DC Resistivity Survey (Wenner Array)
Exploration Technique: DC Resistivity Survey (Wenner Array)
|Exploration Technique Information|
|Exploration Group:||Geophysical Techniques|
|Exploration Sub Group:||Electrical Techniques|
|Parent Exploration Technique:||Vertical Electrical Sounding Configurations|
|Information Provided by Technique|
|Lithology:||Rock composition, mineral and clay content|
|Stratigraphic/Structural:||Detection of permeable pathways, fracture zones, faults|
|Hydrological:||Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water|
|Thermal:||Resistivity influenced by temperature|
The advantages of the Wenner array are that the apparent resistivity is easily calculated in the field and the instrument sensitivity is not as crucial as with other array geometries. Relatively small current magnitudes are needed to produce measurable potential differences. The disadvantages are that for each sounding, all of the electrodes have to be moved to a new position. In order to image deep into the earth, it is necessary to use longer current cables; handling the cables and electrodes between each measurement can be cumbersome, especially in difficult terrain. The Wenner array is also very sensitive to near surface inhomogeneities which may skew deeper electrical responses. 
• The Wenner array is a labor-intensive survey because of the cable lengths required and the movement of the electrodes during the survey.
• Substantial lengths of cable energized with current at high voltage present a safety hazard.
- ( Keller, 1966) "Dipole Method for Deep Resistivity Studies"
- (EPA, 1993) "Use of Airborne, Surface, and Borehole Geophysical Techniques at Contaminated Sites"
- (UW-Madison, n.d.) "Introduction to Applied Geophysics"
- (Morrison and Gasperikova, 2012) "DC Resistivity and IP field systems, data processing and interpretation"
|Page||Area||Activity Start Date||Activity End Date||Reference Material|
|DC Resistivity Survey (Wenner Array) At Mt Princeton Hot Springs Geothermal Area (Richards, Et Al., 2010)||Mt Princeton Hot Springs Geothermal Area||2008||2010|