Impact of the Series of Kahramanmaras Catastrophic Earthquakes (February 6, 2023) on the Regime of Recent Movements of the Caucasus Earth’s Crust

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Abstract

Coseismic displacements and deformations of the Earth’scrust from the world’sstrongest earthquakes spread to significant distances from their epicenters. Assessment of the impact of earthquakes on the characteristics of movements and deformations of the Earth’scrust in remote areas is of great scientific and practical interest. The article is devoted to the analysis of the impact of the Turkish Kahramanmaras earthquake (February 6, 2023) on the crustal movements and deformations of the Earth’scrust of the Caucasus region by analyzing the time series of continuous GNSS observations. The velocities of motions in the region, before and after the Kahramanmaras earthquakes were determined. The research results show a significant (and statistically significant) impact of earthquakes on horizontal and vertical crustal movements in remote areas. The following has been confidently recorded: a clockwise reversal of the horizontal movement velocity vectors, a decrease in horizontal velocities, and, predominantly, an increase in vertical movements. The general direction of horizontal movements of the Caucasus GNSS stations is consistent with the postseismic velocity vector of the ANTP station, the closest to the Kahramanmaras epicentral zone, in agreement with the tendency of the Arabian tectonic plate movement. General trends in the combination of pre- and post-seismic movements show the effect of counteraction of the Lesser Caucasus mountain structures to the northeastern pressure of the Arabian tectonic plate wedge. The obtained results provide important information for explaining the mechanisms of regional actuotectonics and the role of strong seismic events in the regime of modern movements of the earth’scrust in the Caucasus.

About the authors

V. I. Kaftan

Geophysical Center, Russian Academy Sciences

Email: v.kaftan@gcras.ru
Moscow, Russia

A. I. Manevich

Geophysical Center, Russian Academy Sciences; University of Science and Technology MISIS

Email: a.manevich@gcras.ru
Moscow, Russia; Moscow, Russia

Yu. V. Gabsatarov

Federal Research Center “Geophysical Survey of the Russian Academy of Sciences”; North Ossetian Branch, Federal Research Center “Geophysical Survey of the Russian Academy of Sciences”

Email: y.v.gabsatarov@yandex.ru
Obninsk, Kaluga region, Russia; Vladikavkaz

J. K. Karapetyan

Institute of Geophysics and Engineering Seismology, National Academy of Sciences of Republic Armenia

Email: jon_iges@mail.ru
Gyumri, Armenia

R. V. Shevchuk

Geophysical Center, Russian Academy Sciences

Email: r.shevchuk@gcras.ru
Moscow, Russia

I. V. Losev

Geophysical Center, Russian Academy Sciences

Email: i.losev@gcras.ru
Moscow, Russia

A. A. Sayapina

North Ossetian Branch, Federal Research Center “Geophysical Survey of the Russian Academy of Sciences”

Email: perev-anna@yandex.ru
Vladikavkaz, Russia

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