Seismotectonic studies of the pleistoseist area of the Ms = 6.9 Ilin-Tass earthquake in northeast Yakutia
- Autores: Imaeva L.1,2, Koz’min B.3, Imaev V.1,2, Mackey K.4
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Afiliações:
- Institute of the Earth’s Crust, Siberian Division
- Technical Institute (Branch) of North-Eastern Federal University
- Diamond and Precious Metal Geology Institute, Siberian Division
- Department of Geological Sciences
- Edição: Volume 52, Nº 6 (2016)
- Páginas: 821-835
- Seção: Article
- URL: https://journals.rcsi.science/1069-3513/article/view/223842
- DOI: https://doi.org/10.1134/S1069351316050050
- ID: 223842
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Resumo
The complex seismotectonic studies of the pleistoseist area of the Ilin-Tas earthquake (Ms = 6.9), one of the strongest seismic events ever recorded by the regional seismic network in northeastern Russia, are carried out. The structural tectonic position, morphotectonic features of present-day topography, active faults, and types of Cenozoic deformations of the epicentral zone are analyzed. The data of the instrumental observations are summarized, and the manifestations of the strong seismic events in the Yana–Indigirka segment of the Cherskii seismotectonic zone are considered. The explanation is suggested for the dynamical tectonic setting responsible for the Andrei-Tas seismic maximum. This setting is created by the influence of the Kolyma–Omolon indenter, which intrudes into the Cherskii seismotectonic zone from the region of the North American lithospheric plate and forms the main seismogenic structures of the Yana–Indigirka segment in the frontal zone (the Ilin-Tas anticlinorium). The highest seismic potential is noted in the Andrei- Tas block—the focus of the main tectonic impacts from the Kolyma–Omolon superterrane. The general trend of this block coincides with the orientation of the major axis of isoseismal ellipses (azimuth 50°–85°), which were determined from the observations of macroseismic effects on the ground after the Uyandina (Ms = 5.6), Andrei-Tas (Ms = 6.1), and Ilin-Tas (Ms = 6.9) earthquakes.
Sobre autores
L. Imaeva
Institute of the Earth’s Crust, Siberian Division; Technical Institute (Branch) of North-Eastern Federal University
Autor responsável pela correspondência
Email: imaeva@crust.irk.ru
Rússia, ul. Lermontova 128, Irkutsk, 664033; ul. Yuzhno-Yakutskaya 23, Neryungri, 678922
B. Koz’min
Diamond and Precious Metal Geology Institute, Siberian Division
Email: imaeva@crust.irk.ru
Rússia, pr. Lenina 39, Yakutsk, Sakha Republic (Yakutia), 677980
V. Imaev
Institute of the Earth’s Crust, Siberian Division; Technical Institute (Branch) of North-Eastern Federal University
Email: imaeva@crust.irk.ru
Rússia, ul. Lermontova 128, Irkutsk, 664033; ul. Yuzhno-Yakutskaya 23, Neryungri, 678922
K. Mackey
Department of Geological Sciences
Email: imaeva@crust.irk.ru
Estados Unidos da América, East Lansing, MI, 48824