Magnetic survey for delineating subsurface structures and estimating magnetic sources depth, Wadi Fatima, KSA

Al‐Garni, Mansour A.

doi:10.1016/j.jksus.2010.02.005

Cited by 21 publications

(5 citation statements)

References 14 publications

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“…These changes are appeared on the RTP magnetic map (Figure 5). The density and shape of the magnetic contour lines reflect these changes [19]. Therefore, the subsurface structural trends of the basement structures can be visually traced on the RTP map.…”

Section: Quantitative Interpretationmentioning

confidence: 99%

Magnetic Applications to Subsurface and Groundwater Investigations: A Case Study from Wadi El Assiuti, Egypt

Mohamed¹,

Ella²

2021

IJG

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Wadi El Assiuti represents a promising area for agricultural development and building new communities far from the overpopulated areas in the Nile Valley. An integrated approach of satellite-based data and geophysical data with borehole data was used for defining the area of interest, the sediment thickness, delineating the subsurface structures, and mapping the depth to the basement rocks, and defining the groundwater aquifers. Findings are: 1) Dramatic changes are detected in the anthropogenic activities at the entrance area of the wadi, making stress and heavy exploitation of the groundwater resources. However, the central and northeastern regions show no development; 2) Several structural trends in the directions of NNW, NW, NE, and E-W are cutting the basement rocks and sedimentary cover; 3) The depth to the basement rocks is increasing eastward from ~2.24 km to ~4.84 km; 4) Three groundwater-bearing reservoirs are represented by the shallow Quaternary, the fractured limestone, and the deep Nubian sandstone aquifers; 5) The deep-seated faults are affecting the area and rising groundwater from the deeper Nubian aquifer along its sub-vertical trend; and 6) The results are informative and used to define the suitable sites for water well drilling.

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Section: Quantitative Interpretationmentioning

confidence: 99%

Magnetic Applications to Subsurface and Groundwater Investigations: A Case Study from Wadi El Assiuti, Egypt

Mohamed¹,

Ella²

2021

IJG

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“…To distinguish the near surface structures from the deeper ones and determine the magnetic source parameters, in particular locations of boundaries and depths, we applied different filtering techniques based on the derivatives of the magnetic data [Salem et al, 2008;Al-Garni 2010;Saada, 2015] through the Geosoft Oasis Moantaj Viewer software [Geosoft, 2018]. These techniques allow to separate the contribution of the different magnetic sources and hence, to better clarify their relationships.…”

Section: Magnetic Signatures Of Subsurface Faultsmentioning

confidence: 99%

Magnetic signatures of subsurface faults on the northern upper flank of Mt Etna (Italy)

Napoli

Currenti²,

Sicali³

2021

Annals of Geophysics

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A ground magnetic study was performed on the northern upper flank of Mt. Etna to provide new insights into subsurface volcano-tectonic structures. The high resolution magnetic survey was focused on the main structures of Piano delle Concazze, a large flat area dominated by the North- East crater and bounded by the rim of the Valle del Leone depression and the extremity of the North- East Rift. More than 2,500 measurements were gathered with a sampling step of about 3 m covering an area of about 0.2 km2. The total-intensity anomaly field shows the presence of intense South- North aligned maxima related to shallow geological structures affecting this area. Filtering techniques and 2.5D modeling have been applied for the determination of the magnetic source parameters. In order to distinguish the near surface structure, filters of the vertical derivatives, Butterworth high-pass and the tilt derivative were used. The 3D Euler deconvolution has been applied to estimate the depth and the structural indices of the causative sources. The calculated structural indices, that express the geometrical nature of the source, are in agreement with forward modeling. They show that the area is mainly affected by subvertical normal fault and the estimated depth of magnetic sources ranges between 10 m and 40 m. Our total field magnetic survey shows that characteristic magnetic anomalies are related to fault zones in the Piano delle Concazze that are well consistent with the local tectonics. The subsurface structures that have been detected allowed to delineate the general structural framework of the area. In particular, it was possible to clarify that these structures seem to be not deep rooted and consequently they can hardly act as preferential pathways for magma ascent.

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“…The study area is the present University of Ilorin, main campus which is located within latitude 8°27ˊ00ˊˊ N and 8°30ˊ00ˊˊ N and longitudes 4°38ˊ00ˊˊ E and 4°45ˊ00ˊˊ E on a scale of 1:50000 (Fig-2). It covers a total area of about 75.264 km 2 . Some neighbouring settlements around University of Ilorin include Olokobiri, Aiyereke-Ile, Atere, Agunbiade, Bada, Alaya, Isokun, Agbada, Jibowu, Folawiyo-Folatere, Jalala Agogo, Bolorundoro, Tanke Oke-Odo.…”

Section: Location and Geological Settingsmentioning

confidence: 99%

“…Thus, groundwater in a Basement Complex terrain is tending towards zero or minimal because this is only confined to fractured, weathered/regolith zones within this rock. In Basement Complex terrain, groundwater potential depends on the thickness of the weathered/fractured layer [2]. The overburden has high porosity and contains some quantities of water but with low permeability due to high clay content [3].…”

Section: Introductionmentioning

confidence: 99%

2-D Electrical Resistivity Tomography for Groundwater Potential in Basement Terrain of a Part of Ilorin Sheet 223 NW Nigeria

Aromoye¹,

Alimi²,

Bello³

et al. 2019

SJET

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In aiming to provide an economical supply of potable water for the inhabitant of University of Ilorin and its environs, 2-D Electrical Resistivity Tomographic development was adopted. A 2-D Electrical Resistivity Tomographic Techniques involves the application of gridded Wenner electrode arrangement in determining the variation of subsurface resistivity distribution. The surveying were carried out on field by employing 7 profiles containing 22 layouts all together with a constant surveying lengths of 150 m. The data obtained on field were inverted to obtain a pseudo-section where clearer models of the depth and apparent formation resistivity can be viewed at the same time using EarthImager Software. Three geo-electric layers were delineated which are Top soil, weathered/fractured Basement and fresh Basement. Out of the 7 profiles obtained the fresh Basement rock was only seen at profile F-F' having resistivity values ranging from 2000.1 to 10000 Ωm. The thickness of the weathered/fractured basement (aquifer) is generally greater than 22.0 m and with a low resistivity values which are less than 30 Ωm at some zones. In conclusion, this study shows some levels of confidence that the groundwater potential within Unilorin substratum is of economic volume that is capable to sustain Unilorin and its environs.

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Magnetic survey for delineating subsurface structures and estimating magnetic sources depth, Wadi Fatima, KSA

Cited by 21 publications

References 14 publications

Magnetic Applications to Subsurface and Groundwater Investigations: A Case Study from Wadi El Assiuti, Egypt

Magnetic Applications to Subsurface and Groundwater Investigations: A Case Study from Wadi El Assiuti, Egypt

Magnetic signatures of subsurface faults on the northern upper flank of Mt Etna (Italy)

2-D Electrical Resistivity Tomography for Groundwater Potential in Basement Terrain of a Part of Ilorin Sheet 223 NW Nigeria

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