Sadigh et al. Attenuation

In this example, you can calculate several horizontal ground motion parameters at a site using attenuation relationships by Sadigh et al. The relationships for PGA, PGV, and PGD are from Sadigh and Egan, 1998, and the relationships for psuedospectral acceleration are from Sadigh, et al., 1997. Note that the site-to-fault distance is the closest distance to the rupture surface and the relationship is valid over the range of 0 to 100 km only. The valid range of magnitudes is 4 < Mw < 8. Links to tables of coefficients can be found in Appendix A. Interactive examples for all attenuation relationships can be found in Attenuate©.

Type of analysis:

Select the parameters you wish to use:

Fault Type:           Soil Conditions:

Site to fault distance (km):

Moment magnitude (Mw):

Period (s)
Ln median
median + s

PGA (g)

PGV (cm/s)
PGD (cm)
Sa (g)

modify spectrum
to Newmark and Hall spectrum generator

Copyright 1999 Janise Rodgers, Pacific Earthquake Engineering Research Center, University of California, Berkeley.