Deformation analysis of Sela landslide in the upper reaches of Jinsha River based on MSBAS technology

The Jinshajiang suture zone is a high-incidence area of landslide disasters and has a greater threat of river jamming. In this paper, the Sela landslide with high risk of blocking rivers was taken as the research object, and the Sentinel-1A/B images were selected and processed by MSBAS InSAR technology to obtain the surface deformation of the landslide. We used the Sentinel-1A/B images from different orbits to obtain the two-dimensional dynamic deformation of the Sela landslide from 2018 to 2020. Deformation time series characteristics of typical points are analyzed. The results show that the cumulative deformation in the east-west direction of Sala landslide reached a maximum of 165 mm, and the cumulative deformation in the vertical direction reached −102 mm from January 2018 to April 2020. We studied the deformation trend of the landslide, and the accuracy of the landslide monitoring results was verified by the field survey results.