Feature and mechanism of geoelectric field related to atmospheric pressure

Using the geoelectric field data recorded by four geoelectric stations in Ningxia, the variation characteristics, spectral characteristics, the relationship with regional pressure variation, and the relationship between the measuring direction and the strike of nearby faults are studied. The research results show that part of the geoelectric field has diurnal variation characteristics, and also has the characteristics of non-periodic variation of atmospheric pressure, which is negatively correlated with the variation of atmospheric pressure, and the correlation is related to the angle between the measuring direction and the strike of nearby faults. It is considered that the geoelectric field has the characteristics of non-periodic change of atmospheric pressure is caused by the fluid “channeling” resulting from the change of air pressure system in the seepage process, which is due to the permeability difference between the bedrock pores and the nearby fault fractures.