The dominant feature of the gravity field of the Western Carpathians is its significant decrease from the area of the East European Platform to the Outer and Central Carpathians and its increase in the direction of the Pannonian Basin. This course is connected with underthrusting of the European Plate under the Carpathian-Pannonian Plate, and its flexure as a result of the loading of its southernmost passive margin. The result of this is the existence of the foredeep basins of the Western Carpathians with significant thickness. According to the inclination of the subducted plate, the lithospheric models can be divided into two groups. In the first the inclination is large and in the second it is substantially smaller. The results of density modelling assume crustal shortening in the neo-Alpine development by only about 40–60 km. Shortening appears only in the narrow zone of the front of the overthrusting plate. In spite of the existence of the overthrust zones and local horizontal shortenings in the Carpathian-Pannonian Plate, it is possible to assume an extensional form of regional deformation. The difference in the process of continental convergence in time, but also space also confirms the density models. Differences of collision in the lower lithosphere are also evident. Profile 2T shows striking agreement of the continuation of the direction of the subduction of the European Plate, with the direction of deepening of the lithosphere-astenosphere boundary. It is possible that in this case, it is a relict of the southern continuation of the subduction zone to greater depths. However this fact is not observed on Profile 3T.