Purpose. The aim of the paper is to calculate and analyze the azimuth coefficients qi for velocity of seismic waves propagation in real media in the three upper layers which fit the source depth of local earthquakes in the Transcarpathian seismic active region. Methodology. In order to calculate the value of x a problem of finding the point of boundary intersection of the first layer by a P-wave for double-layer medium (similar calculations can be made for the S-wave) is solved and an equation of the fourth degree is obtained. To calculate the value of x for three layered medium is used the so-called method "Chinese Tower", the first and second layers are combined in one which has the effective velocity of the P-wave v*2a with further solving the two layers problem. Results. In paper, the implementation of azimuthal coefficient qi is justified, which is used in a learning sample of neural network as a parameter accounting for the direction of wave propagation in a real medium. The average values of azimuthal coefficient qi have been determined for the respective sectors with its similar values for a single, two- and three-layered medium. The application of azimuthal coefficient in the analysis of the medium parameters has been demonstrated. Originality. First introduced azimuthal factor qi to specify the velocity of seismic waves from different directions in the first, second and third layers of Transcarpathian seismic active region and using the azimuthal factor to analyze parameters of the real medium. Practical significance. Based on the obtained solutions the methodology and algorithms are developed and can be used in research and industrial institutions in the study of processes in the earthquake, modelling and analysis of local earthquakes, to clarify the velocity distribution of direct P- and S- waves for seismic events in Transcarpathian region recorded by seismic stations and other problems of modern seismology.
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