SOME REGULARITIES OF SEISMICITY OF CENTRAL AND WESTERN UZBEKISTAN
Abstract
In article, distribution of space-temporal seismic activity of Western Tien-Shan region was considered. Two groups of strong earthquakes in Western and Central Uzbekistan were extracted. Regularity has been detected on redistribution of the accumulated tectonic energy in the form of seismicity alternatively on the regions. It was shown that earthquakes on hypocenters’ depths were distributed in certain seismogenic layers independent from their magnitude level. Deflections were discovered from the regularity of grouping of strong earthquakes in seismic regime of the region. Probably natural and technogenic triggers preceded the triple strong Gazly earthquakes in 1976 and 1984 with М=7,0–7.3. Natural triggers: active processes of fissures on the north Gazly with length ~ 100 km near Tamdibulak and absence for more than 40 years of appreciable earthquakes in epicentral region Gazly. Technogenic triggers: constant 40-years-long gas pump from “Gazly” fields and two nuclear explosions implemented near Gazly earthquakes in 1976 and 1984 of tectonic nature.