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AIG Resistivity Method

Surface resistivity in surveying is centered around the principle that the distribution of electrical potential into the ground with an electrode carrying a current depends upon the surrounding soils and rocks. The electrical resistivity and distribution of the earth in soil and rocks is the major measurement factor. The acting principle behind surface resistivity is the use of electricity. Interpretation is carried out on the direct currents administered.


Pore water, which is the water administered between grains and sediment, is what is measured in soil and rocks composed of mineral grains. Differences of resistivity in pore water is used in detecting bodies of unfamiliar materials and ions estimating bedrock surface depths.

Other factors in the accuracy of resistibility measurements performed by the AIG resistivity method are metal content and porosity. Metal objects have a very large amount of conductivity contrast with surrounding soil, rock and sediment. These can be easily detected with electromagnetic and electrical methods. When metals are not present, the formation of conductivity is brought about by the amount of water in the soil measurements.

Groundwater can be conducted through its ions, but this will be dependent on the volume of dissolved solids. In addition to water, volume can be utilized as a measurement medium for conductivity. Advanced mathematical formulae are used in instances where there is a clay-free, porous medium that is non-conducting.

Experienced geophysicists know the value of electrical resistivity imaging and the equipment that make it possible for scientists to obtain the most accurate measurements.

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