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Earth Resistivity Imaging
The Earth Resistivity Imaging technique is a geophysical method that uses electrical current to define conductive and resistive areas in the subsurface. Also referred to as Electrical Resistivity Tomography (ERT), it is particularly useful in identifying underground structures, objects, pathways, fluids or zones with conductive properties that contrast with surrounding media. 2-D, 3-D, or borehole resistivity surveys can be performed depending on your need and the scope of work to be done.
Earth Resistivity Imaging is a powerful geophysical technique to identify and define:
Subsurface voids and caves
Sinkholes and other karst features
Fracture zones
Fluid pathways
Highly variable rock surfaces
Large and small scale geologic trends
Contaminant plumes
Metallic and non-metallic objects
When numerous earth resistivity imaging arrays are positioned in close proximity to one another, it is often very helpful to be able to view the overall results in a three-dimensional field. Since subsurface features such as voids, caves, fractures, fluid pathways, and contaminant plumes are rarely two-dimensional features, a 3-D fence diagram of closely placed or overlapping two-dimensional resistivity arrays is often very helpful in characterizing the overall conditions of a project area.