Abstract
Landslide hazard investigation by using a standard geological survey in a mountainous terrain can result in low accuracy and poor update rate. These deficiencies could lead to unrecorded landslides, which could be catastrophic. Synthetic aperture radar interferometry (InSAR), which can detect subtle ground surface movements in large areas, is considered as a promising solution for detecting unrecorded landslides in mountainous terrains. To evaluate its feasibility, this study conducted analysis work and associated field survey in Fengjie County. The county is characterized by a mountainous terrain and is located in a notoriously landslide-prone area in the Three Gorges reservoir in China. A total of 30 SAR images captured by the Sentinel-1A satellite in 2018 were processed to obtain the ground surface movements of the county. InSAR results identified 276 anomalous regions that were not recorded in the local inventory map. Of these regions, 18 were verified as unrecorded landslides on the basis of the field survey. The observable deformation of the landslides recorded in the local inventory map was also detected by InSAR. This work, which is not supposed to diminish the importance of standard geological surveys, could improve the accuracy and update rate of local inventory maps.
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