Landslide Hazard Zonation and Evaluation in and Around Funyan Biro Town (Gursum District), Hararghe Oromia, Eastern Ethiopia: Using Statistical Approach

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Addis Ababa University


The present study area is located in the eastern Hararghe zone of the Oromia region, Gursum District, Eastern Ethiopia, 581km from Addis Ababa. The area is prone for landslide activities and roads in the area, agricultural lands and human and animal lives are at risk to this devastating natural hazard. The main objective of this study is to evaluate landslides and to produce landslide hazard zonation map for the study area. In order to prepare landslide hazard zonation map, statistical approach was followed. Landslide inventory map was developed through field work, and with help of remote sensing data. A total of 35 past landslides in the present study area were identified and recorded through field work and with the help of GPS. Six causative factors were used namely; slope, elevation, aspect, slope materials, land use and land cover, and groundwater conditions were considered for landslide hazard zonation and evaluation. Information value method was used for the present study. Then, landslide hazard zonation map of the study area was classified into five hazard classes namely; very low, low, moderate, high and very high hazard landslide classes. The result of landslide hazard zonation (LHZ) map of the study area revealed that 33% (40Km2) of the study area falls under very low hazard, 29% (35 Km2) as low hazard, 23% (28Km2) as moderate hazard, 10% (11 Km2) as high hazard, and the rest 5% (6 Km2) as very high hazard area. The result of overlay analysis of past landslide and LHZ map showed that 62.8% (22) of past landslides occurred within very high hazard (VHH) zone whereas 34.2% of the past landslide fall under high hazard (HH) zone of landslide hazard zonation map of the present study area. Further, only 3% (1) of the past landslide fall within moderate hazard zone. Thus, the results clearly shows that 97% of the past landslide fall within high hazard (HH) and very high hazard zones (VHH).



Landslide Hazard Zonation Map, Statistical Approach, Information Value