Structural characteristics of the Qena Bend of the Egyptian Nile River, using remote-sensing and geophysics

Beshr, Ahmed M.; Mohamed, Adel K.; ElGalladi, Ahmed; Gaber, Ahmed; El-Baz, Farouk

doi:10.1016/j.ejrs.2021.11.005

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…The rst two faults can be detected in lines P1 to P4, trending NW-SE. The western fault in the west coincides with the one detected in the geomagnetic studies of 49,52,56,70,71 . The displacement of this fault is about 14 m. The fault in the east causes a sudden decrease in the second layer thickness and the third layer depth.…”

Section: Resultssupporting

confidence: 77%

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Investigation of the shallow bedrock using the seismic refraction method – A case study in New Qena City, Eastern Desert, Egypt

Gowad,

El-Haddad,

Aglan

et al. 2023

Preprint

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The seismic refraction technique has demonstrated its efficiency as a cost-effective geophysical approach for bedrock investigation, which is very important for major construction projects. In the southern part of New Qena City, in the Eastern Desert of Egypt, construction of many domestic facilities is planned. Therefore, a prior investigation focusing on bedrock is required to validate the site for construction and other projects. In this study, a site investigation of the southern part of New Qena City is conducted using the seismic refraction method to estimate the depth and thickness of the bedrock and to present the subsurface structural features affecting the area. Ten seismic refraction profiles were measured, and the data were used for tomographic inversion. The results revealed a three-layered subsurface, with the bedrock represented by the mudstone unit of the Pliocene Durri Formation. This layer is located at a shallow depth and exhibits relatively low velocities as well as lateral velocity variations. This is attributed to the clay content of the layer, the high degree of fracturing, and the lateral facies variation. Therefore, the layer could undergo geotechnical problems that could affect future construction projects in the area. Four subsurface faults were also detected in the velocity sections.

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Section: Resultssupporting

confidence: 77%

“…In addition, prior information regarding the structural features in the shallow subsurface is also vital. Previous magnetic investigation shows that the region might be impacted by multiple faults 49,52,56,70,71 . These studies con rmed a NW-SE fault running through area, perpendicular to Qena-Safaga Road (Fig.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the shallow bedrock using the seismic refraction method – A case study in New Qena City, Eastern Desert, Egypt

Gowad,

El-Haddad,

Aglan

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Potential field data is subjected to 2D forward modeling in order to obtain a geological image of the basement, integrating depth and density. There have been a number of research (Mickus, 2008;Sayed and Aboud, 2012;Beshr et al, 2021;Alencar et al, 2022) that demonstrate the significance of two-dimensional modeling in the establishment of basement structures. 2D gravity modeling visualizes the Bahira basin structure in the current research.…”

Section: D Forward Modelingmentioning

confidence: 99%

Application of enhanced methods of gravity data analysis for mapping the subsurface structure of the bahira basin in Morocco

et al. 2023

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Gravity-based imaging of the subsurface has increased worldwide recently. Improvements in the processing and analysis of gravity data have allowed us to locate the basement surface, map geologic basins, and define structural patterns. In this study, gravity data were analyzed to study the Bahira basin’s underlying geology. The Bahira basin is very important economically. The Ganntour plateau is distinctive due to the importance of the phosphate mining resources. Using gravity data, we mapped the subsurface and determined the underlying structural patterns that affect the study area. In this study, we used several techniques to edge detection including Total horizontal derivative (THDR), first vertical derivative (FVD), tilt derivative (TDR), and its horizontal derivative (THDR_TDR) methods. Accordingly, the geological history of the Bahira basin suggests that the main lineaments/faults trends are NE-SW, NW-SE, ENE-WSW, and WNW-ESE. The 3D Euler deconvolution showed the depth and location of lineaments/faults, and matched edge detection results. The eastern Bahira basin’s sedimentary layer is 2–8 km deeper according to the Euler technique. Two-dimensional forward modeling along three profiles in the Bahira basin revealed a horst-graben basement structure. The outcomes of this study improved the subsurface topographical variations of the Bahira Basin. The information collected so far can help future studies in the area.

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“…In addition, prior information regarding the structural features in the shallow subsurface is also vital. Previous magnetic investigation shows that the region might be impacted by multiple faults (El-Akraby 1991; Mesbah et al 1996;Galal 2005;Beshr et al 2021;Alkholy et al 2023). These studies con rmed a NW-SE fault running through area, perpendicular to Qena-Safaga Road (Fig.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the shallow bedrock using the seismic refraction method – A case study in New Qena City, Eastern Desert, Egypt

Gowad,

El-Haddad,

Aglan

et al. 2023

Preprint

View full text Add to dashboard Cite

The seismic refraction technique has demonstrated its efficiency as a cost-effective geophysical approach for bedrock investigation, which is very important for major construction projects. In the eastern part of New Qena City, along Qena-Safaga Road in the Eastern Desert of Egypt, construction of many domestic facilities is planned. Therefore, a prior site investigation focusing on bedrock is required to validate the site for construction and other projects. In this study, a site investigation of the eastern part of New Qena City is conducted using the seismic refraction method to estimate the depth and thickness of the bedrock and to present the surface structural features affecting the area. Ten seismic refraction profiles were measured in the area. The results of tomographic modeling show that the bedrock consists of three layers, with the bedrock represented by the mudstone unit of the Pliocene Durri Formation. This layer is located at a shallow depth and varies in thickness in the area. The seismic velocity sections show that the layer is characterized by relatively low velocities as well as lateral velocity variations. This is interpreted to be due to the clay content of the layer, the high degree of fracturing, and the lateral facies variation. Therefore, the layer could undergo geotechnical problems that could affect future construction projects in the area. Four subsurface faults were also detected in the velocity sections created by the tomographic inversion.

show abstract

Structural characteristics of the Qena Bend of the Egyptian Nile River, using remote-sensing and geophysics

Cited by 8 publications

References 19 publications

Investigation of the shallow bedrock using the seismic refraction method – A case study in New Qena City, Eastern Desert, Egypt

Investigation of the shallow bedrock using the seismic refraction method – A case study in New Qena City, Eastern Desert, Egypt

Application of enhanced methods of gravity data analysis for mapping the subsurface structure of the bahira basin in Morocco

Investigations of the shallow bedrock using the seismic refraction method – A case study in New Qena City, Eastern Desert, Egypt

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