Limited to about 60% to 70% of the skin depth of the surrounding Tabular conductors in a resistive host rock such as faults in The VLF method uses relatively simple instruments and can be a Surface through deviation of the normal radiated field. Produce secondary magnetic fields that can be detected at the Uniform in the far field at a large distance (hundreds of Under normal conditions, the fields produced are relatively These radio transmitters are very powerful and induce electricĬurrents in conductive bodies thousands of kilometers away. Magnetic field component each perpendicular to the direction of
Horizontally layered earth and measured on the earth's surface,Ĭonsists of a vertical electric field component and a horizontal Remote VLF transmitter, propagating over a uniform or Relative toįrequencies generally used in geophysical exploration, these areĪctually very high frequencies. Means very low frequency, about 15 to 25 kHz.
The VLF method uses powerful remote radio transmitters set up inĭifferent parts of the world for military communications (KleinĪnd Lajoie, 1980).
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