TY - JOUR

T1 - Active tectonics and paleoseismicity of the eastern issyk-kul basin (Kyrgyzstan, Tien Shan)

AU - Korzhenkov, A. M.

AU - Deev, E. V.

AU - Turova, I. V.

AU - Abdieva, S. V.

AU - Ivanov, S. S.

AU - Liu, J.

AU - Mažeika, I. V.

AU - Rogozhin, E. A.

AU - Strelnikov, A. A.

AU - Fortuna, A. B.

AU - Usmanova, M. T.

N1 - Funding Information: The study was supported by the Russian Foundation for Basic Research (Projects 19-55-53017_GFEN_a, 18-55-41005_Uzb_t) and grant G-2153 of the International Research Center. It was carried out as part of the State Research Program at the O.Yu. Schmidt Institute of Physics of the Earth (Moscow) and the Trofimuk Institute of Petroleum Geology and Geophysics (Novosibirsk). Publisher Copyright: © 2021, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - The Malyi Orgochor, Orgochor, Birbash, Sukhoi Ridge, Ichketosma, and Tosma uplifts in the eastern Issyk-Kul basin are fault-related anticlinal folds composed of Neogene and Quaternary sediments involved in tectonic movements. The folds have asymmetric transversal profiles, with low-angle southern limbs and steep northern limbs cut by segments of the South Issyk-Kul and Karkara reverse faults reactivated in the late Quaternary. The location and geometry of the two faults, which both show reverse and left-lateral strike slip components, correspond to neotectonic propagation of deformation from the Terskey-Ala-Too Range over almost the whole eastern Issyk-Kul basin. Judging by primary and secondary coseismic surface deformation in the area, the South Issyk-Kul and Karkara faults repeatedly generated large earthquakes (M ≥ 7, I ≥ 9) in the Late Pleistocene and Holocene. According to trenching results, the historical earthquakes that occurred in the first and 10–11th centuries accommodated motions on the South Issyk-Kul fault. The new seismotectonic and paleo-seismicity data from the eastern Issyk-Kul basin provide updates to its seismic potential.

AB - The Malyi Orgochor, Orgochor, Birbash, Sukhoi Ridge, Ichketosma, and Tosma uplifts in the eastern Issyk-Kul basin are fault-related anticlinal folds composed of Neogene and Quaternary sediments involved in tectonic movements. The folds have asymmetric transversal profiles, with low-angle southern limbs and steep northern limbs cut by segments of the South Issyk-Kul and Karkara reverse faults reactivated in the late Quaternary. The location and geometry of the two faults, which both show reverse and left-lateral strike slip components, correspond to neotectonic propagation of deformation from the Terskey-Ala-Too Range over almost the whole eastern Issyk-Kul basin. Judging by primary and secondary coseismic surface deformation in the area, the South Issyk-Kul and Karkara faults repeatedly generated large earthquakes (M ≥ 7, I ≥ 9) in the Late Pleistocene and Holocene. According to trenching results, the historical earthquakes that occurred in the first and 10–11th centuries accommodated motions on the South Issyk-Kul fault. The new seismotectonic and paleo-seismicity data from the eastern Issyk-Kul basin provide updates to its seismic potential.

KW - Eastern Issyk-Kul basin

KW - Fault scarps

KW - Intrabasinal uplifts

KW - Karkara fault

KW - Large paleoearthquakes

KW - Northern Tien Shan

KW - Seismites

KW - South Issyk-Kul fault

UR - http://www.scopus.com/inward/record.url?scp=85105001718&partnerID=8YFLogxK

U2 - 10.2113/RGG20194125

DO - 10.2113/RGG20194125

M3 - Article

AN - SCOPUS:85105001718

VL - 62

SP - 263

EP - 277

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 3

ER -