An Investigation of Effective Factors in landslideHazard Using GIS (Case Study: Safaroud Basin)

Landslide is one of the natural disasters that causes loss of life, financial damages,slide mass into rivers and other problems. Recognition of the factors and processes thatcontinuously influenced on the amplitudes and made them tend towards instability, caneffectively help to reduce these damaes. This research has been carried out in SafaroudBasin, Ramsar, to determine effective factors in landslide hazard, classify the factors,determine the weight or rate that indicate the functions of these factors in occuringlandslides. This research is evaluated the factors of lithology, fault, hight, Slope,direction, rainfall, channel, soil, vegetation, ramp and villages of area and GIS hasbeen used for preparing and integrating thematic layers and evaluating all of thefactors, weighting and combining them. It is used to weighting the criteria by AHP.The criterion of weighting of the existing elements in each layer has been based ont he most effective role played in the layer and in landslide. The obtained results showt hat the effective factors in the landslide hazards of the area are systematically relatedt o each other and wherever a man has more interfered and the role of effective factorshas been more, the landslide hazard has been more.