David M. Boore Emel Seyhan Gail M. Atkinson Jonathan P. Stewart 2016 <p><span>We present ground motion prediction equations (GMPEs) for computing natural log means and standard deviations of vertical-component intensity measures (IMs) for shallow crustal earthquakes in active tectonic regions. The equations were derived from a global database with </span><strong>M</strong><span> 3.0–7.9 events. The functions are similar to those for our horizontal GMPEs. We derive equations for the primary </span><strong>M</strong><span>- and distance-dependence of peak acceleration, peak velocity, and 5%-damped pseudo-spectral accelerations at oscillator periods between 0.01–10 s. We observe pronounced </span><strong>M</strong><span>-dependent geometric spreading and region-dependent anelastic attenuation for high-frequency IMs. We do not observe significant region-dependence in site amplification. Aleatory uncertainty is found to decrease with increasing magnitude; within-event variability is independent of distance. Compared to our horizontal-component GMPEs, attenuation rates are broadly comparable (somewhat slower geometric spreading, faster apparent anelastic attenuation), </span><i>V_S</i>₃₀<span>-scaling is reduced, nonlinear site response is much weaker, within-event variability is comparable, and between-event variability is greater.</span></p> application/pdf 10.1193/072114EQS116M en Earthquake Engineering Research Institute NGA-West2 equations for predicting vertical-component PGA, PGV, and 5%-damped PSA from shallow crustal earthquakes article