Earthquake and Landslide Hazard Zonation Using Fuzzy Logic in Bagheran Mountain (South of Birjand)

Earthquake and Landslide are geological events which cause enormous human and financial losses in country every year. In this research first map of landslides distribution in Bagheran Mountain was prepared by aerial photos, geological maps and field surveys. Then effective factors in both earthquake and landslide occurrence are identified ، their class density and binary comparison were calculated, effective parameters will prioritize, then determine fuzzy membership degree of parameters by fuzzy logic and finally combined together. Zoning studies suggest that seismic Isoacceleration factor has highest weight in occurrence of earthquakes in the region. Also seismic acceleration and distance from fault factors have highest weight in occurrence of landslide in the region. The export maps of earthquake zonation from fuzzy operators show fuzzy sum map has high correlation with real map Thereby 42% of area are in high and very high risk classes of earthquake. Finally, after combination of landslide and earthquake maps combination was showed that fuzzy sum map has high correlation respectively12, 21, 22, 19 and 26% of the area are at very high risk class, high, medium, low and very low