LANDSLIDE STUDY WITH 2D ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT): A CASE STUDY FROM TURKEY

The electrical resistivity tomography (ERT) method, which has been used in the research and determination of landslides in recent years, has become more widely used with technological developments in field-data collection systems and the emergence of new algorithms for tomographic inversion. The ERT method has been applied to determine potential sliding surfaces and to reveal landslide geometry in mass movement or in areas where landslides have occurred. ERT allows scientists to solve complex geological problems such as landslides and determine the underground structure with advancements in data interpretation. Two-dimensional (2D) and three-dimensional (3D) ERT are both cheap and practical methods for providing underground images across profiles. Furthermore, multi-electrode data collection systems enable the usage of different arrays and reduce the time needed for data collection. In this study, an ERT survey was carried out in the landslide region of Ulukisla county of Nigde province. ERT data in the study area were obtained with a multi-electrode electrical resistivity system using the AGI R8 device, which can measure 8-channel 84-electrode resistivity. In the resistivity studies, six parallel 82 m long profiles were examined by using 42 electrodes, and the Dipole-Dipole-Gradient method was applied. The obtained resistivity field data were analyzed in Earthimager 2D and Earthimager 3D programs with the reverse solution process to form a model of the underground resistivity. ERT data were interpreted by conducting 2D and 3D resistivity modeling studies on the results to determine the depth, thickness, resistivity values, and water retention properties of the units.