Abstract: The NDSHA procedure provides strong ground motion parameters based on the seismic wave propagation modelling at different scales-regional, national and metropolitan accounting for a wide set of possible seismic sources and for the available information about structural models. The scenario-based methodology relies on observable data and is complemented by physical modelling techniques which can be submitted to a formalized validation process. The combination of NDSHA and other alternatives is a must to obtain reliable results concerning the safety of our society. Earth crust model were performed for the purpose of defining the parameters of the geological media that have local effect upon the variation of the regional seismic motions such are: thickness H, values of seismic Vp and Vs velocities and the surface amplification layers p s the quaternary deposit and the surface loose layers of Neogene sediments and older geological rocks.