SuperSting R8 Induced

Polarization Meter

EMC uses the Advanced Geosciences, Inc. SuperSting R8 IP Electrical Resistivity system and either the Wenner or Schulmberger Arrays to measure resistivity soundings.  Raw sounding data are analyzed using a state-of-the-art computer program, Interpex’s RESIX, to transform the raw data into the required resistivity versus depth distribution.

Direct Current (DC) resistivity measurements are made by injecting electrical current into the ground via a pair of metal electrodes driven into the soil and then measuring the resulting voltages set up on an independent pair of similar electrodes.  Expanding the geometry of the four-electrode set results in deepening the depth-of-investigation.  By matching the observed data of instrument reading versus electrode spacing with the theoretical results predicted by a layered earth model, a best-fitting model of the subsurface is found.  Such a procedure is termed a vertical electrical sounding (VES) and is used to determine the vertical distribution of resistivity (layer resistivity versus depth).