The submitted work presents density and geothermal modelling in profiles KP-l, KP-II, KP-III and KP-IV. At the same time it deals with mathematical modelling of stress field in profile KP-III. This modelling has proved that the Carpathian gravity low results from combined effects of low-density Flysch Belt as well as Foredeep rocks, granitoids and crystalline schist complexes piled up in the northern Inner Carpathians as a result of their nappe structure. From a regional point of view, geothermal activity declines from the inner units of the Western Carpathians to the outer ones, whereas the share of Earth's crust radiogenic heat sources in the surface heat flow drops in the opposite direction. Mathematical modelling of the stress field has revealed that in the northern tract of the Inner Carpathians the field is of compressional character, where as in the southern one the stress field is dilatational.