Abstract: Taking the mountain landslide occurred in Zaoling township in Shanxi province on March 15, 2019 as the research object, using Sentinel-1A SAR image data from July 5, 2018 to June 30, 2019 (a total of 30 scenes) before and after the landslide, this papere monitors the deformation data of landslides with the support of SBAS-InSAR technology. The results show that the deformation range of the study area is -52.03 to 33.77 mm/a, and the overall environment is relatively stable. The deformation rate and cumulative deformation variables of the long-term loess plateau are analyzed. The causes of landslides are analyzed based on relevant geological data from the research area. Using the standard deviation ellipse algorithm, it analyzes the spatio-temporal evolution characteristics of surface deformation in the loess plateau area where the landslide is located. The results show that the center of gravity of the standard deviation ellipse shifts to the northwest, the elliptical area decreases slightly, the deformation intensifies in the northwest southeast direction, and the deformation development in the northeast southwest direction is relatively gentle. The azimuth angle rotates counterclockwise, and the displacement is about 17.03 °.

Key words: 3·15 landslide in Zaoling township, SBAS-InSAR, landslide genesis, deformation rate, spatio-temporal evolution