Geophysical survey for geological hazards assessment of Wadi Thuwal area, KSA: a case history

Al‐Garni, Mansour A.; El-Behiry, Mohamed G.; Gobashy, Mohamed

doi:10.1007/s12517-010-0147-9

Cited by 10 publications

(6 citation statements)

References 9 publications

(6 reference statements)

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“…This earthquake activity can be taken as indicator for tectonic activity of some recorded fault trends through this zone. The previous geological and geophysical investigations have confirmed the presence of major NE-SW and NNE-SSW fault trends through Wadi Thuwal area (Al-Garni et al [3]; Al-Garni and El-Kaliouby [2]). In addition, evidences of shear zones are observed close to Harrat Thuwal (Al-Garni and Gobashy 2009).…”

Section: Thuwal-rabegh Zonementioning

confidence: 72%

“…Depending on the distribution of earthquakes, fault parameters (strike and dip) of the major structural trend, seismicity parameters (a-and b-values, Table 1) and previous geological and geophysical studies (Alwash and Zakir [4]; Al-Qarni [5]; Al-Garni et al [3]; Al-Garni and El-Kaliouby [2]), five seismogenic source zones have been identified (Fig. 7).…”

Section: Seismotectonic Zonesmentioning

confidence: 99%

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Seismicity and seismotectonics of the Jeddah area, Saudi Arabia

Fnais¹,

Abdelrahman²,

E-Hady³

et al. 2013

WIT Transactions on the Built Environment

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The Jeddah area is located along the eastern coast of the Red Sea and hence has been affected by moderate to destructive earthquakes throughout its history. Consequently, the identification of the seismogenic source zones is of utmost importance for mapping the most disaster prone area around the Jeddah area. Available data, including both historical and instrumental have been collected from national and international data centers. The seismogenic source zones that might affect the Jeddah area are defined more precisely depending on the main tectonic trends; distribution of earthquakes, seismicity rate (a-and b-values) and a fault plane solution for the major earthquakes; in addition, the type of faults that prevail and characterize these zones. It is concluded that Jeddah city is outlined by five seismogenic source zones; three of them are located through the Red Sea (southwestern Jeddah, western Jeddah, and northwestern Jeddah), while the other two earthquake zones are located inland (Thewal-Rabegh and Jeddah-Makkah zones). The existence of microearthquakes inland suggests that there is a significant level of tectonic activity away from the axial trough of the Red Sea..These inland zones correlate well with the major active tectonic trends outlining the Jeddah area. The b-values range from 0.65 to 1.03 through the study area. An area of high b-values could be indicative of a relative low stress regime resulting from the stress release by the earthquakes. An area of low bvalues is interpreted as evidence of a relatively higher stress regime associated with an area of dominantly extensional stress. Due to this complicated tectonic setting and stress heterogeneities for the Jeddah area, detailed earthquake monitoring is highly recommended. These results are valuable for seismic hazard assessment of the Jeddah area for anti-earthquake structures of the developmental and urbanization projects.

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Section: Thuwal-rabegh Zonementioning

confidence: 72%

Section: Seismotectonic Zonesmentioning

confidence: 99%

Seismicity and seismotectonics of the Jeddah area, Saudi Arabia

Fnais¹,

Abdelrahman²,

E-Hady³

et al. 2013

WIT Transactions on the Built Environment

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“…It is implemented in many integrated studies aiming to delineate the structural setting (e.g. Abdelazeem et al, 2021;Araffa et al, 2021;Azeem et al, 2014;Al-Garni et al, 2012) and in groundwater studies (Gobashy et al, 2021b;Al-Garni et al, 2006) and exploration of the mineral (Gobashy et al, 2022;Gobashy et al, 2020;Gobashy et al, 2021a;Abdelrahman et al, 2019), groundwater contamination (Rehman et al, 2019).…”

Section: Magnetic Methodsmentioning

confidence: 99%

Geophysical studies to delineate groundwater aquifer in arid regions: A case study, Gara Oasis, Egypt

NAZIH

Gobashy

Araffa

et al. 2022

Contrib. Geophys. Geod.

