Adjustment factors that can used to convert ground-motion intensity measures at sites with VS30=760 m/sec and VS30=2000 m/sec to a reference rock site, defined as one with VS30=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 VS30 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 VS30=760 m/sec. For models with this velocity, adjustment factors are provided for four values of the diminution parameter κ , ranging from 0.005 sec to 0.030 sec. The adjustment factors are based on stochastic-method simulations of ground motion.
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