The geodynamics before and after the 6 February 2023 Turkey duplet earthquake according to SAR interferometry data

Using the Stacking-InSAR satellite radar interferometry method, time series of the velocity fields of vertical and horizontal geoblock displacements along the west-east direction were calculated in the period before and after the doublet earthquakes with magnitudes of 7.5 and 7.8 that occurred in Turkey on February 6, 2023. Segmentation into blocks with similar displacement velocities was performed using cluster analysis of displacement velocity fields. It has been found that the boundaries of blocks with different temporal geodynamics correspond to bends and transitions from one segment of the East Anatolian Fault (EAF) to another. In the area of ​​the EAF bending in the south-east direction, an extensive small-block structure with different shift rates before the earthquakes was discovered, in the zone of which both epicenters of 7.8 and 7.5 earthquakes were located. Analysis of the temporal dynamics of displacement velocity fields in the period from 2016 to February 2023 confirmed that one of the significant early triggers of the doublet earthquake was an anomalous shift (about 20 cm) in the western direction of a small geoblock, which was associated with seismic activity on January 24, 2020. Data on the geodynamics of the region showed that significant shifts lasted first 8 months after the doublet earthquakes, after which the shift processes became stationary for this region.