Peak ground acceleration, velocity and displacement from moderate magnitude undercrustal earthquakes of Vrancea region

摘要

The goal of the study is to analyze the distributions of peak groundacceleration, velocity and displacement from 18 moderate size undercrustal earthquakes(Mw 4.0-5.0), which occurred in the Vrancea region during the period 2008"010. Thepatterns of the investigated ground motion parameters keep the general featuresobserved for the strong Vrancea earthquakes "a rapid decrease of the ground shakingin SE-NW direction, and a prominent asymmetry of the isolines. The variability noticedamong the individual distributions appears as a result of the combined effects of thehypocenter location within the seismogenic zone (focal depth and epicenter position)and diversity of the focal mechanisms.