Landslide hazard zonation by using Analytical hierarchy process(AHP) and Boolean logic in Bagheran Mountain(south of Birjand)

Landslide is a geological events which causes enormous human and financial losses in country every year. in this paper ,first map of landslides distribution in Bagheran mountain(south of Birjand that occupied about1100 km2)was prepared by aerial photos, geological maps and field surveys. in this topic, effective parameters will prioritize. Then with Analytical hierarchy process (AHP) and Boolean logic, the weight of parameters were determined and finally combined together by ARC GIS. The results of Landslide hazard mapping indicate erosion, distance from fault and accelerate factors are most importance in creating landslides in this area. Base on field evidence, rock fall landslides are more abundance in area and results indicate that more %85 of landslides are within 0-700 meters of faults, which indicates a direct correlation with regional tectonic. The percent of slope show most of landslides are formed in15-40 degrees of slope. Also more %95 of landslides are in low and very low resistance to erosion. The results of landslide hazard mapping based on analytical hierarchy process, Respectively 15, 12, 25, 29 and 19 % of the area were at very low risk class, low, medium, high and very high.