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Active tectonics and paleoseismicity of the eastern Issyk-Kul Basin (Kyrgyzstan, Tien Shan)

A. M. Korzhenkov, E. V. Deev, I. V. Turova, S. V. Abdieva, S. S. Ivanov, J. Liu, I. V. Mazeika, E. A. Rogozhin, A. A. Strelnikov, A. B. Fortuna and M. T. Usmanova
Active tectonics and paleoseismicity of the eastern Issyk-Kul Basin (Kyrgyzstan, Tien Shan)
Russian Geology and Geophysics (March 2021) 62 (3): 263-277

Abstract

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 > or =7, I > or =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 paleoseismicity data from the eastern Issyk-Kul basin provide updates to its seismic potential.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 62
Serial Issue: 3
Title: Active tectonics and paleoseismicity of the eastern Issyk-Kul Basin (Kyrgyzstan, Tien Shan)
Affiliation: Russian Academy of Sciences, Schmidt Institute of Physics of the Earth, Moscow, Russian Federation
Pages: 263-277
Published: 202103
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 58
Accession Number: 2021-075515
Categories: Structural geologySeismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 1 table, sketch maps
N42°00'00" - N43°00'00", E76°00'00" - E79°00'00"
Secondary Affiliation: Kyrgyz Russian Slavic University, KGZ, KyrgyzstanRussian Academy of Sciences, Trofimuk Institute of Petroleum Geology and Geophysics, RUS, Russian FederationRussian Academy of Sciences, Institute of Geography, RUS, Russian FederationBalasagyn Kyrgyz National University, KGZ, KyrgyzstanChina Earthquake Administration, CHN, ChinaNature Research Centre Vilnius, LTU, LithuaniaAcademy of Sciences of Uzbekistan, G. A. Mavlyanov Institute of Seismology, UZB, Uzbekistan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202152
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