96 attenuation relationship. This relationship
was developed specifically for extensional tectonic regimes, which exist in
the Basin and Range region of North America and in Western Europe.
Note that the site-to-fault distance is the closest horizontal distance to the vertical projection of the rupture and the relationship is valid over the range of 0 to 80 km only. The valid range of magnitudes is 5.5 < Mw < 7.5. Links to tables of coefficients can be found in Appendix A. Interactive examples for all attenuation relationships can be found in Attenuate©.