Landslide susceptibility mapping of the Izmir metropolitan area

In this study, it is aimed to produce landslide susceptibility map using the combined method in the İzmir city settlement area and its surroundings. In the study, slope angle, slope aspect, lithology, elevation, curvature, stream power index, discontinuity of density, land use and distance from stream parameters were selected as factors of affecting the landslide and using these factors, logical regression, analytical hierarchy process, frequency ratio and index of entropy methods were used for producing landslide susceptibility map. After produced those susceptibility map, combined method was used among these methods. Finally, the landslide susceptibility maps produced using the combined method and other methods were compared with each other. For comparison, the landslide susceptibility maps and the landslide inventory were compared and it has been determined to what extent areas that are high and extremely high susceptible of landslides match the landslide inventory. According to this comparison, it was determined that the method working with the highest to lowest efficiency are combined method, index of entropy, frequency ratio, analytical hierarchy process and logical regression method, respectively.