Toro, Abrahamson, and Schneider Attenuation

In this example, you can calculate peak ground acceleration and the psuedoacceleration spectrum at a site in eastern or central North America using attenuation relationships by Toro, Abrahamson, and Schneider, 1997. Note that the site-to-fault distance is closest horizontal distance to the vertical projection of the rupture and the relationship is valid over the range of 1 to 100 km only. The valid range of magnitudes is 5 < 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:


Site to fault distance (km):

Moment magnitude (Mw):

Period (s)
Ln median
median + s

PGA (g)

Sa (g)

modify spectrum
to attenuate©

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