Boore, Joyner and Fumal Attenuation

In this example, you can calculate the peak horizontal ground acceleration or the psuedoacceleration spectrum at a site using Joyner, Boore and Fumal's attenuation relationship. Note that the site-to-fault distance is the closest distance to the surface projection of the rupture plane 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. The recommended shear-wave velocity (Vs) values given in the notes are used in this example. If you wish to use a different value of Vs, select Custom from the Soil Conditions menu.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)

Sa (g)

modify spectrum
to attenuate©

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