Dictionary:Audio-magnetotelluric method (AMT)
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{{#category_index:A|audio-magnetotelluric method (AMT)}}
A magnetotelluric method involving measurement of natural plane-wave electromagnetic signals, mainly sferic energy, in the 10 to 104 Hz range to determine subsurface resistivity. See also magnetotelluric method, which involves the 10–3 to 10 Hz range.