3D inversion of VES data from the Saqqara archaeological area, Egypt: a case study

El-Qady, Gad; Santos, Fernando A. Monteiro; Hassaneen, A. Gh.; Trindade, L.

doi:10.3997/1873-0604.2005018

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…The 1-D interpretation of electrical and electromagnetic is suffering from high equivalence and low resistivity equivalence and layer suppression. Recently, numerous authors addressed the multidimensional inversion of geoelectrical data (e.g., EL-QADY et al, 2005;SASAKI and MEJU, 2006), but it is not always possible to collect a dense data set for such inversions. Therefore 1-D inversion is favorable in many case studies for simplicity and reconnaissance purposes.…”

Section: Resultsmentioning

confidence: 99%

Delineation of Shallow Subsurface Structure by Azimuthal Resistivity Sounding and Joint Inversion of VES-TEM Data: Case Study near Lake Qaroun, El Fayoum, Egypt

Massoud

El-Qady

Metwaly

et al. 2009

Pure appl. geophys.

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An azimuthal resistivity survey was conducted at the transition zone between the desert area and the cultivated land near Lake Qaroun, Egypt. This area has been affected by an east-west trending fault system as indicated from the surface geology. Apparent resistivity values were plotted along azimuth on a polar diagram. Resistivity anomalies, for most of the AB/2 values with long axes strike in a direction parallel to the contact between the desert and cultivated lands, indicate the presence of electrical macro-anisotropy, mainly due to the faulting effect, at this area. Vertical electrical soundings (VES) and transient electromagnetic (TEM) measurements were conducted at eight stations along a line that crosses the boundary between the desert and cultivated land. Joint inversion of VES-TEM data was successfully used for identification of the subsurface lithostratigraphic succession and demonstrated the effect of the fault zone on the investigated subsurface medium. Apparent anisotropy coefficients at all current electrode spacings were calculated, plotted against AB/2 values and compared with the geoelectrical cross section. The effect of the fault zone was detected at AB/2 spacings equal to 100 m and extended downward and is largely related to the depth of the fault, as indicated in the constructed cross section.

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Section: Resultsmentioning

confidence: 99%

Delineation of Shallow Subsurface Structure by Azimuthal Resistivity Sounding and Joint Inversion of VES-TEM Data: Case Study near Lake Qaroun, El Fayoum, Egypt

Massoud

El-Qady

Metwaly

et al. 2009

Pure appl. geophys.

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“…for example, Meshref, 1990). Vertical Electrical Sounding (VES) carried out in the Saq qara area deiected large scale tectonic structores of downthrust type (El-Qady et al, 2005). Therefore, in some places within the Saqqara necropoiis the Cretaceous lime itones could have been accessible and mineable for ancient Egyp tians.…”

Section: Discussionmentioning

confidence: 99%

Preliminary Remarks on Enigmatic “White Casing Limestone” from Saqqara Archaeological Site in Egypt

Welc¹,

Malata²,

Marks³

et al. 2013

Studia Quaternaria

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Saqqara is one of the famous archaeological sites in the world. There is the oldest stone pyramid built by pharaoh Djoser from the Third Dynasty (around 4600 yrs BP). The components of his funerary complex were constructed of a characteristic creamish-white limestone of relatively great solidity, connected in archaeological literature with the white casing limestone from Saqqara. A source of this stone has remained so far a mystery. An extensive geological survey and other research has failed to identify any outcrops of such limestone in the vicinity of Saqqara. Preliminary results of examination of fossils from relevant rock samples of the white Saqqara limestone are presented, supple mented with discussion of current opinions concerning its origin and probable stratigraphic setting.

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“…Several authors have published examples of the applications of 3D inversion of DC resistivity data. El-Qady et al (2005), Sultan et al (2006) and Ekinic and Kaya (2007) applied 3D inversion of resistivity data to archaeological investigations. Pidlisecky et al (2007) successfully developed an open source 3D resistivity inversion package.…”

Section: Introductionmentioning

confidence: 99%

Field test to compare 3D imaging capabilities of three arrays in a site with high resistivity contrast regions

Neyamadpour

2011

Stud Geophys Geod

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The applicability of three kinds of electrode configurations used to delineate a buried horizontal pipe was studied. A 3D resistivity imaging survey was carried out along eight parallel lines using pole-pole, pole-dipole, and dipole-dipole arrays with 1m minimum electrode spacings. Roll-along measurements were carried out to cover a rectangular grid. The 2D and 3D least squares algorithms based on the robust inversion method were used in the inversion of the apparent resistivity data sets. The 2D inversion of data sets could not delineate the orientation and dimension of the subsurface anomalies clearly. To obtain more accurate results, a 3D joint inversion of the pole-pole and pole-dipole data sets was performed, as well as of pole-pole and dipole-dipole data sets. In this case, both horizontal and vertical dimensions of subsurface structures were resolved. The resulting model obtained from each array was compared to those of joint inversion method. The result showed that the horizontal resolution does not improve so much as that in the vertical direction when joint inversion is applied.

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3D inversion of VES data from the Saqqara archaeological area, Egypt: a case study

Cited by 12 publications

References 14 publications

Delineation of Shallow Subsurface Structure by Azimuthal Resistivity Sounding and Joint Inversion of VES-TEM Data: Case Study near Lake Qaroun, El Fayoum, Egypt

Delineation of Shallow Subsurface Structure by Azimuthal Resistivity Sounding and Joint Inversion of VES-TEM Data: Case Study near Lake Qaroun, El Fayoum, Egypt

Preliminary Remarks on Enigmatic “White Casing Limestone” from Saqqara Archaeological Site in Egypt

Field test to compare 3D imaging capabilities of three arrays in a site with high resistivity contrast regions

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