Slope stability analysis of deep-seated landslides using limit equilibrium and finite element methods in Debre Sina area, Ethiopia

Abstract Slope failure is a recurring natural hazard in the western margin of Main Ethiopian Rift and especially around Debre Sina area. To minimize damage caused by events, detailed investigation landslide-prone areas identified using numerical modelling plays crucial role. The main aim this study to assess stability slopes evaluate compare safety factors calculated different available methods. Stability analyses prone types failures were performed with techniques. was assessed for complex geometry composed aphanitic basalt, porphyritic tuff, colluvium (poorly sorted clayey sand silty sand) limit equilibrium method shear strength reduction based on finite elements. Furthermore, analysis done under static pseudo-static loading horizontal seismic coefficient model their during event. Satellite images used select failure-prone slope properties past landslides, as well derive structural geological information models. indicates that studied are unstable, any small-scale disturbance will further reduce factor cause failure. landslide hills area strongly depends saturation conditions load.