Density modeling of the south-eastern part of the Fennoscandian shield using GIS Integro

When studying the deep structure of the southeastern part of the Fennoscandian shield, maps of the topography of the Moho surface were clarified. The depths of this surface on maps and sections of GSS profiles were compared. Discrepancies (up to 8 km) were taken into account in the construction of the consolidated map. To correct the position of this surface in the space between seismic profiles, an approach using the analysis of 3D distribution of density inhomogeneities in the earth’s crust and upper mantle.

The results of 3D density modeling for a two-layer model (earth’s crust-upper mantle) made it possible to determine the position of large blocks with different density in both of the layers.

2D inverse gravitatione problem solution in block model along the seismic profile of the Baltic sea under the assumption of lateral heterogeneity of the mantle made it possible to obtain more realistic densities for the lower crust of the Svekofennian folded area and for the upper crust of the Karelian block.