The audiomagnetotelluric (AMT) method is an electromagnetic technique that uses naturally occurring currents and electrical storms in the ionosphere - passive sources of energy - to electrically map geological structures to depths of 500 meters or more. AMT and MT geophysical methods combine measurements of electric and magnetic fields acquired by means of dipoles and magnetic sensors over a wide range of frequencies.
Electromagnetic (EM) field signals are generated in the atmosphere and magnetosphere. The time variations of the electric and magnetic fields induce currents in the earth and oceans which produce magnetotelluric (MT) signals, these signals are measured by AMT and MT acquisition systems. Low frequency (< 1 Hz) electromagnetic (EM) signals are generated by the interaction between the earth's magnetosphere and the solar wind. Signals in the high-frequency audio range (>1 Hz) are generated by globally occurring thunderstorms.
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