Due to heavy rains in March 2019, a landslide occurred in the area of Goli village, 21 km west of Bojnourd. During these rains, two areas of the village were affected by landslides. Two-dimensional electrical resistivity tomography was used to investigate the mechanism and depth of failures of these landslides. To identify the landslide, electrical resistivity data were used with dipole-dipole array and electrodes spacing of 5 and 10 meters as well as exploratory boreholes. The results and interpretations of the collected data in 4 profiles of electrical resistivity and 5 boreholes drilled in the area showed that it seems that the infiltration of water from heavy rainfall and rural sewage into marl rocks is the main cause of these slips. The results also showed that the depth of the failure surface is between 3 to 10 meters and the new slides correspond to the failure surface of a large and old landslide.