ABSTRACT
Romania has one of the highest levels of seismic hazard among the European countries. Its seismicity comprises several crustal seismic sources in the central and eastern part, as well as the active Vrancea intermediate-depth seismic source. In this study, a tentative proposal for a new seismic zonation in Romania, in line with a future revision of EN 1998-1 is shown. The site classification is based essentially on the fundamental site period T0 obtained from horizontal-to-vertical spectral ratio of ground motion recordings from seismic events with moment magnitudes MW ≤ 6.0. The results show that the site classification based on the fundamental site period T0 offers information which is well corelated with the local geology and in some cases is correlated with measured data (two cases in Bucharest and Constanta). The analyses show that the largest control periods TC occur at sites situated towards the southern part of Romania, while the largest values of spectral accelerations are obtained for sites in the vicinity of the Vrancea intermediate-depth seismic source.
