Abstract: On November 12, 2017, an M_W7.3 earthquake struck Sulaimaniyah province in northern Iraq, causing heavy human and economic losses. In this paper, the co-seismic deformation field of the earthquake was obtained by differential interferometry using the ascending and descending synthetic aperture radar (SAR) data of Sentinel-1 and Alos-2 satellites, combining DInSAR and MAI technologies, the robust least-square method was used to solve the coseismic 3D deformation field of this earthquake. Based on the improved uniform dislocation model considering topography, the fault parameters of seismogenic faults were determined. Finally, the distributed slip distribution of seismogenic faults was obtained based on the non-uniform dislocation model. The results showed that the LOS deformations caused by the Iraq earthquake observed by the ALOS-2 satellite in descending orbit were a maximum of 55.8 cm uplift and 47.9 cm subsidence; the LOS deformations caused by the Iraq earthquake observed by the Sentinel-1 satellite: the maximum ascending orbit uplift of 87.9 cm and sinking of 17.1 cm; the maximum descending orbit of 55.6 cm uplift and 38cm sinking; Compared with the previous research results the geometric parameters of seismogenic faults obtained by the improved inversion method considering topography indicates that the seismogenic faults are NNW strikes. The strike azimuth angle is 352 °. The coseismic rupture is dominated by thrust and has a certain left-lateral strike-slip component. The fault slip distribution obtained from the inversion based on the uniform dislocation model shows that the coseismic rupture did not extend to the surface, the mainshock slip is concentrated at 12~18 km, and the maximum slip is at the depth of 15 km, reaching 4.3 m. The moment magnitude obtained by the inversion is M_W7.35, consistent with the results given by the UGSG and GCMT.

Key words: 2017 Iraq M_W7.3 earthquake, InSAR, Co-seismic deformation, Slip distribution, 3D deformation field