2 research outputs found
Regional groundâmotion prediction equations for amplitudeâ, frequency responseâ, and durationâbased parameters for Greece
Although all of the main properties of a ground motion cannot be captured through a single parameter, a number of different engineering parameters has been proposed that are able to reflect either one or more groundâmotion characteristics concurrently. For many of these parameters, especially regarding Greece, there are relatively few or no predictive models. In this context, we present a set of new regionallyâcalibrated equations for the prediction of the geometric mean of the horizontal components of 10 amplitudeâ, frequency responseâ, and durationâbased parameters for shallow crustal earthquakes. These equations supersede previous empirical relationships for Greece since their applicability range for magnitude, and epicentral distance has been extended down to Mw 4 and up to 200 km, respectively, the incorporation of a term accounting for anelastic attenuation has been investigated, while their development was based on a groundâmotion dataset spanning from 1973 to 2014. For all groundâmotion parameters, we provide alternative optimal equations relative to the availability of information on the different explanatory variables. In all velocityâbased and contrary to the accelerationâbased parameters, the anelastic attenuation coefficient was found statistically insignificant when it was combined with the geometric decay and the coefficient accounting for saturation with distance. In the regressions where the geometric decay coefficient simultaneously incorporated the contribution of anelastic attenuation, its increase was found to be much less considerable in the velocityâbased than in the accelerationâbased parameters, implying a stronger effect of anelastic attenuation on the parameters that are defined via the acceleration time history