Gravity anomalies in the Earth's crust and upper mantle

The contribution to the Earth external and internal gravity field from isostatically equilibrated masses of relief, density jumps on Moho boundary and anomalous masses of crust and upper mantle of the Earth in linear and quadratic approximation is found. Significant gravity anomalies are revealed in isostatically equilibrated crust and mantle, which can lead to gravitational and dynamic instability. The deviation of the external field of the Earth in isostatic equilibrium from observations demonstrates the disturbance of isostatic equilibrium in Earth.