Electrical Techniques
1D Resistivity Sounding
Outline
Resistivity measurements are made by passing an electrical current into the ground using a pair of electrodes and measuring the resulting potential gradient within the subsurface using a second electrode pair (normally located between the current electrodes). Resistivity sounding involves gradually increasing the spacing between the current/potential electrodes (or both) in order to increase the depth of investigation. The data collected in this way are converted to apparent resistivity readings that can then be modelled in order to provide information on the thickness of individual resistivity units within the subsurface.
