Electrical Resistivity survey
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We are offering electrical resistivity survey. Dc resistivity techniques, sometimes referred to as electrical resistivity (er), electrical resistivity imaging (eri) or vertical electric sounding (ves), measure earth resistivity by driving a direct current (dc) signal into the ground and measuring the resulting potentials (voltages) created in the earth. From that data, electrical properties of the earth (the geo-electric section) can be derived and thereby the geologic properties inferred. The technique consists of driving two electrodes into the earth to supply current to the ground. Two additional electrodes are used to measure the earth voltage (or electrical potential) generated by the current. Depth of investigation is a function of the electrode spacing. The depth of investigation is generally 20% to 40% of the outer electrode spacing, depending on the earth. The resistivity data is then used to create a hypothetical model of the earth and its resistivity structure (geo-electric sections). If borehole data or a conceptual geologic model is available, then a geologic identity can be assigned to the geo-electric units. A two-dimensional geo-electric section may be made up of a series of one-dimensional soundings joined together to form a two-dimensional section. The type of section produced depends on the acquisition parameters and the type of processing applied to the data. Electrical resistivity tomography is carried out using multi-electrodes spaced at desired intervals along a linear profile.
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Electrical Resistivity Survey Services
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The Electrical Resistivity Survey technique is applicable in ground water exploration, bed rock mapping, mineral exploration etc. Resistivity measurements can be interpreted qualitatively and quantitatively in terms of a lithologic and geohydrologic model of the subsurface.
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