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: http://geophys.geol.msu.ru/2d/ip2d_005.htm
Дата изменения: Mon Jun 28 15:51:31 1999 Дата индексирования: Mon Oct 1 19:51:14 2012 Кодировка: |
C-effect has several particularities, which do it more dangerous, than P-effect: a) The form of VES curve and consequently visible layers number changes; b) On profile VES data C-effect shows itself on Rhoa cross-section as dipping layer (fig.5b), and in the case of logarithmic scale along AO axis it seems to be bent layer. c) when standard sounding technology is used (four electrodes Schlumberger array and logarithmic step in distance growth), C-effect results from A and from B electrodes occasionally and irregularly only at the moments when current electrodes exactly hit NSI. In this case the main sign of C-effect - its form - disappears. Case C on fig.4 shows V-transformation for AMN array with logarithmic step in distance growth. C-effect in this case loose its regularity. d) On Rhoa cross-section C-effect is not distinctly visible due to great changes in Rhoa level with distances (fig.5a). To find and recognize C-effect the special technology of field measurements and results visualization is needed (V-transformation).