Zoning of geomorphological instabilities caused by Azgeleh earthquake (November 13, 2017, Mw = 7.3) in Ilam and Kermanshah provinces with Vikor model

The main purpose of this study is to study and zoning of geomorphological instabilities resulting from seismic earthquakes in Ilam and Kermanshah using Vickor multi-criteria decision making method. The region affected by this earthquake is very prone to various movements and geomorphological instabilities. The reasons for this are the existence of young Zagros folds along with the operation of their cutting faults, which have caused severe fractures in the region. To conduct this research, using topographic maps, geology, satellite images and field operations, geomorphological instabilities that were effective in aggravating earthquake damage were identified and positioned. The most important of these instabilities include landslides, rock falls and avalanches, currents, hilltop ruptures and landslides that lead to road blockages, destruction of residential houses, pollution of water and soil resources, destruction of agricultural lands, Gardens and ... has been. Then, using VIKOR multi-criteria decision making method, instabilities were zoned into 5 categories. In order to validate, the zoning map was adapted to the distribution map of seismic index geomorphological instabilities. The results showed that the two classes of high and very high instability and high risk class with a total area of ​​6558 square kilometers, ie more than 28% of the study area and among the factors affecting the occurrence of instability, factors Geology, distance from the fault and slope with 0.23, 0.22 and 0.15 points, respectively, have the greatest impact on creating instabilities in the region. The result of the adaptation of the zoning map to the distribution map of instabilities indicates the adaptation of most instabilities, including landslides, rock falls and subsidence with high risk classes.