Density inhomogeneities of the Earth's mantle and core

Lateral density variations are determined at depth and are characterized by the anomalies of the seismic waves velocities, which are consistent with both the anomalies of the external gravity field and with the data from the analysis of Earth's free-oscillation minimizing the deviations of the internal Earth structure from a hydrostatically equilibrated structure. It is shown that the obtained anomalous structures cause anomalies of the gravity field inside the Earth, which may be conducive to convective movements in the mantle and core.