Campbell
Attenuation

In this example, you can calculate vertical and horizontal peak ground acceleration, velocity and the pseudoacceleration spectrum at a site using attenuation relationships by Campbell, 1997. Note that the sitetofault distance is the closest distance to the seismogenic rupture zone and the relationship is valid over the range of 0 to 100 km only. The valid range of magnitudes is 4 < Mw < 9.5, roughly. Links to tables of coefficients can be found in Appendix A. Interactive examples for all attenuation relationships can be found in Attenuate©.