s.e.v

V.E.S. (Vertical Electric Survey) geoelectric prospection method consists in investigating the resistivity variation of a specific territory with depth. It belongs to the most ancient indirect geognostic surveys, non-invasive, which allows to analyze long soil profiles at great depth, with low costs and without disturbing existing buildings or underground water flowing. V.E.S. (Vertical Electric Survey) technique includes a series of resistivity determinations performed by increasing distance between current electrodes (A-B) and potential electrodes (M-N), according to the array of 4 electrodes outlined as it follows. A continuous current is input into the ground throught two external electrodes A and B supplyed by dry batteries or a generator; through central electrodes M and N a potential difference is generated into the ground while the current that flows between A and B is measured. Potential difference measures (pd) and current intensity (I) are measured with precision instruments, equipped with spontaneous potentials.