Abstract
—The results of the frequency analysis of seismoacoustic elastic waves radiated from the loaded rock sample source models and of rock bursts records are presented. For both categories of study the fundamental symptoms of nonlinear processes in seismic foci were found and demonstrated. Namely, the wave-field modulation (satellites in the spectra), forced synchronisation (spectra simplification and their transformation into a narrow spectral band), frequency shift to lower values and, finally, coherency of radiation. A new method of amplitude-phase distribution is worked out. All this indicates that nonlinear processes can participate in a seismic source during the energy release. Also, the disagreement between the source sizes observed in the nature and computed by means of linear physics, can be explained by self-organising processes.
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