Fifteen-year evolution of the crustal inner shear deficit in a reference to the recent East Anatolian earthquakes
1 Geophysical Center RAS, Moscow, Russia
2 Hacettepe University, Ankara, Turkey
3 People's Friendship University of Russia, Moscow, Russia
4 Yuzuncu Yil University, Van, Turkey
5 Kocaeli University, Izmit, Turkey
Abstract
The study analyzes the accumulated internal crustal displacements [Gvishiani et al., 2022] in Eastern Anatolia due to the region’s largest earthquakes in 2010, 2020 and 2023. The study used the results of continuous daily GNSS measurements of the TUSAGA-Aktif network (Turkey) [Kurt et al., 2020] over an interval of more than 13 years. Synoptic analysis of the evolution of the displacement vector modules allowed us to see the following features.
15 months before the Elazig earthquake M6.1 (2009), at the site of its epicenter, an isoline of transition from faster displacements to slow ones was formed, which covered the entire territory of the Anatolian block.
After this earthquake, the western regions of the block became mobile, subsequently becoming even more mobile.
The Elazig-Malatya earthquake M6.7 (2020) also occurred at the boundary of the transition from fast movements to slower ones, increasing the displacement modules in the epicentral zone by approximately 2 cm.
This zone of decompression of the earth’s crust dynamically developed over the course of three years until the occurrence of the catastrophic earthquakes of 2023 in the southwest of the region.
Before the catastrophic events of February 2023, a zone of minimal (<5 cm) accumulated displacements formed in the area of their occurrence, showing the most «locked» zone in the entire study area. This once again shows the importance of characterizing displacement deficits for detecting the locations of future large earthquakes [Dokukin et al., 2023].
The location of future quasi-mega-earthquakes before their occurrence is marked by a zone of deficiency of internal movements of the earth’s crust.
After the strongest events, stress relief occurred throughout the entire research area.
Database creation date: November 2023; Publication date: November 2023
Contributor:
Geophysical Center of the Russian Academy of Sciences, Moscow, Russia
Institution: Geophysical Center of the Russian Academy of Sciences, Moscow, Russia
Publisher: Geophysical Center of the Russian Academy of Sciences (GC RAS), Moscow, Russia (http://www.gcras.ru/eng/)
Data format: .mov (QuickTime File Format)
Citation: Kaftan V. I., M. A. Guvenaltin, P. A. Dokukin, M. Toker, T. S. Irmak (2023) Fifteen-year evolution of the crustal inner shear deficit in a reference to the recent East Anatolian earthquakes. ESDB repository, GCRAS, Moscow, https://doi.org/10.2205/ESDB-000877-d03
References:
Gvishiani A. D., Tatarinov V. N., Kaftan V. I., Manevich A. I., Minaev V. A., Ustinov S. A., Shevchuk R. V. Geodynamic Model of the Northern Part of the Nizhnekansk Massif: Fault Tectonics, Deformations, and Insulation Properties of Rock Displacements // Doklady Earth Sciences. 2022. Vol. 507, Part 1. P. 909–915. DOI: 10.1134/S1028334X22600608
Kurt A.İ., Cingöz A., Özdemir S., Peker S., Özel Ö. ve Simav M. Türkiye Ulusal Temel GNSS Ağı (TUTGA) Güncel Koordinat ve Hızlarının GNSS Verilerinin Yeniden Değerlendirilmesi Kapsamında Hesaplanması. // Harita Dergisi. 2020. Vol. 164. P. 1–17
License: 
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
URL for downloading: http://esdb.wdcb.ru/doi/2023/ESDB-000877/ESDB-000877-d03.mov
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