Earth Planets Space, Vol. 51 (No. 10), pp. 1091-1098, 1999
Gad El-Qady, Chika Sakamoto, and Keisuke Ushijima
Engineering Geophysics, Faculty of Engineering, Kyushu University, 36 Hakozaki, Fukuoka 812-8581, Japan
(Received October 14, 1998; Revised August 16, 1999; Accepted August 23, 1999)
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.