Аннотация:The morphostructures and paleoseismicity of the southern slope of the Kungei Ala-Too Ridge(Northern Tien Shan) have been studied. It has been found that the main seismogenerating structures in theLate Pleistocene and Holocene were adyr (foothill) faults, that is, thrusts, strike-slips, and normal dips. Witha general thrusting of block folds of the basement southwards (toward the Issyk-Kul Basin), there are alsonorthward-moving underthrusts. The past seismic activity along the adyr faults is expressed by single seismogenicscarps, as well as by stair-like series of alluvial-proluvial and fluvioglacial surfaces, upthrown in thehanging walls of faults. In addition to the easily identifiable vertical component of slips along the faults, wehave also identified significant horizontal slips, which often greatly exceed the vertical ones. In addition, aunique structure, that is, a neotectonic ramp graben bounded from the south and north by oppositely directedthrusts, was studied on the slope of the Kungei Ridge. The mentioned faults were also studied by trenching.It was found that in the middle–second half of the Holocene three strong morphogenetic seismic eventsoccurred on the South Tegerek adyr fault and three strong earthquakes occurred on the North Tegerek one.The ages of four strong earthquakes were determined by the radiocarbon method. The maximum ages of thefirst three events are 3970–3755 BC, 220–405 AD, and 1380–1450 AD, while the minimum age of the lastevent is 1720–1815 AD. The magnitudes of historical and paleoearthquakes that occurred on the studied adyrfaults range from M = 6.6–6.9±0.5 (South Tegerek fault) to M = 6.8–7.4 ± 0.5 (Kultor adyr fault). Seismicevents of similar magnitudes lead to deformations of the earth’s surface and in building structures, which canbe estimated on a macroseismic scale at I ≥ IX. Our data obtained in this study can be used for a comparativeanalysis of similar post-platform orogens in Russia (e.g., Altay and Sayan mountains), as well as in compilingthe new general seismic zoning map for the Kyrgyz Republic.
