2-D electrical resistivity imaging for investigating an active landslide along a ridgeway in Burdur region, southern Turkey

Abstract

Two-dimensional (2-D) electrical resistivity imaging (ERI) technique has been used to characterize a landslide which occurred in a ridgeway between Burdur and Isparta in southern Turkey. The problems related to this road showed an increase due to road constructions and heavy rainfall. Primary attention was drawn to the determination of the thickness of the mobilized material, its possible sliding surface, and evaluation of the groundwater conditions related to the occurrence of the landslide. The eight survey profiles in the landslide area were implemented. Electrical resistivity survey has been carried out by the Wenner–Schlumberger array for data acquisition and smoothness-constrained least-squares method for data inversion. The self-potential (SP) survey data are presented as one-dimensional profile for each of the lines. ERIs pointed out a great heterogeneity of the near surface or mobilizing material and presence of impermeable material that could be associated to lateral and vertical limits of permeability. SP anomalies displayed that the positive values were located in water discharge on the surface whereas negatives in the sites of infiltration. The sliding surface is at a depth of about 10 m.