We use 2018–2020 Sentinel-1 InSAR time series data to study post-seismic deformation processes following the 2017 Mw 7.3 Kermanshah, Iraq earthquake. We remove displacements caused by two large aftershock sequences from the displacement field. We find that for a six month period the response is dominated by afterslip along the up-dip extension of the coseismic rupture zone, producing up to 6 cm of radar line-of-sight displacements. The moment magnitude of afterslip is Mw 5.9 or 12% of the mainshock moment. After that period, the displacement field is best explained by viscoelastic relaxation and a lower crustal viscosity of ${\eta }_{lc}=1_{-0.4}^{+0.8}\times {10}^{19}\mathrm{Pas}$ . The viscosity of the uppermost mantle is not constrained by the data, except that it is larger than $0.6\times {10}^{19}\mathrm{Pas}$ . The relatively high lower crustal and uppermost mantle viscosities are consistent with a cold and dry lithosphere of the Zagros region.

The Mw = 7.1 Wushi earthquake is the second-largest digitally recorded earthquake in the Tianshan seismic zone and provides an opportunity to explore the structural characteristics of the Tianshan seismic zone. In this study, we calculated the early (11-month) post-seismic deformation of the Wushi earthquake using Sentine-1 ascending and descending InSAR time series data. We found that the 11-month post-seismic deformation was dominated by afterslip along the up-dip continuation of the coseismic fault. The seismic moment released by the afterslip was Mw = 6.20, with 6.5% of that released by the mainshock. Moreover, we explored four slip models for the Mw = 5.7 aftershock that occurred on 29 January and found that this event primarily ruptured a thrust fault. However, determining the thrust fault type based on the current field investigations and InSAR data remains difficult. Finally, the Coulomb stress changes indicated that both the afterslip and aftershock were promoted by the Wushi earthquake.

Time-series observations from Sentinel-1 A/B InSAR spanning November 2014 to July 2021 were used to study the late post-seismic deformation velocity field arising from the Kokoxili earthquake. The deformation velocity caused by the interseismic slip along the major active faults in Tibet was first simulated. Comparing the simulated deformation velocity with the observed one, the maximum ratio of the simulated deformation velocity to the observed one was found to be 42%, indicating continuity in the viscoelastic relaxation caused by the 2001 Kokoxili earthquake. Subsequently, the rheological structure of the Kokoxili region was explored using a mixed model comprising the viscoelastic relaxation mechanism and the buried elastic dislocation model. The best estimated viscosities for the lower crust and upper mantle were ${\mathsf{\eta }}_{\mathrm{lc}}=1_{-0.44}^{+0.78}\times {10}^{19} \mathrm{Pas}$ and ${\mathsf{\eta }}_{\mathrm{um}}=1_{+0}^{+0.78}\times {10}^{20} \mathrm{Pas}$, respectively. The results obtained in this study were compared with those of previous studies that used the early post-seismic displacement ranging from 0 to 6.5 years following the earthquake. The obtained value was largely the same as the previously estimated steady-state viscosity, which means that the viscosities of the viscoelastic layer beneath the Kokoxili regions have almost reached their stable state. Furthermore, the effective lower crustal viscosity of the Kokoxili region exhibited a logarithmic trend with time.