Gravity and magnetic data inversion for 3D topography of the Moho discontinuity in the northern Red Sea area, Egypt

Prutkin, I.; Saleh, A.

doi:10.1016/j.jog.2008.12.001

Cited by 38 publications

(19 citation statements)

References 20 publications

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“…These models stimulated new studies of the crustal structure, particularly the determination of the Moho boundary in Egypt and surrounding areas (e.g., Azab et al, 2015;Cowie and Kusznir, 2012;Prutkin and Saleh, 2009;Salem et al, 2013;Sobh et al, 2016). The results obtained in these studies are very controversial.…”

Section: Introductionmentioning

confidence: 99%

Density structure and isostasy of the lithosphere in Egypt and their relation to seismicity

2018

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Abstract. A joint analysis of the new satellite-terrestrial gravity field model with recent data on the crustal structure and seismic tomography was conducted to create an integrative model of the crust and upper mantle and to investigate the relation of the density structure and the isostatic state of the lithosphere to the seismicity of Egypt. We identified the distinct fragmentation of the lithosphere of Egypt in several blocks. This division is closely related to the seismicity patterns in this region. The relatively dense and strong lithosphere in the Nile Delta limits the seismic activity within this area, while earthquakes are mainly associated with the boundaries of this block. In the same way, the relatively strong lithosphere in the Isthmus of Suez and northern Mediterranean prevents the Gulf of Suez from opening further. The central part of Egypt is generally characterized by an increased density of the mantle, which extends to the Mediterranean at a depth of 100 km. This anomaly deepens southward to Gilf Kebir and eastward to the Eastern Desert. The average density of the crystalline crust is generally reduced in this zone, indicating the increased thickness of the upper crust. The low-density anomaly under the northern Red Sea is limited to 100-125 km, confirming the passive origin of the extension. Most of the earthquakes occur in the crust and uppermost mantle in this structure due to the hot and weak upper mantle underneath. Furthermore, an asymmetric lithosphere structure is observed across the northern Red Sea. The isostatic anomalies show the fragmentation of the crust of Sinai with the high-density central block. Strong variations in the isostatic anomalies are correlated with the high level of seismicity around Sinai. This tendency is also evident in the northern Red Sea, east of the Nile Valley, and in parts of the Western Desert.

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Section: Introductionmentioning

confidence: 99%

Density structure and isostasy of the lithosphere in Egypt and their relation to seismicity

2018

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“…It has been applied in global studies when inverting gravity or magnetic data in terms of major interface surfaces in planetary bodies (Prutkin 1989(Prutkin , 2008. In regional studies it has been applied to invert gravity and magnetic data in order to determine the Moho boundary in the Red Sea area (Prutkin & Saleh 2009). The capabilities of the method for interpreting gravity data in local/regional structural studies were demonstrated also on the Kolárovo gravity high (Prutkin et al 2011).…”

Section: Inversion Methodsmentioning

confidence: 99%

“…The density contrast and the vertical position -depth D of the horizontal asymptotic plane -are pre-specified. The mathematical apparatus for this inversion procedure is described in detail in (Prutkin & Saleh 2009). The solution of our non-linear inversion can also consist of a combination of anomalous bodies and contact surfaces.…”

Section: Inversion By the Methods Of Local Correctionsmentioning

confidence: 99%

Joint interpretation of gravity and magnetic data in the Kolárovo anomaly region by separation of sources and the inversion method of local corrections

Prutkin¹,

Vajda²,

Bielik³

et al. 2014

Geologica Carpathica

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Abstract:We present a new interpretation of the Kolárovo gravity and magnetic anomalies in the Danube Basin based on an inversion methodology that comprises the following numerical procedures: removal of regional trend, depth-wise separation of signal of sources, approximation of multiple sources by 3D line segments, non-linear inversion based on local corrections resulting in found sources specified as 3D star-convex homogenous bodies and/or 3D contrasting structural contact surfaces. This inversion methodology produces several admissible solutions from the viewpoint of potential field data. These solutions are then studied in terms of their feasibility taking into consideration all available tectono-geological information. By this inversion methodology we interpret here the Kolárovo gravity and magnetic anomalies jointly. Our inversion generates several admissible solutions in terms of the shape, size and location of a basic intrusion into the upper crust, or the shape and depth of the upper/lower crust interface, or an intrusion into the crystalline crust above a rise of the mafic lower crust. Our intrusive bodies lie at depths between 5 and 12 km. Our lower crust elevation rises to 12 km with and 8 km without the accompanying intrusion into the upper crust, respectively. Our solutions are in reasonable agreement with various previous interpretations of the Kolárovo anomaly, but yield a better and more realistic geometrical resolution for the source bodies. These admissible solutions are next discussed in the context of geological and tectonic considerations, mainly in relation to the fault systems.

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“…An unknown 3D topography is determined by the equation z = z(x, y). We find an unknown function z(x, y) from the corresponding nonlinear integral equation of the 1st kind (Prutkin and Saleh, 2009). We can use gravity or magnetic data directly on the physical surface, approximation with 3D line segments is necessary only if we need to separate sources and estimate their depths.…”

Section: Inversion Algorithmsmentioning

confidence: 99%

Separation of sources and 3D inversion of gravity and magnetic data for the Thuringian Basin, Germany

Prutkin¹,

Jentzsch²,

Jahr³

2012

Contributions to Geophysics and Geodesy

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Abstract:We propose a novel methodology for separation of potential field sources and its 3D inversion. New approaches are developed to separate sources: i) in depth using a succession of upward and downward continuation; ii) in the lateral direction by means of approximation with the field of 3D line segments; iii) according to density and magnetization contrast based on pseudo-gravity calculation. Our original inversion algorithms allow the recovery of unknown 3D geometry both for a restricted body of arbitrary shape and for a contact surface. For the first time, we apply our algorithms to joint inversion of gravity and magnetic data for a large area (the Thuringian Basin in central Germany). We separate in depth sources of both gravitational and magnetic anomalies for the whole territory of Thuringia and compare corresponding components. A 3D model of the main sources is presented based on approximation with 3D line segments and their further transforming into a restricted body or a contact surface with the same field.

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Gravity and magnetic data inversion for 3D topography of the Moho discontinuity in the northern Red Sea area, Egypt

Cited by 38 publications

References 20 publications

Density structure and isostasy of the lithosphere in Egypt and their relation to seismicity

Density structure and isostasy of the lithosphere in Egypt and their relation to seismicity

Joint interpretation of gravity and magnetic data in the Kolárovo anomaly region by separation of sources and the inversion method of local corrections

Separation of sources and 3D inversion of gravity and magnetic data for the Thuringian Basin, Germany

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