Brantax - engineering survey

underwater, underground
and surface investigation

Used configurations

All the arrays of electrodes used to obtain the apparent resistivity are basically superposition of the fundamental equation for the potential from a current source with appropriate sign for the current. The formulas for apparent resistivity are a product of the impedance V/I (Ohms) and a geometric factor with the units of length (meters). To investigate the resistivity distribution with depth, called a sounding, the arrays are expanded about a center point and the apparent resistivities are plotted vs. spacing usually on a log-log plot. In the more general case the apparent resistivities are plotted as a function of array spacing and lateral position using plotting conventions that have become accepted for each type of array.