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The importance of studying the induced polarization effect results from a wide prevalence of this effect in various geological media and its essential influence on the results of practically all EM studies. Often it is very hard to diagnose the IP effects from TEM field data. The exceptions are cases of very intense manifestations of the polarization at low levels in induction processes when the observed signals more than once invert their sign. As an example of IP effect we present here the results of the research performed by TEM and DC method carried out on the Sphinx-pyramid Chephren area. The purpose of the research was to evaluate the configuration of aquifers and groundwater reservoirs. The studies started initially as purely geological, however, led to unexpected result: between the famous objects the Sphinx, Cheops and Chephren pyramids, a region with abnormally high electrical conductivity have been found. Conventionally, this region was believed associated with cavities in limestone formations of the Giza plateau that contain mineralized water and have rather low resistivity. In 2000 deep underground galleries were discovered at this site. Intensive IP effect was revealed near the Chephren pyramid where according the TEM-FAST measurements the local fault does exist.

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