Introduction. The "standing waves" method allows obtaining of high-precision information about the natural vibrations of dams and buildings of medium-pressure channel hydroelectric power plants, while taking into account the design features of structures in the planning of the observation system.

Methods. Based on the results of the study of the Irkutsk hydroelectric power station dam building by the standing wave method, the natural vibrations of the building on the longitudinal, transverse and vertical components were studied.

Results. Significant differences were established between the experimentally determined natural frequencies and the calculated ones, according to the model compiled during the commissioning of the hydroelectric power station. The block structure of natural vibrations of the building is shown. A unique result is the existence of two modes of vertical vibrations of the dam.

Conclusions. The studies performed are important for drawing up a passport for the hydraulic structure and for adjusting the calculation model.

According to the results of research on complex engineering objects, results were obtained that demonstrate significant deviations from the models of buildings and structures that are used as the basis for calculating seismic resistance and structural stability. Firstly, it is the existence of reflecting seismic oscillations of the boundaries inside the building, when standing waves form a common field for the building as a whole and a local field for a part of the object, secondly, a block structure of the object, when there are natural oscillations of different multiplicity with a different area of the object’s coverage, when some blocks independently oscillate, they unite into one system; thirdly, the existence of walls with double reflecting properties, which changes the field of standing waves; fourthly, the complex geometry of the object causes the fields of standing waves, It is described by two wave numbers. Experimental data show that in the theory of buildings it is necessary to move to the models of nested resonators, models of coupled resonators, and the verification of models should be entrusted to the standing wave method.

The use of a network of seismological stations allowed us to estimate the level of anthropogenic seismic impact on buildings and structures in Western Siberia. Considered induced seismicity at mining sites. It is shown that the number of manmade earthquakes is growing, and the largest energy has reached a destructive level. An assessment of the level of impact on the region of industrial explosions is given, methods for monitoring the seismic effect of industrial explosions are developed, and measures are proposed to ensure the reduction of the seismic effect of industrial explosions. It is shown that for low-seismic areas it is necessary to carry out the refinement of seismic hazard due to man-made factors.