Abrahamson & Silva Attenuation

In this example, you can calculate peak ground acceleration and the psuedoacceleration spectrum at a site using attenuation relationships by Abrahamson and Silva, 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 on Hanging Wall:

Site to fault distance (km):

Moment magnitude (Mw):

Period (s)
Ln median
median + s

PGA H (g)

PGA V (g)
Sa H (g)
Sa V (g)

to class notes

modify spectrum
to Newmark and Hall spectrum generator

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