2D numerical modelling of seismic site effects in San Severino Marche

In the present paper, the results of 2D numerical analyses of seismic site effects at San Severino Marche (Macerata-Italy) are presented and discussed. The main purpose was to investigate the 2D effects due either to superficial or buried morphology, by comparing the results from two-dimensional analyses on two cross sections with those obtained in one-dimensional conditions. Site conditions, including morphological, stratigraphic and geotechnical subsoil characterization from geological-geotechnical survey are described in the first part of the paper. In the second part, the results of the 2D Local Seismic Response (LSR) analyses are given and commented. A large number of vertical soil profiles along the selected cross-sections were analyzed by means of 1D numerical modelling and different kind of amplification factors were computed with reference to peak ground accelerations and elastic response spectra to evaluate both topographic and basin-edge effects.