Evaluation of present-day deformations in the Amurian Plate and its surroundings, based on GPS data

Russian Geology and Geophysics - Tập 57 - Trang 1626-1634 - 2016
S.V. Ashurkov1,2, V.A. San’kov1,3, M.A. Serov4, P.Yu. Luk’yanov5, N.N. Grib6, G.S. Bordonskii5, M.G. Dembelov7
1Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
2Institute of Diamond and Precious Metal Geology, Siberian Branch of the Russian Academy of Sciences, pr. Lenina 39, Yakutsk, 677980, Russia
3Irkutsk State University, ul. K. Marksa, 1, Irkutsk 664003, Russia
4Institute of Environment and Nature Management, Far East Branch of the Russian Academy of Sciences, ul. B. Khmelnitskogo 2, Blagoveshchensk, 675000, Russia
5Institute of Natural Resources, Environment, and Geocryology, Siberian Branch of the Russian Academy of Sciences, ul. Butina 26, Chita, 672000, Russia
6Technical Institute, Filial of Amosov North-Eastern Federal University, ul. Yuzhno-Yakutskaya 23, Neryungri, 678960, Russia
7Institute of Physical Material Science, Siberian Branch of the Russian Academy of Sciences, ul. Sakhiyanovoi 6, Ulan-Ude, 670047, Russia

Tóm tắt

Abstract We analyze recent crustal movements, based on data of GPS measurements on the Amurian Plate and its margins. Most of the velocities were borrowed from scientific publications. Also, our new and updated data of periodic and permanent GPS observations are presented. A continuous field of strain rates has been constructed using the combined field of movement velocities. Dilatation rates and the directions and values of the main strain axes have been calculated. We have made a quantitative estimation of the maximum shear rates and their directions. Zones of background deformations in the inner part of the Amurian Plate have been revealed along with high-strain zones. Zones with intense tectonic activity, corresponding to areas of reduced lithosphere, often show manifestations of Late Cenozoic volcanism. Part of them can be interpreted as the present-day boundaries of intracontinental geoblocks and small lithospheric plates.

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