On the origin of the zone of lower seismic velocities of the Earth. Prediction of a similar zone on Mars at a depth of approximately 300 km

In light of the planned space missions to the Moon and Mars to study the inner structures of these celestial bodies by seismic methods, theoretical studies of possible peculiarities of the inner structures of these celestial bodies are particularly relevant. Our previous investigations showed that the mechanism of forced oscillations of the core and mantle of a celestial body under the gravitational influence of other celestial bodies may play a key role. Moreover, it allows a number of planetary processes and phenomena on the Earth and the other planets to be explained. Specifically, this mechanism gives us an opportunity to reveal geodesic changes and to study the nature and origin of some of the inner formations of the Earth, the Moon, and Mars. In the present paper, we explain the presence of a zone of lower seismic velocities (LVZ) on the Earth at a mean depth of approximately 145 km and predict the analogous LVZ on Mars at a depth of approximately 300 km.