The authors discuss possible causes of the variable polyrhythmicity of processes in nature and society, particularly in geophysics. It may be caused by desynchronization or resynchronization of processes that manifest themselves as a result of a shock impact on the geological environment, for example, in the form of an earthquake. Medical parameters are considered for which de- and resynchronization of rhythmic processes in the human organism are known, as well as geophysical processes, including underground noise of tidal origin and the seismicity of the Moon