Abstract：We analyze the location andtectonic characteristics of the June 14, 2020 MW5.7 earthquake that occurred in Turkey, evaluating the seismic hazards. In this paper, we use D-InSAR technology to process the Sentinel-1A SAR data and GACOS is used for atmospheric correction to obtain line of sight coseismic deformation field. The LOS coseismic deformation field of descending track shows that the uplift on the north side and the subsidence on the south side of the fault. The maximum subsidence is about -7.75 cm and the maximum uplift value is about 8.87 cm. Constrained by LOS coseismic deformation, first we obtain the geometric parameters of the seismic fault are by Bayesian bootstrap optimization (BABO) method, and then the seismic rupture slip distribution is obtained by finite fault method.The inversion shows that the strike is about 257.48°±0.65°, the dip is about 79.69°±0.98°, the rake is about 154.2°±3.8°, the epicenter is (40.754°E,39.389°N). The length and width of the main rupture region are about 8 km×6 km, the shallowest buried depth is about 0.8 km, the deepest buried depth is about 8.9 km. The maximum slip on the fault is 0.57 m at the depth of 4.278 km. The seismic moment is about 4.54×1017 Nm (MW5.7), which agrees with the results published by the Turkey’s Disaster & Emergency Management Authority.The Turkey earthquake is controlled by a near EW blind fault and is mainly a dextral strike-slip with minor thrust. The earthquake caused the Coulomb failure stress to increase by more than 0.1 bar in some areas, and the future risk of these areas deserves more attention.
LI Chengtao,LI Qi,TAN Kai et al. Coseismic Deformation Field of the 2020 Turkey MW5.7 Earthquake from Sentinel-1A InSAR Data and Rupture Slip Distribution[J]. jgg, 2021, 41(5): 484-490.
