Landslides Hazard Zonation of the Safaroud Watershed

Identification of regions having potential occurrence, is one of preparing landslides hazard zonation the basic measures in natural resources management. In this Study, in order to preparing landslides hazard zonation map in Safaroud watershed, by using geographical information system software (ArcGIS9.3), topographic maps (1:25000), field observations and interpretation of aerial photo, basic maps such as geographical map, hypsometry, slope classification, slope aspect, the average annual rainfall, maximum 24-hour rainfall with return period 100 years, the maximum earthquake acceleration and the distance of roads, rivers and faults, is produced. Then using logistic regression method, landslides hazard zonation map of this watershed prepared. The results showed that 52.28 percent area of Safaroud watershed had high and very high classes of hazard, and that located on formations content layer of silt stone, sheyl, sandstone, conglomera and coal, on Slope from 15 to 35 degrees, close to roads, rivers and faults and in the average of elevation (1000 to 1500 meters asl.) that have large amount of rainfall (more than 850 mm).