Aportaciones de la prospección geofísica al estudio del subsuelo del Berguedà y Solsonés. (pre-Pirineo Catalán, N.E. de la Península Ibérica)

Abstract

A combined gravity and seismic study of a sector located in the limit of the Pre-Pyrenees and Catalonian Central Depresión structural units is presented. Two sets of geophysical data are used: gravity and seismic reflection, which are complementary since one detects subhorizontal limits while the other serves to locate heterogeneous density masses. To emphasize the local gravity anomalies, a residual map was obtained by removing the regional field, which is best represented by a second order trend surface. The most prominent features of this map are the gravity lows aligned over anticline structures. Gravity modelling constrained by seismic reflexion data reveals the existence of a low density plastic marls tectonically acumulated on the nucleus of the anticlines.