Sargsyan Heghine - The chief seismolog of northern Department of the National Survey for Seismic Protection (NDNSSP), Leningradian str. ۵a, ۳۷۷۵۰۰, Gyumri, Republic of Armenia
Gasparyan Vigen - Teh scientific cooperater northern Department of the National Survey for Seismic Protection (NDNSSP), Leningradian str. ۵a, ۳۷۷۵۰۰, Gyumri, Republic of Armenia

The complex geological structure of Tavro-Caucasian region consisting of blocks and megablocks of various significance and their interaction under the tectonic strains brings to appropriate manifestations of seismic field, on dynamics, change of seismic activity, on the velocity of volumetric (longitudinal andtransversal) waves’ propagation and recurrence of weak earthquakes during preparation of strong ones.The data on earthquakes of Caucasus are inhomogeneous. With the development of the network of seismological observations in Caucasus the representability of earthquakes’ registration changed, therefore our researches were divided into stages. Are studied strong earthquakes with М>5,0 of Caucasus with aftershock manifestation, and for the territory of Armenian plateau with М> 4. Before the strong earthquakes were observed various anomalous variations in space-time distribution of more weak earthquakes