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The Audio-Magnetotelluric Method (AMT) - USGS
https://pubs.usgs.gov/of/2003/of03-056/html/AMTMdesc.htm
Open-file Report 03-056 -- AMT description The Audio-Magnetotelluric Method (AMT) The Audio-magnetotelluric (AMT) method uses natural electromagnetic (EM) fields to investigate the electrical conductivity structure of the earth. Energy for the natural source EM frequencies higher than about one hertz are generated by thunderstorms worldwide.
Audio-frequency magnetotelluric sounding; a case history ...
https://pubs.geoscienceworld.org/geophysics/article-abstract/44/8/1429/68346/Audio-frequency-magnetotelluric-sounding-a-case
We present the results of an audio-frequency magnetotelluric (AMT) survey which indicate adequate lateral resolution of the conductors. The two main conductive zones are most clearly detected when the electric field sensor is oriented normal to the zones, a feature that is characteristic of narrow buried bodies.
Audio-Magnetotelluric (AMT) Soundings across the Margin of ...
https://pubs.usgs.gov/pp/2005/1688/ak/PP1688_chapJ-508.pdf
Tensor Audio-Magnetotelluric Soundings The impedance tensor (Z) is frequency dependent and is obtained from vector measurements of the electrical and magnetic fields. The AMT method measures both orthogonal magnetic and electrical fields (Hx, Hy, Ex,and Ey) so that the impedance can be described as a complex tensor to account for anisotropy.
Atmospheric sources for audio-magnetotelluric (AMT) sounding
https://www.complete-mt-solutions.com/wp-content/uploads/2018/05/GarciaJones_2002_Geophysics.pdf
Atmospheric sources for audio-magnetotelluric (AMT) sounding Xavier Garcia⁄and Alan G. Jonesz ABSTRACT The energy sources for natural-source magnetotel- luric (MT) frequencies>1 Hz are electromagnetic (EM) waves caused by distant lightning storms and which propagate within the Earth–ionosphere waveguide.
Atmospheric sources for audio-magnetotelluric (AMT) …
https://www.researchgate.net/publication/228976287_Atmospheric_sources_for_audio-magnetotelluric_AMT_sounding
The high-frequency MT method, called audiomagnetotel- lurics (AMT), has recently seen widespread application for problems related to imaging the conductivity structure within the accessible part of...
Audio-Magnetotelluric Methods in Reconnaissance …
http://geology.isu.edu/Geothermal/References/Conference-Symposium/Hoover_and_Long_1975_Conf.pdf
An audio-magnetotelluric (AMT) system has been devel oped by the U.S. Geological Survey for low-cost reconnais sagce exploration of geothermal regions. This is an electro magnetic sounding technique in which the scalar or Cagniard resistivity is computed at 12 frequencies logarithmically spaced from . 7.~ to . J. 8 600 Hz.
Audio-magnetotelluric survey to characterize the …
https://www.usgs.gov/node/92692
To help characterize the size, resistivity, and skin depth of the polarizable mineral deposit concealed beneath thick overburden, a regional east-west audio-magnetotelluric sounding profile was acquired. The purpose of this report is to release the audio-magnetotelluric sounding data collected along that east-west profile.
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