Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabudare cities in order to determine the physical properties and the sedimentary thickness of the alluvial terrace of Barquisimeto and the Cabudare pull-apart basin. Sediment thickness in Barquisimeto and Cabudare cities was obtained from 3D gravimetric modelling, considering local geology, previous gravimetric models and sedimentary thickness estimated from H/V relation, boreholes and seismic refraction data. We used residual anomaly values as 3D gravity model input data. Data and results, which are fundamental input for calculating soil dynamic responses and the definition of microzones of similar seismic response in both cities, were integrated in a geographic information system (GIS).