We study changes in the properties of the geologic environment in the vicinity of a stationary 40-ton vibration source in time intervals between vibration sessions. The relationship between the estimated amount of energy released by the environment over time and the frequency of the amplitude spectrum was determined experimentally. We introduced a parameter (α) that characterizes this relationship and determined that its absolute value increases linearly in the time intervals between operations of the vibration source in field observations. It is hypothesized that there are zones that have the property to change rapidly their stress state by both accumulating and releasing energy. Comparative analysis of the stress state of the area of the experiment showed significant differences in the spatial distribution of the gradient of the new parameter (β) before and after active low-frequency effects on the environment.

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