Un modelo Gravimetrico 3-D para la corteza del NE de la península Ibérica

Abstract

Attention is focused on a three-dimensional model for the crustal structure of Catalonia (NE of the Iberian Peninsula). We combine different methodologies normally used separately in exploration geophysics to obtain the topographies of the Moho discontinuity and a crustal interface by separating their effects in the Bouguer anomaly map. The separation and isolation of the different components included in the Bouguer anomaly map were performed in the wavenumber domain by using the Spectral Factorization Method (SFM) (Spector and Grant, 1970). The three-dimensional model producing the different components o f the gravity anomaly map was estimated by separately inverting the corresponding domains of the power spectrum. The inversion method applied permitted us to obtain the three-dimensional Moho discontinuity and the three-dimensional top of the lower crust, which are consistent with the two-dimensional models for the area. The SFM seems to be a good tool for differentiating the different parts of the crust. There is a good correlation between the SFM depths and the upper and lower boundaries of the reflective area (layered lower crust) observed along the reflection seismic lines in the area