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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. The energy discharged by lightning radiates EM fields that propagate great distances.
Audio-magnetotelluric methods in reconnaissance geothermal ...
https://pubs.er.usgs.gov/publication/70043033
An audio-magnetotelluric (AMT) system has been developed by the U.S. Geological Survey for low-cost reconnaissance exploration of geothermal regions. This is an electromagnetic sounding technique in which the scalar or Cagniard resistivity is computed at 12 frequencies logarithmically spaced from 7.5 to 18 600 Hz. Our system uses natural source fields except at the two upper …
Audio-magnetotelluric methods in reconnaissance geothermal ...
https://pubs.er.usgs.gov/publication/ofr75362
Superseding Publications: Audio-magnetotelluric methods in reconnaissance geothermal exploration (1976) The Publications Warehouse does not have links to digital versions of this publication at this time. Download citation as: RIS | Dublin Core.
Audio-magnetotelluric survey to characterize the …
https://www.usgs.gov/node/92692
Audio-magnetotelluric survey to characterize the Sunnyside porphyry copper system in the Patagonia Mountains, Arizona January 3, 2011 The U.S. Geological Survey is conducting a series of multidisciplinary studies as part of the Assessment Techniques for Concealed Mineral Resources project.
Audio-Magnetotelluric Methods in Reconnaissance …
http://geology.isu.edu/Geothermal/References/Conference-Symposium/Hoover_and_Long_1975_Conf.pdf
Audio-Magnetotelluric Methods in Reconnaissance Geothermal Exploration D. 8. HOOVER C. L. LONG . US. Geological Survey, Branch of Theoretical and Applied Geophysics, Denver Federal Center, Denver, Colorado 80225, USA. ABSTRACT . An audio-magnetotelluric (AMT) system has been devel oped by the U.S. Geological Survey for low-cost reconnais
Audio-magnetotelluric (AMT) study to investigate the ...
https://aip.scitation.org/doi/abs/10.1063/1.4990913
Lap T T, Xue C, Wei A, Liu LV, Li W, Hu Q, Li J, Luo D, Zhu S and Zhung T 2014 Application of Audio-Magnetotelluric Method for Exploration the Concealed Ore-Bodies in Yuele Lead-Zinc Ore Feild, Daguan County, NE Yunnan Province, China Journal of Geoscience and Environment Protection vol.2 pp. 35– 45.
AUDIO MAGNETOTELLURIC SIGNAL-NOISE …
https://www.worldscientific.com/doi/10.1142/S0218348X19400073
To avoid the blindness of the overall de-noising method and retain useful low frequency signals that are not over processed, we proposed a novel audio magnetotelluric (AMT) signal-noise identification and separation method based on multifractal spectrum and matching pursuit.
Application of audio-magnetotelluric method to cover ...
https://www.tandfonline.com/doi/pdf/10.1080/22020586.2019.12073059
the application of the audio-magnetotelluric (AMT) technique to cover thickness estimation using deterministic and stochastic inversion approaches. The deterministic Occam’s inversion method solves the regularised problem by searching for the smoothest model that fits the data within certain tolerances. ...
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