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ERT surveys are performed by discharging an electrical current to the ground through electrodes nailed to the ground. The current flows between the electrodes and fans out through the ground in a pattern and intensity dependant on the conductivity of the soils and any stratification or obstacles in the vicinity of the electrodes. Main advantages of ERT against GPR is that ERT penetration is not limited by highly conductive soils, it can be said that these kind of soils are rather beneficial.
Oman ERT and GPR survey
Results of ERT surveying showing in vertical slices 2 big cavities (graves-burial chambers).