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Apparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests
  • Published Date:
    1984
  • Language:
    English
Filetype[PDF - 976.98 KB]


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  1. Apparent Earth Conductivity Over Coal Mines as Estimated From Through-the- Earth Electromagnetic Transmission Tests - RI 8869
    Personal Author:
    Durkin, John
    Published:
    1/1/1984
    Description:
    Electromagnetic narrow-band signals were transmitted through the earth at 27 coal mines located throughout the United States. From those Bureau of Mines tests, apparent earth conductivity values were derived based upon a homogeneous half-space model ...
    File Type:
    Filetype[PDF - 976.98 KB]
  2. Earth Conductivity Estimation from Through-the-Earth Measurements of 94 Coal Mines Using Different Electromagnetic Models
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    Appl Comput Electromagn Soc J. 2014; 29(10):755-762.
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  3. Spectrum Measurements Of Electromagnetic-Noise In Coal Mines; Proceedings Of Thru-The-Earth Electromagnetics Workshop
    Personal Author:
    Bensema, W. D.; Adams, J. W.;
    Published:
    1/1/1973
    Description:
    A portable, multichannel battery-operated mine-permissible measurement system was developed to measure the rms magnetic-field noise spectrum in the frequency range from 100 Hz to 375 kHz. During each measurement, the entire spectrum is measured simul...
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    Kanda, M.; Adams, J.W.;
    Published:
    1/1/1973
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    A system for measuring amplitude probability distributions (APD’s) of electromagnetic noise in coal mines is described and typical APD’s from an underground coal mine are presented. The APD is a basic statistic required for the design and analysi...
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  5. Adaptive-Noise-Cancellation Techniques For Through-The-Earth Electromagnetic, Volume III
    Personal Author:
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    Published:
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    An electromagnetic (EM) system for the location of trapped mine workers at coal-mine (300 m) depths has been developed. The use of such a system in deep mines (1-km depth) requires transmission at extremely low frequencies (ELF) and a reduction in th...
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