"The paper discusses the results of a comparison of calculation of seismic intensity based on the integer and fractional values of initial seismicity in detailed seismic zoning (DSZ) and seismic microzonation (SMZ), as well as design of corresponding seismic hazard maps in values of peak ground acceleration (PGA). It is shown that, despite the fact that SMZ maps were designed using different approaches (with their own features), results are generally the same. And as always — non formal.

Existing methods of underground mining design are not including special parameters for account of possible seismic events that cause additional dynamic effects on the elements of rock mass. Traditionally it is assumed that stability of underground structures on seismic effects is sufficiently large compared with terrestrial objects. Nevertheless, seismic effects may contribute to the loss of reserves due to dilution, and works at depth are of high risk here and even a minor factor is important. Calculations of stressed state of mining system at dynamical impacts is performed and seismic coefficient for safety factor assurance is proposed.

In connection with activation of hazardous natural processes in the Caucasus and, in particular, the descent of the Kolka glacier (on the 20th of September 2002) the Republic’s existing seismic observation network was transformed into the network of integrated observations “The Karmadon paramentric range”. The aim of the network operation is studies of natural and technogenic hazardous geological processes in mountain regions.

The results of seismic microzoning of the territory of Vladikavkaz City held in 2011 are considered. Basing on the results of detailed seismic zoning and macroseismic investigation of the past earthquakes the reference soil (the average ground conditions) in the form of unsaturated clayey soils of medium-hard consistency was determined. The initial intensity (seismicity) of the territory equal to 8 points is attributed to this soil. The intensity increments for sites with typical soil conditions were estimated by means of instrumental, analytical and instrumental-analytical methods of seismic microzoning. The corresponding seismic microzoning map of Vladikavkaz in terms of macroseismic intensity units in the scale of 1:10000 was created.