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2-D inversion of VES data in Saqqara archaeological area, Egypt


The interpretation of actual geophysical field data still has a problem for obtaining a unique solution. In order to investigate the groundwater potentials in Saqqara archaeological area, vertical electrical soundings with Schlumberger array have been carried out. In the interpretation of VES data, 1D resistivity inversion has been performed based on a horizontally layered earth model by El-Qady (1995). However, some results of 1D inversion are not fully satisfied for actual 3D structures such as archaeological tombs. Therefore, we have carried out 2D inversion based on ABIC least squares method for Schlumberger VES data obtained in Saqqara area. Although the results of 2D cross sections were correlated with the previous interpretation, the 2D inversion still shows a rough spatial resistivity distribution, which is the abrupt change in resistivity between two neighboring blocks of the computed region. It is concluded that 3D interpretation is recommended for visualizing ground water distribution with depth in the Saqqara area.


  1. Akaike, H., Likelihood and Bayes procedure, in Bayesian Statistics, edited by J. M. Bernardo, et al., pp. 143–166, Univ. press, Valencia, Spain, 1980.

    Google Scholar 

  2. Constable, S., L. Robert, and C. Constable, Occam’s inversion: A practical algorithm for generating smooth models from EM sounding data, Geophysics, 52(3), 289–300, 1987.

    Article  Google Scholar 

  3. El-Qady, G., Geophysical study for Saqqara area, M.Sc. Thesis, Fac. Sc. Mansoura Univ., Mansoura, Egypt, 1995.

    Google Scholar 

  4. Jackson, D. and M. Matsura, A Baysein approach to a nonlinear inversion, J. Geophys. Res., 90(B1), 581–591, 1985.

    Article  Google Scholar 

  5. Said, R., Subsurface geology of Cairo area: Memories de L., Inst. D’Egypte, Tome soxante, Le Caire, 70 pp., 1975.

    Google Scholar 

  6. Said, R., The Geology of Egypt, 734 pp., Balkema Pub., Roterdam, Netherlands, 1990.

    Google Scholar 

  7. Sasaki, Y., Automatic interpretation of resistivity sounding data over two dimensional structures (I), Geophys. Explor. of Japan (Butsuri Tanko), 34, 341–350, 1981 (in Japanese).

    Google Scholar 

  8. Strenberg, B. K., Electrical resistivity of the crust in the southern extension of the Canadian Shield—layered earth models, J. Geophys. Res., 84, 212–228, 1979.

    Article  Google Scholar 

  9. Uchida, T., Two-Dimensional resistivity inversion for Schlumberger sounding, Geophys. Explor. of Japan (Butsuri Tansa), 44(1), 1–17, 1991.

    Google Scholar 

  10. Uchida, T., Smooth 2-D inversion for Magnetotelluric Data Based on Statistical Criterion ABIC, J. Geomag. Geoelectr., 45, 841–858, 1993.

    Article  Google Scholar 

  11. Vozoff, K. and D. Jupp, Joint invesrion of geophysical data, Geophys. J. R. Astr. Soc., 42, 977–991, 1975.

    Article  Google Scholar 

  12. Zohdy, A. R., A new method for the automatic interpretation of Schlumberger and Wenner sounding curves, Geophysics, 54(2), 245–253, 1989.

    Article  Google Scholar 

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Correspondence to Gad El-Qady.

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El-Qady, G., Sakamoto, C. & Ushijima, K. 2-D inversion of VES data in Saqqara archaeological area, Egypt. Earth Planet Sp 51, 1091–1098 (1999).

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  • Apparent Resistivity
  • Vertical Electrical Sounding
  • Smoothing Factor
  • Schlumberger Array
  • Vertical Electrical Sounding Data