Seismicity features of the caucasus in comparison with its tectonic structures

Abstract Various parameters of seismic field are considered for the Caucasian region. The most informative appeared to be the “sigma-Σ” parameter. A sketch map of the geotectonic zoning of the Caucasus is shown in which the σ parameter is represented by isolines for all periods under consideration. A comparative analysis of the values of the sigma-Σ parameter was conducted in each elemental area for three successive decades. Zones which are characterized by an unstable behaviour of the parameter can be distinguished.