Speaker
Description
Based on the Catalog of earthquakes in Central Asia 1887-2007 (Comprehensive Nuclear-Test-Ban Treaty Organization's National Data Centre of Kazakhstan), a study of seismicity in the Tien Shan was carried out. The epicenters of the strongest earthquakes M≥6.7≥8.4 outline the Tien Shan block parallel to the northern shore of Lake Issyk-Kul. Parallel to the southern shore of Lake Issyk-Kul earthquakes of M=5.6÷6.6 were observed. Strong earthquakes M=6.5÷7.0 are observed on the North and South Fergana faults. Parallel to the southern shore of Lake Issyk-Kul, the following earthquakes are observed: M=5.6÷6.6: Isfara-Batkent 1977, M=6.3; Kairakkum 1985, M=6.3; Kochkorata 1992, M=6.3; Nura 2007, M=6.0. The Punjab indenter is contoured by earthquakes accumulation zone M=5.0÷5.5. The development of CTBTO opens up wide opportunities in the study of seismicity. Statistical studies of the distribution of types of movements in the earthquake's sources 3.0≤M≤5.0 according to the mechanism of earthquake source in the zones of North and South Fergana faults have shown that more than 60% of movements have a reverse fault character with a shift or thrust components. This conclusion corresponds to geological estimates of the displacement of the North Fergana fault to the west and does not contradict geological estimates of the morphology South Fergana fault zone in the Fergana depression.
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