Abstract：In order to study the coseismic deformation and seismogenic fault slip characteristics of the conjugate earthquakes sequence that occurred in the east Anatolian fault system on February 6, 2023, we use D-InSAR and POT techniques to obtain the coseismic deformation field of the earthquake sequence with the Sentinel-1A data released by ESA. Based on the distributed slip model, we study the geometric form and refined slip distribution inversion of seismogenic faults after data quadtree down-sampling. The results show that the deformation trend of coseismic deformation field of the conjugate earthquakes presents an opposite change trend, and the seismogenic faults are located in the east Anatolian fault system dominated by left-lateral strike-slip. The rupture fault of MW7.8 earthquake is on the main fault zone, with a maximum slip momentum of about 10.5 m and an average slip angle of 3.74°. The rupture fault of MW7.5 earthquake is mainly on the Sügür fault, with a maximum slip momentum of about 11.8 m and an average slip angle of 1.05°. The joint analysis on focal mechanism solution given by USGS and GCMT shows that the two major earthquakes are mainly left-lateral strike-slip earthquakes with a small dip-slip component, and the occurrence of this earthquake sequence is an important manifestation of the present tectonic movement of east Anatolian fault zone.
HAO Xiaoye,ZHANG Yongzhi,LIU Jiaojiao et al. InSAR Coseismic Deformation Observation and Slip Distribution Inversion of the Türkiye Conjugate Earthquakes in 2023[J]. jgg, 2024, 44(5): 479-484.
