Electrical Resistivity

Electrical Resistivity is the geophysical method used to measure the apparent resistivity of the subsurface material, which eventually measures and detect the effects of variation of ground water, soil type, bedrock fractures and contaminants. Variations in electrical resistivity may indicate changes in ground water potential, composition, layer thickness or contaminant levels.

The resistivity method is useful for simultaneously detecting lateral and vertical changes in subsurface electrical properties. Electrical resistivity is also used to delineate 3-dimensional bodies with anomalous electrical conductivities. We use traditional Vertical Electrical Sounding (VES) and lateral profiling methods, depending on the client's need. State-of-the-art 2-D imaging technique is also used to produce the best results for any situation faced by our clients. Electrical Resistivity method is widely used for environmental and geotechnical applications with the help of rapid, automated data acquisition systems, which can be used to create 2-D resistivity images called tomograms.

In Electrical Resistivity Method data are acquired at electrode stations spaced along survey lines using four electrodes. Current is passed into ground using two electrodes and voltage is measured using other two electrodes to measure the apparent resistivity of sub-surface material. Our digital field data recording system allows us to collect and interpret data both rapidly and accurately.

We at ORIZON are fully capable of deploying several electrode array geometries, but usually we prefer to use vertical electrical sounding and lateral profiling for generating a high quality data set, which is suitable to most of the applications.


  • Mapping and delineation of groundwater resources
  • Landfill detection
  • Geological mapping & Lithological stratification
  • Environmental studies
  • Water resource management
  • Electrical characteristics of surrounding area
  • To determine depth of WT
  • To locate and define contamination
  • To determine extent of saltwater and salinity
  • To locate fractures and faults
  • Identification of potentially unstable ground, e.g.voids etc
  • To determine overburden thickness
  • Corrosion study for controlling design

We at ORIZON provide our client an accurate assessment of their requirements to determine applicability of the resistivity method at any site.