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The Audio-Magnetotelluric Method (AMT) - USGS
https://pubs.usgs.gov/of/2003/of03-056/html/AMTMdesc.htm
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 Magneto Telluric [AMT]
http://hephaestus.teikav.edu.gr/index.php/ct-menu-item-7/petroleum-engineering/222-amt-caamt
Audio Magneto Telluric [AMT] AMT is a higher-frequency magnetotelluric technique for shallower investigations. While AMT has less depth penetration than MT, AMT measurements often take only about one hour to perform (but deep AMT measurements during low-signal strength periods may take up to 24 hours) and use smaller and lighter magnetic sensors.
Audio-magnetotelluric investigation of ... - ScienceDirect
https://www.sciencedirect.com/science/article/pii/0899536292900199
Audio-magnetotelluric (AMT) soundings (frequency range 1–7500 HZ) were performed together with the systematic survey of the range (SNIM mining company). The non-linear least squares method was used to perform a smoothness-constrained data model. The obvious AMT resistivity contrasts between the M'Haoudat Unit (150–3500 ohm.
An automatic audio-magnetotelluric equipment, controlled ...
https://link.springer.com/article/10.1007/BF01465544
A campaign of audio-magnetotelluric soundings in the crater of Momotombo has shown that the structure of this volcano is suitable to a surveillance by this method; it has an only central activity, and the resistivity versus the depth decreases suddenly at least 100 times at about 270 m.
Application of Audio-Magnetotelluric Method for ...
https://www.scirp.org/journal/PaperInformation.aspx?PaperID=46757
The audio-megnetotelluric (AMT) surveying is an advantageous method to characterize the size, resistivity and skin depth of the polarizable mineral deposit concealed beneath thick overburden. This paper presents the surveying results using AMT method to evaluate the concealed lead-zinc mineralization in Yuele lead-zinc ore field, Daguancounty ...
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