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Groundwater is an important factor in establishing new urban communities, especially in coastal arid and semi-arid regions. Egypt is one of the world's driest countries, with hyper-arid territory accounting for 86% of the total area and arid and semi-arid terrain accounting for the rest. The present work aims to demonstrate the powerful integration of geophysical techniques to assess groundwater potentiality and suitability in Gara Oasis (GO), which describes a good example of Egypt's strategic southern extension of its arid north-western coast. Geophysical methods, including electrical resistivity and aeromagnetics, were used to evaluate groundwater resources. The study region reduced to pole total magnetic intensity map is subjected to digital filters that include derivatives, analytic signal, and tilt angle. The possible structures controlling the shallow and deep aquifers are delineated and integrated with geoelectric results. Moreover, two magnetic tomography sections are constructed to show the subsurface distribution of magnetic susceptibilities and formation boundaries. Ten vertical electric soundings (VESs) are measured and used in this study to construct four geoelectrical cross-sections. According to the results, Gara's commonly calculated subsurface resistivity model comprises six major resistivity layers. The 5th layer, in particular, is composed of Fractured dolomitic Limestone and represents a possible promising shallow aquifer. Moreover, as evidenced by various magnetic data filters, the shallow (Miocene carbonate) and deep (Nubian sandstone) aquifers are structurally controlled and regulated by a system of faults or contacts. These contacts trends NW–SE, E–W, and NE–SW as common trends emerged from the total derivative and tilt maps. Results suggest that the central part (N–S zone) together with the western side of Gara, have the most notable aquifer possibility demanded future improvement strategies.

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“…It is employed as an effective technique and has numerous geological uses, such as geologic mapping of potential locations with buried igneous bodies that are frequently linked with mineralization, identifying supra-basement features, and estimating the thickness of sedimentary cover 12 . Moreover, it is also the favourite for studying the tectonic structure, identification of intra-basement faults and uplifts, basin modelling, and structural geometry 13 – 16 , petroleum exploration modelling of geothermal and groundwater resources 17 – 19 , allowing the visualization of the geological structure of the upper crust, like faults, aids in the discovery of buried objects such as pipes, drums, and unexploded ordnance 20 . Furthermore, it aids in mineral exploration 13 , 16 , 18 , 21 – 30 .…”

Section: Introductionmentioning

confidence: 99%

Exploring gold mineralization in altered ultramafic rocks in south Abu Marawat, Eastern Desert, Egypt

Eldougdoug

Abdelazeem

Gobashy

et al. 2023

Sci Rep

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Gold mining is an important strategic sector. The search for mineral reserves is moving deeper as more accessible shallow resources are discovered. Geophysical techniques are now being employed more frequently in mineral exploration because they are quick and can provide crucial subsurface information for discovering potential metal deposits, particularly in high-relief and inaccessible places. The potential for gold in a large-scale gold mining (LSGM) locality in the South Abu Marawat area is investigated using a geological field investigation that includes rock sampling, structural measurements, detailed petrography, reconnaissance geochemistry, and thin section analysis, integrated with various transformation filters of surface magnetic data (analytic signal, normalized source strength, tilt angle), contact occurrence density maps, and tomographic modelling for the subsurface magnetic susceptibilities. The benefits of remote sensing (RS) and its technology in mapping detailed rock differentiation, and characterizing physical objects on the land surface using various spatial, and spectral resolution datasets are integrated. Both aeromagnetic and measured land magnetic profiles are used to investigate the area’s present geological conditions and possible future mining localities. Results indicate that gold mineralization in the study area is linked to the altered ultramafic zones that are associated with faulting and shearing and characterized by a low magnetic susceptibility anomaly.

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Geophysical survey for geological hazards assessment of Wadi Thuwal area, KSA: a case history

Cited by 10 publications

References 9 publications

Seismicity and seismotectonics of the Jeddah area, Saudi Arabia

Seismicity and seismotectonics of the Jeddah area, Saudi Arabia

Geophysical studies to delineate groundwater aquifer in arid regions: A case study, Gara Oasis, Egypt

Exploring gold mineralization in altered ultramafic rocks in south Abu Marawat, Eastern Desert, Egypt

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