SLF remote sensing technique based coal mine gas exploration

Super low frequency remote sensing technique introduced here is, with the use of natural electromagnetic waves, used to explore the apparent resistivity of strata on the surface of the Earth, and then to reduce the degree of enrichment of gas underground and indicate the depth of the gas-bearing stratum. The simple theory, exploration method and device are presented in the text. Contrasts are made between the results obtained from experiments and those extracted by drilling at the same location for validating this technique.