Инд. авторы: Deev E.V., Turova I.V., Borodovskiy A.P., Zolnikov I.D., Oleszczak L.
Заглавие: Unknown large ancient earthquakes along the Kurai fault zone (Gorny Altai): new results of palaeoseismological and archaeoseismological studies
Библ. ссылка: Deev E.V., Turova I.V., Borodovskiy A.P., Zolnikov I.D., Oleszczak L. Unknown large ancient earthquakes along the Kurai fault zone (Gorny Altai): new results of palaeoseismological and archaeoseismological studies // International Geology Review. - 2017. - Vol.59. - Iss. 3. - P.293-310. - ISSN 0020-6814. - EISSN 1938-2839.
Внешние системы: DOI: 10.1080/00206814.2016.1258675; РИНЦ: 29470032; SCOPUS: 2-s2.0-85004011423; WoS: 000394363100003;
Реферат: eng: Palaeoseismological and archaeoseismological studies in the Kurai fault zone, along which the Kurai Range is thrust onto Cenozoic deposits of the Chuya intramontane basin, led to the identification of a long reverse fault scarp 8.0 m high. The scarp segments are primary seismic deformations of large ancient earthquakes. The scarp’s morphology, results of trenching investigations, and deformations of Neogene deposits indicate a thrusting of the piedmont plain onto the Kurai Range, which is unique for the Gorny Altai. Similarly for Northern Tien Shan, we explain this by the formation of both a thrust transporting the mountain range onto the depression and a branching thrust dislocation that forms the detected fault scarp. In a trench made in one of the scarp segments, we identified the parameters of the seismogenic fault–a thrust with a 30° dipping plane. The reconstructed displacement along the fault plane is 4.8 m and the vertical displacement is 2.4 m, which indicates a 7.2–7.6 magnitude of the ancient earthquake. The 14C age of the humus-rich loamy sand from the lower part of the colluvial wedge constrains the age of the earthquake at 3403–3059 years BP. Younger than 2500 years seismogenic displacements along the fault scarp are indicated by deformations of cairn structures of the Turalu–Dzhyurt-III burial mound, which was previously dated as iron age between the second half of I BC and I AD. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
Ключевые слова: Kurai fault zone; Gorny Altai; ancient earthquakes; Fault scarp; palaeoseismology;
Издано: 2017
Физ. характеристика: с.293-310
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