Assessment of Landslide by Its Fracture System using Electric Resistivity Tomography and Pressure Probe Method

This chapter aimed to study a slowly moving loess landslide in South Hungary. In contrast with other efforts, we determined its fracture system. Due to the uniform nature of the loess, it appears to be the only way to learn about the landslide's structure and subsequent evolution. The Pressure Probe (PreP) approach was used to characterize the apparently dense fracture system in addition to the well-known Electrical Resistivity Tomography (ERT). This method was created to detect and characterize mechanically weak zones that are not apparent from the surface and can occur as a result of landslides, for example. Fracture zones had been especially well localised by the ERT, enabling the prediction of the positions of future rupture surfaces and thus also the delineation of the endangered zones. Both strategies were successful in identifying the fracture system of a landslide location. The mass movements that happened roughly one and a half years following the measurements confirmed geophysical forecasts. The use of the ERT and PreP methodologies is strongly recommended for providing early risk alerts and avoiding damage to structures or jeopardizing human life.