Tides Variations of Rocks Resistivity and Accuracy of the Electromagnetic Soundings

The progress of electromagnetic soundings last years has allowed to increase of measurements accuracy and has expanded a number of a soluble geological problems. At the same time, for use of a new capabilities of electromagnetic soundings there are the necessity of taking into account the factors, which earlier at smaller accuracy of measurements were not considered as a possible source of errors. One of such factors are the variations of rocks electrical resistivity, arising onder effect of the Earth tides.