This paper presents the detailed analysis of the geological-geotechnical conditions of a sector of the southern high and middle plains of western Cuba, as a basis for the characterization and evaluation of the effect of site and, consequently, the identification of the different levels of seismic susceptibility in the San Cristobal town. Seismic activity in this region is mainly associated to the regional dynamics of the active left-lateral strike-slip fault Pinar. Earthquakes in the area are characterized by moderate to weak magnitude, shallow focus and a low frequency. The methodology consisted of 3 tasks: (1) elaboration of the geological-geotechnical map, (2) zonation in terms of dominant period, and (3) estimate of the variation of macroseismic intensity (∆I). The present lithologic groups were characterized according to their power, S wave velocity, value-N standard penetration test and the natural density of materials. Zonation is proposed in six classes, according to the dominant period of their materials; also were estimated for each class (∆I). The recent alluvial lithologic group and alluvial marine group of Pliocene-lower Pleistocene, with thicknesses greater than 30 m, have the highest capacity of seismic amplification in the area.
