A chain of theoretical concepts of the seismic process is constructed based on experimental results of the destruction of the solid sample under uniaxial compression obtained by G.A. Sobolev. These concepts satisfy the fractal principle and make it possible to specify calculation operations with parameters of the natural seismicity. Seismological data on aftershocks of the Racha earthquake of 1991 is processed using new procedures. As a result, the spatial structure of the focus has been specified, which makes it possible to construct detailed models of its potential.