Electrical Resistivity Imaging

Four Oaks Geophysics uses an AGI Super Sting system. Due to the different sizes of the targets our personnel have investigated before (small tunnels to large karst features) the spacing of the electrodes will vary from site to site and target to target.

Electrical Resistivity is a wonderful application to identify karst conditions, depth to bedrock, strata thickness and limits of buried debris and contaminant plumes. ERI is limited to approximately 20 percent of the line length. Site size and the target size or resolution required determine the line length and spacing between electrodes. If a higher resolution for smaller targets is required, a short a-spacing (distance between electrodes) is used. however, if the target is large caverns or karst features and wider spacing can be used which in turn, increases the line length providing a deeper investigation.