Backus-Gilbert Inversion Of Electrical Resistivity Soundings And Its Application To Solid-Waste Landfills

Electrical resistivity surveys are conducted by injecting a known current into the earth through<br>two electrodes and measuring the resulting voltage across two other electrodes. By varying the<br>locations of the electrodes and applying appropriate interpretation techniques, a three-dimensional<br>model of subsurface material resistivity can be developed. This material resistivity normally<br>reflects either the salinity of the contained fluids or the amount of disseminated clay minerals so<br>the electrical techniques have a broad range of applications in groundwater and environmental<br>investigations.