Solomon G. Cherie, Natnael Agegnehu Ayele
Landslide is the major geohazard in the Ethiopian highlands. We used InSAR and Arc-GIS techniques to map landslide susceptibility. SAR images generated from sentinel 1A are utilized for landslide displacement investigation using InSAR method. GIS analyses result showed that it is a powerful technique to landslide zoning in to low, moderate, high and very high, susceptibility whereas wrapped Interferogram shows a displacement of -12 to 12 mm/yr. Thus, very high and 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 point’s fall on the displacement map (Interferogram) and the same percent of those points overlapped to very high and high landslide zones. Landslide triggered deformation and landslide susceptibility mapping can be well studied using InSAR, which has a capability to give constant coverage and accuracies better than that of classical studies. To interpret and integrate different InSAR results GIS is utilized as a value-adding technique throughout the InSAR process. This means InSAR and GIS method can be utilized for landslide vulnerability mapping but for more accuracy and quantification of landslide displacement.
Published Date: 2021-04-20; Received Date: 2021-03-30