1887

Abstract

Summary

Far from its sources and in the presence of conductivity variations in the ground, the vertical and horizontal components of the VLF magnetic field can be linked by a linear equation: H_z=AH_x+BH_y.

The components A and B are called the tipper vector and inform us about the ground conductivity changes. By mounting an ADU data logger and a SHFT antenna from Metronix geophysics on a homemade trolley, we investigate the possibility of profiling and mapping with the tipper vector. We carried out a survey with seven profiles on a site next to Reims in France. The low electromagnetic pollution of the area allow us to record many VLF frequencies (nine) and to run many tests, considering the direction of the various VLF sources. Finally, after choosing two frequencies, we calculated the tipper vector on the whole survey area. The first results show a good spatial resolution and a strong capability of detection. We were able to precisely map a buried pipe. Moreover, the comparison with a magnetic map showed a very good fit between the data.

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/content/papers/10.3997/2214-4609.201701118
2017-06-12
2019-12-12
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References

  1. Bernard, J. and Valla, P.
    , [1991] Groundwater exploration in fissured media with electrical and VLF methods. Geoexploration, 27, 81–91.
    [Google Scholar]
  2. McNeill, J.D. and Labsen, V.F.
    , [1991] Geological mapping using VLF radio fields. In Nabighian, M.N., (Ed.), Electromagnetic methods in applied geophysics: part B, Application, 521–640.
    [Google Scholar]
  3. Paal, G.
    , [1965] Ore prospecting based on VLF-radio signals. Geoexploration, 3, 139–147.
    [Google Scholar]
  4. Pedersen, L.B. and Oskooi, B.
    , [2004] Airborne VLF measurements and variations of ground conductivity: a tutorial. Surveys in Geophysics, 25, 151–181.
    [Google Scholar]
  5. Guerin, R. and Benderitter, Y.
    , [1995] Shallow karst exploration using MT VLF and DC resistivity methods. Geophysical prospecting, 43(5), 635–653.
    [Google Scholar]
  6. Tezkan, B., Eröss, R., Bergers, R. and Stoll, J.
    [2012] First very low frequency measurements using an unmanned aircraft system: a feasibility study. 21th Electro-Magnetic Induction Workshop (EMIW), July 25–31, Darwin, Australia, 3 pages.
    [Google Scholar]
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