The local geological conditions have a significant influence on seismic waves; these differences are referred to as the "local site effect," and they must be taken in consideration when estimating the seismic effects on buildings and urban planning. In fact, local conditions could affect the seismic shaking of an area and modify the seismic wave in terms of amplitude, frequency and duration. In this work the study area is the Friuli Venezia Giulia plain municipalities and the response spectra derived applying the AF values (both from abacuses and numerical simulations) have been compared to those obtained by the Italian Building regulation that apply the Eurocode 8 approach.
