Landslide Susceptible Mapping Using InSAR and GIS Techniques: A Case Study at Debresina Area

Cherie SG and Ayele NA

Published on: 2023-02-11

Abstract

Landslide is the major geohazard in the Ethiopian highlands. We used InSAR and GIS techniques to map landslide susceptibility. SAR images generated from sentinel 1A are utilized for landslide displacement investigation during InSAR method. GIS analyses result showed that it is a powerful technique to landslide zoning in to very high, high, moderate and low susceptibility whereas wrapped Interferogram shows a displacement of -12 to 12 mm/yr. Thus, high and very high classes of landslide zoning overlapped on the highest displacement regions. Results were validated with GPS data using R-index method. Accordingly, 79.45% of sample points fall on the displacement map (Interferogram) and the same percent of those points overlapped to the high and very high landslide zones. This means InSAR and GIS method can be used for landslide susceptibility mapping but for more accuracy and quantification of landslide displacement, InSAR techniques is recommended.