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.

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.