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- Description10.------------------------, 10.------------------------. N:: IE w ' '0.1 \ 0 M z SIDE VIEW PLAN VIEW 0.01 LI --'---'---LLL-'---LLLlI -L--- ---LLL..ll..L.LJ'-': ';;' 0.01 1 100 10 100 fr Fig. 1. The behavior of the magnetic and electric fields from a vertical magnetic dipole source at the surface of the earth (after Wait [1951,1955]). earth, the experimental curve so plotted should have the same shape as a portion of the ap propriate theoretical curve, but with the ordinates and abscissas shifted by an amount dependent on the resistivity. The conductivity can be determined from the amount of shift between the field data and the theoretical curve. A detailed description of the curve matching procedure is found in a text by Keller and Frischknecht (1966). The curve matching procedure, though used, has several disadvantages. Measurements must be made over a diagstic portion of the theoretical curve, one in which there is some curvature, so that the amount of shift required to make a match can be determined uniquely. This means that the approximate conductivity of the earth must be kwn when measurements are made. Secondly, determination of a single value of conductivity requires measurements made over a wide range of frequencies. This would appear to be wasteful of data, inasmuch as the equations indicate that a single measurement at a single frequency should be eugh to de termine conductivity.
- Author(s)L L Vanyan
- Date of Publication04/04/2012
- FormatPaperback / softback
- Country of PublicationUnited States
- Content Noteblack & white illustrations, bibliography
- Weight730 g
- Width210 mm
- Height279 mm
- Spine17 mm
- Format DetailsTrade paperback (US),Unsewn / adhesive bound
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