Interaction between permafrost and infrastructure along the Qinghai-Tibet Railway detected via jointly analysis of C- and L-band small baseline SAR interferometry

► We monitor the surface motion along Qinghai-Tibet Railway by C- and L-band InSAR. ► The interaction between permafrost and infrastructure is analyzed. ► A persistent scatterer interferometry model is developed for surface motion inversion. ► The results are further validated by the ground measurements. ► This study implies the necessity for continued monitoring along the QTR.