Geomorphological and geological evidences of the old landslide in Mele Kabud

Old landslides can be effective in the formation or occurrence of landslides. The purpose of this research is to investigate the old landslides before the landslide caused by the Richter 7.3 earthquake in 2016 in the northwestern region of Sarpol-Zahab (Melleh Kabud).In this research, geomorphological and geological evidences such as the geometric shape and topography of the earth, the movement of marl layers on Quaternary alluvial sediments, sedimentology and the analysis of geological layers and the effects of rock dissolution have been used.In the upper parts of this unevenness, the slope is less with a cover of fine-grained clay sediments, and in the lower parts of the slope, it is more composed of particles and coarse-grained stones. The displacement of the lower layers of marl on the surface layers of alluvium and the tilting of the effects of dissolution of rocks are other evidences of the occurrence of old landslides.The lapias, which should be perpendicular to the surface and in the direction of the greatest slope, are located in different directions, which all indicate the occurrence of old landslides in the investigated area.