Time-series InSAR for pre-failure two-dimensional deformation tracing and post-failure risk evaluation
According to the large-scale instability occurred in the Hooskanaden landslide on the west coast of Oregon,USA,and the stability of the slope after failure is still unknown,this paper uses SBAS-InSAR technology to analyze the pre-disaster deformation mode,driving factors and post-disaster stable state of the Hooskanaden landslide based on the ascending and descending Sentinel-1 images. The results show that the Hooskanaden landslide was in a state of continuous creep before the event in 2019,and its maximum deformation rate along the LOS direction could reach-226 mm/a;The Hooskanaden landslide is a progressive landslide,mainly moving horizontally from east to west,and the combination of two-dimensional deformation and dip angle is beneficial to infer the deformation mode of the landslide;The landslide movement has obvious seasonal cycle changes,and rainfall is the main driving factor for its accelerated deformation;The middle part and trailing edge of the Hooskanaden landslide are still active after the failure,with a maximum deformation rate along the LOS direction reaches-65 mm/a,and there is a possibility of failure again.
万方数据
维普
