Anomalous Geodynamics before the 2023 Earthquake in Turkey According to Radar Interferometry 2018–2023

Displacement velocity fields of the block-fault structure are constructed and the main geodynamic processes in the area of the East Anatolian fault are revealed based on the results of processing of 437 radar interferograms obtained from the Sentinel-1 radar in the period from the beginning of 2018 to disastrous seismic activity in February 2023 in Turkey by Stacking InSAR method. Anomalous block displacements along this fault have been identified, which are timed to the earthquake of January 24, 2020 (M = 6.7). Zones of stress-strain state of the main blocks in the period preceding the earthquake have been established using cluster analysis of time series of velocity fields. It is shown that the epicenters of February 2023 earthquakes are located in these zones. It is concluded that it is necessary to use such a technique to assess the stress-strain state in order to predict seismic activity.