In geoelectric prospecting, the physical parameter that is determined is the electrical resistivity of the formations that constitute the subsoil and that can vary according to the lithotype, the degree of homogeneity, the degree of alteration and fracturing, the content in water and salts, the granulometry, etc. Other electrical methods, usually dedicated to mining research, geothermal energy or the dispersion of liquids in the ground, are instead based on the measurement of Self Potential or Induced Polarization.
From the classic 1D geoelectrical prospecting - usually performed using 4 electrodes - resistivity values are collected, at increasing depths below the vertical of the survey center (hence the name of Vertical Electric Surveys or VES).
The introduction of automated measurement techniques with the use of multielectrode cables has allowed the rapid development of Electrical Resistivity Tomography (ERT), able to return 2D profiles of high-resolution resistivity, particularly suitable for high resolution, small to medium depth of investigations. By combining several parallel resistivity profiles, a high-resolution 2.5D image can be obtained; with a larger number of electrodes it is even possible to perform true 3D and even 4D tomography investigations (introducing the time factor T), appropriately interpreted through sophisticated processing software.
DISCOVER EVERY POSSIBLE METHODOLOGY AND INVESTIGATION
AQUIFER RESEARCH IN SEDIMENTARY TERRAINS
HIGH RESOLUTION SURFACE INVESTIGATIONS OF LANDSLIDES, RIVER BANKS, POLLUTION DIFFUSION AREAS
CAVITY DETECTION AND BURIED OBJECTS
PEDOLOGICAL AND ARCHAEOLOGICAL INVESTIGATIONS
STUDIES OF GROUNDWATER CONTAMINATION BY SALT WATER
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