2D Gravimetric Models of the Cariaco Sedimentary Basin

Modelos Gravimétricos 2D de da Cuenca Sedimentaria de Cariaco

Abstract

A set of 2D gravimetric models of the city of Cariaco was made, with the objetive of describing the structure and geometry of the basin at a regional scale and thus contribute to the seismic microzoning studies of the region. The Bouguer anomaly database used integrates terrestrial and satellite information with a resolution of 0.01°×0.01°, the regional and residual separation was obtained by an analytical continuation 200 m upwards and the profiles were drawn on the residual map of the Bouguer anomaly. In the residual map it could be observed that the contours that include the lowest values of the Bouguer anomaly have a trend that varies from EO to SO-NE, which corresponds to the extension of the sedimentary cover, while the thicknesses determined by the models 2D vary between 60 m and 270 m. The thicknesses between 200 m and 270 m represent the depocenter of the basin, which also coincides with the town of Cariaco, the thickness of the sediments maintains a downward trend towards the east and west, while, to the north and south, the basin is located bounded by the Araya - Paria mountain range and the Falla El Pilar.