Study on the susceptibility of geological disasters in loess tableland area of northern Shaanxi based on GIS and information quantity model

An assessment of regional vulnerability to geological disasters can directly indicate the extent and intensity of risks within the study area. The loess tableland area in northern Shaanxi is located at the junction of the southern part of the loess plateau and the northern part of the Guanzhong Plain, where geological disasters occur frequently. In this paper, the information quantity model method is proposed, seven factors including slope angle, slope height, slope shape, slope direction, slope structure, geomorphic unit type and engineering geological rock group are selected as the susceptibility evaluation index, and the geological hazard susceptibility of Xunyi County, a typical loess tableland, is comprehensively evaluated by GIS platform. The results showed that high, medium, low and very low prone areas accounted for 11.5%, 21.73%, 31.14% and 35.63% of the total area, respectively. Geological disasters are mainly distributed between the loess tableland and loess gully in the transition area. The area under the ROC curve (AUC) was used to evaluate the accuracy, and the AUC was 82.06 %, indicating that the results were accurate. The research results can provide reliable guidance for disaster prevention and control in northern Shaanxi and the entire Loess Plateau.