The analysis of the ground foundation must take into consideration two main aspects: a simulation of the ground motion as close as possible to reality and the correlation of the ground motion with existing geological conditions. Thus, it can be distinguished two main functions of the soils: the function of a dynamic filter for the seismic movement that come from the source, and the function of a deformable spring for the buildings whose support is. In this paper, the behavior of a site was

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... zed from the site response point of view, using different accelerograms of Romanian's earthquake. These accelerograms were recorded during the 1977, 1986 and 1990 earthquakes. In order to perform equivalent linear site response analysis we use the STRATA software for a homogeneous soil layer with more than 10 meters depth. The soil type and the velocity layering were considered constant on the entire soil deposit. The analysis was done both on cohesive and cohesionless soils. The final results have been mapped in terms of soil dynamic characteristics, accelerograms and acceleration response spectrum, under different earthquake excitations.