PEER has just published Report No. 2015/06 titled “Adjusting Ground-Motion Intensity Measures to a Reference Site for which V(S30) = 3000 m/sec” as a new addition to the PEER Report Series. It was authored by David M. Boore.
Adjustment factors that can used to convert ground-motion intensity measures at sites with V(S30)=760 m/sec and V(S30)=2000 m/sec to a reference rock site, defined as one with V(S30)=3000 m/sec, are provided as tables: (1) for moment magnitudes from 2 to 8; (2) rupture distances from 2 km to 1200 km; (3) response spectra at periods from 0.01 sec to 10.0 sec; and (4) peak acceleration and peak velocity. Ten velocity models used in ground-motion studies in central and eastern North America with V(S30) values very close to 760 m/sec were considered, and adjustment factors are provided for two of those models that effectively span the range of models; in addition, for the convenience of the user, adjustment factors are provide for an average of a representative set of models with V(S30)=760 m/sec. For models with this velocity, adjustment factors are provided for four values of the diminution parameter kappa , ranging from 0.005 sec to 0.030 sec. The adjustment factors are based on stochastic-method simulations of ground motion.