It follows from the basic principles of mechanics of deformable solids relating to the strength, stability and propagation of elastic waves that the inner core of the Earth cannot exist in the form of a spherical structure in the assumed thermobaric conditions and calculation values of physico-mechanical parameters. Pressure level reaches a value that is significantly greater than the theoretical limit of medium strength in the model approximations at the surface of the sphere of the inner core. On the other hand, equilibrium state of the sphere is unstable by the geometric forming at much lower loads under the influence of the dead surface loads. In case of the action of follower loads, the assumed pressure value on the surface of the sphere is comparable with the value of the critical load of internal instability. In these cases, due to the instability of the equilibrium state, propagation of homogeneous deformations becomes uneven in the sphere. Moreover, the elastic waves with actual velocity cannot propagate in such conditions in solid medium. Violation of these fundamental conditions of mechanics needed in determining the physical and mechanical properties of the medium must be taken into account in the integrated interpretations of seismic and laboratory (experimental) data. In this situation, application of linear elasticity theory and elastic waves, despite compliance with the required integral conditions on the mass, moment of inertia and natural oscillations of the Earth, does not ensure the reliability of results on the structure and composition of the Earths core.
Practical significance. The obtained analytical dependences allow synthesizing the true values of the elastic parameters of the deformed media from seismic exploration and seismological dataset. The establishment of critical deformations for velocities of pressure and shear waves will make it possible to suggest differential criteria of the distribution of elastic parameters in theoretical models of the Earth in its various structural elements as a whole and separately.
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