Experimental study on effect of underground water on geoelectric precursors

In the experiment, sand with water was used as the sample. The quantitative change of the sample resistivity was studied under the different height of gravity water, the different saturation degree, different mineralized degree and different pressure. The experiment shows that the medium's resistivity of the sample has a very close relation with the characteristics of the water in it. The experiment is the first one to take the precursors of the underground fluid and geoelectricity as a whole to study the internal relations between them, and to analyse the correlative characteristics.