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The term landslides comprise almost all varieties of mass movements on slopes including rock falls, topples and debris flows that involve little or no true sliding [Varnes, 1984]. Landslides occur when the critical combinations of many internal and external causative factors are met with a triggering event such as intense rainfall, earthquake shaking, volcanic eruption, rapid snow melt, rapid change of water level, storm waves or rapid erosion that causes a quick increase in shear stress or decrease in shear strength of the slope material. In many countries, slopes which stood safe for centuries are now frequented by landslides and hence socioeconomic losses due to its impact are growing. This is mainly due to the expansion of human activities into more susceptible hill slopes under the pressure of increasing population and associated demands for housing and infrastructure facilities. Though this has reduced sustainable development efforts today more than ever before especially in developing countries, practice has shown that adequate hazard mitigation is possible. Landslide hazard zonation involves one of the most complex analysis of interrelated terrain factors such as

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