Magnetotellurics/ Audio Magnetotellurics (MT/AMT) is a passive geophysical method which utilizes naturally occurring electromagnetic fields as a source. These electromagnetic signals at low frequency are generated by the interaction between the Earth's magnetosphere and the solar wind, while signals of high frequency audio spectrum are generated by globally occurring thunderstorms.
AMT, operating at higher frequencies, is optimized for imaging shallow to mid-depth targets, while MT covers a broader frequency range, allowing exploration of deeper structures. Both involve simultaneous recording of electric components using non polarizable electrodes and magnetic field components using magnetometers or coils. These components are then analyzed through tensor decomposition and 3D inversion techniques to construct detailed resistivity models from shallow depths to several kilometers. These directional models are very helpful for understanding the deep structural framework that controls the emplacement of metallic mineralization, including fluid pathways and thermal regimes. Its non-invasive nature minimizes environmental impact, eliminating the need for artificial sources.
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