Surface Deformation Analysis in Jiuzhaigou, China Using SBAS-InSAR Technique

In this paper, the surface deformation of Jiuzhaigou County is analyzed. The ascending ALOS-2 data of 15 scenes from December, 2017 to September, 2019 is used, and the results of surface deformation in time series are extracted by the small baseline subset interferometric synthetic aperture radar (SBAS-InSAR) technique. The monitoring results show that the overall deformation rate of Jiuzhaigou is between −10mm/a∼ 10mm/a, which is in a stable state; 261 potential geological hazard points are extracted with an area of about 21.2km2. Field investigation verifies the reliability of SBAS-InSAR technique for surface deformation monitoring. In addition, the factors affecting the development of geological disasters are also discussed.