Active tectonic structures in northeastern Egypt: a geospatial analysis using structural, remote sensing, and seismic data

Hagag, Wael; Hassan, Safaa M.; Toni, Mostafa

doi:10.1007/s12517-019-4749-6

Cited by 9 publications

(3 citation statements)

References 38 publications

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“…The crustal motions between the Arabian plate, African plate, and Sinai subplate result in a high seismicity rate in the SGZ zone. The high seismic activity of the AQ zone is attributed to the Gulf of Aqaba's left-lateral strikeslip movement (Ben-Avraham 1985;Toni 2012;Toni et al, 2016Toni et al, , 2019aBadreldin et al 2019;Hagag et al 2019). Abdel-Rahman et al (2009) reported that recent earthquakes all over the Sinai Peninsula are larger than historical ones, which agrees with the region's neotectonic reactivation models.…”

Section: Resultsmentioning

confidence: 63%

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

2022

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The Sinai Peninsula is a subplate located between the African and Arabian plates. It is an important subplate in the world; however, this region is poorly understood because of the shortage of geophysical data. Thus, this study focuses on built a three-dimensional (3D) high-resolution forward model of the crustal thickness with a new tectonic model and structural evaluation of the Sinai Peninsula to understand this area tectonically and determine its lithospheric and crustal thicknesses. Qualitative and quantitative interpretations of Bouguer gravity, reduced-to-the-pole (RTP) aeromagnetic, and earthquake data are explained to achieve the goals of this study. Two-dimensional (2D) interactive sequential modeling of gravity data is performed along with some well-selected profiles with existing crustal layer depth points from previous works in the studied region. Seventeen 2D models are constructed and used to determine the basement, Conrad (lower crust boundary), and Moho (upper mantle boundary) depths and to build a 3D model. Accuracy of the 3D built model is evaluated by extracting observed, calculated, and residual gravity anomaly maps. The results show that the basement rocks appear on the surface in the South of Sinai and deepen (down to 4.5 km) toward the North. The Conrad surface varies approximately from 16 km (in the northeast and southwest of Sinai) to 22.8 km (in the southeast). The Moho surface depth (i.e., crustal thickness) varies approximately from 28.8 to 34.2 km, and it deepens toward the northeastern and southwestern parts of Sinai. A tentative basement structure map is constructed from the horizontal gradient (H-gradient) filter and the 3D Euler deconvolution of the Bouguer gravity and RTP aeromagnetic data. Correlation between the geological background of the study area and the obtained results suggests that the Sinai Peninsula is tectonically active, mainly in its southern portion due to the tectonic movements along the Gulf of Suez and the Gulf of Aqaba. The crustal thickness increases southward and thins northward.

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Section: Resultsmentioning

confidence: 63%

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

2022

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“…Rock formations from the Upper Eocene to the Miocene have experienced multiple tectonic deformations [64]. These deformations produced different structural ridges and basins with various fault mechanisms and geospatial distribution [70][71][72]. The high topographic representations in the study area occur in association with the Upper Eocene rocks in the south of the study area along Ain As Sokhna Suez road.…”

Section: Study Areamentioning

confidence: 99%

“…Between these major structural ridges, three tectonic fault trends exist that are north-northwest, northwest, and east-northeast (Figure 5). All of these faults are normal faults, and their faulting criteria include steep dipping planes and high throws [71,72,82], producing structural ridges and basins with distinctive topography throughout the study area (Figure 5). The orientation of normal faults and the geospatial characteristics of their structural ridges and basins represent the principal driving forces that develop watersheds and their associated stream networks (Figure 5).…”

Section: Regional and Morphologic Setting Of The Study Areamentioning

confidence: 99%

The Interplay between Spatial Urban Expansion and Morphologic Landscapes East of Cairo, Egypt Using Time Series Satellite Imagery

Shalaby

Hermas

Khormi

et al. 2022

IJGI

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This study aims to monitor the magnitudes, rates, and directions of spatial urban expansions east of Cairo and their interactions with the initial morphologic landscapes. The approach relies on using CORONA satellite images acquired in 1969 with fine spatial resolution and time series images of Landsat and ASTER from 1984 to 2020. The CORONA images enable retrieval of the initial morphologic components, whereas the Landsat and ASTER images enable the spatial urban expansions to be mapped. The magnitudes of spatial urban expansions have been massive, in the order of 165 km2. These expansions have occurred through four main temporal phases with different spatial extents, rates, and directions in response to common urban policies and socioeconomic settings. Assessing the interactions between urban expansions and the morphology of watersheds in the study area indicates that the directions of urban expansion have been opposite to the geospatial orientations of the watersheds. In addition, significant urban areas in the order of ~8 km2 are under the direct threat of flash floods because they are misplaced within the valley floors of the studied watersheds. The study concludes that successful spatial urban expansion should consider the morphologic characteristics of the initial landscape for the purpose of maximizing interests and avoiding or reducing potential hazards against urban settlements.

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Seismicity and Seismotectonic of North Africa: An Updated Review

Toni,

Badreldin,

El Fellah

2024

Regional Geology Reviews

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Active tectonic structures in northeastern Egypt: a geospatial analysis using structural, remote sensing, and seismic data

Cited by 9 publications

References 38 publications

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

The Interplay between Spatial Urban Expansion and Morphologic Landscapes East of Cairo, Egypt Using Time Series Satellite Imagery

Seismicity and Seismotectonic of North Africa: An Updated Review

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