The contribution to the gravity from the Mars relief ( topography ) and the density jump at the Mohorovicic discontinuity ( { \bf M } ) in the quadratic approximation have been derived .
The problem of determination of possible depths of compensation for reliefs harmonics of different degree and order have been solved .
It is shown , that almost all compensation of a relief is carried out in a range of depths of 0-1400 km .
For various reliefs inhomogeneities the compensation is most probable at the depths corresponding to the upper crust ( \bar { d } = 4.5 \pm 3.7 km ) , to crust-mantle transition layer ( \bar { d } = 78 \pm 24 km ) ; to lithospheric boundary ( \bar { d } = 200 \pm 34 km ) ; to upper-mean mantle transition layer ( \bar { d } = 40070 km ) ; to mean-lower mantle transition layer ( \bar { d } = 1120 \pm 180 km ) .
The lateral distribution of compensation masses is determined of this depths , and maps are constructed .
The possible stresses in crust and mantle of Mars are evaluated .
They reach 10 ^ { 8 } Pa .
It is shown that relief anomalies of volcanic plateau Tharsis and symmetric formation in east hemisphere could arise and be supported dynamically by two plumes of melted mantle substance , enriched by fluids .
The plumes have their origins on the boundary depths of lower mantle .