Edge Detectors as Structural Imaging Tools Using Aeromagnetic Data: A Case Study of Sohag Area, Egypt

Ibraheem, Ismael M.; Haggag, Menna; Tezkan, B.

doi:10.3390/geosciences9050211

Cited by 31 publications

(9 citation statements)

References 25 publications

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“…The amplitude of the analytical signal (also called the total gradient) for three‐dimensional (3D) structures is given by the following expression (Roest et al ., 1992; Ibraheem et al ., 2019a):

A S false(x, y false) = \sqrt{{((), \frac{\partial M}{\partial x})}^{2} + {((), \frac{\partial M}{\partial y})}^{2} + {((), \frac{\partial M}{\partial z})}^{2}},

where AS(x,y) is the amplitude of the analytic signal,

M

is the measured magnetic field at ( x , y ), and

\partial M / \partial x, \partial M / \partial y a n d \partial M / \partial z

are the two horizontal and vertical derivatives of the measured field, respectively.…”

Section: Geophysical Methodsmentioning

confidence: 99%

“…Several dipolar and isolated highly positive magnetic anomalies, presumably associated with buried metallic bodies, and other magnetic features can be recognized on the magnetic map. To overcome the distortion caused by the inclination of the earth's magnetic field and to re-position magnetic anomalies directly over their sources, the magnetic data were transferred to the frequency domain using fast Fourier transform (FFT), then a reduction to the north magnetic pole (RTP) filter was applied assuming that the sources have no remanent magnetization (Baranov and Naudy, 1964;Rajagopalan, 2003;Ibraheem et al, 2018a;Ibraheem et al, 2019aIbraheem et al, , 2019b. RTP filtering is a fundamental process, which allows a more precise estimate of the location of magnetic sources than the total magnetic intensity data.…”

Section: Magnetometry In Archaeological Prospectingmentioning

confidence: 99%

“…The amplitude of the analytical signal (also called the total gradient) for three-dimensional (3D) structures is given by (Roest et al, 1992;Ibraheem et al, 2019a):…”

Section: Analytical Signalmentioning

confidence: 99%

See 2 more Smart Citations

Archaeogeophysical exploration in Neuss‐Norf, Germany using electrical resistivity tomography and magnetic data

Ibraheem

Bergers

Tezkan

2021

Near Surface Geophysics

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A combination of electrical resistivity tomography (ERT) and magnetic gradiometry was selected to examine a hypothesis concerning the presence of remains of one of the oldest archaeological churches in the Rhineland, located in Neuss‐Norf, Germany. The gradiometer survey was carried out to measure the vertical gradient of the magnetic field using a proton precession magnetometer along several profiles. The magnetic data were reduced to the magnetic pole; then analytic signal and power spectrum techniques were applied. The ERT survey was based on the magnetic results, and both Wenner and dipole–dipole configurations were employed to collect the apparent resistivity data along 12 ERT profiles. The field ERT data from these two arrays were merged into one dataset to form a non‐conventional mixed array. The robust (blocky) inversion technique was applied to the resistivity data in order to derive the two‐dimensional resistivity distribution of the subsurface. Despite the noisy surroundings, the magnetic survey was able to give an indication of potential walls of the ancient church in addition to several subsurface magnetic sources. Moreover, highly resistivity anomalies were observed within the first 1–2 m of the subsurface soil and were interpreted as possible remains of man‐made structures. This depth range was also confirmed by the spectral analysis of the magnetic data. A strong consistency between the two methods was observed in some locations of the site. In addition, the ERT measurements confirm and complement most of the magnetic results. We successfully detected anomalous zones that could be associated with the walls of at least one ancient church building in addition to several possible archaeological structures in the survey area.

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A S false(x, y false) = \sqrt{{((), \frac{\partial M}{\partial x})}^{2} + {((), \frac{\partial M}{\partial y})}^{2} + {((), \frac{\partial M}{\partial z})}^{2}},

where AS(x,y) is the amplitude of the analytic signal,

M

is the measured magnetic field at ( x , y ), and

\partial M / \partial x, \partial M / \partial y a n d \partial M / \partial z

are the two horizontal and vertical derivatives of the measured field, respectively.…”

Section: Geophysical Methodsmentioning

confidence: 99%

Section: Magnetometry In Archaeological Prospectingmentioning

confidence: 99%

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Archaeogeophysical exploration in Neuss‐Norf, Germany using electrical resistivity tomography and magnetic data

Ibraheem

Bergers

Tezkan

2021

Near Surface Geophysics

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“…It is typically applied to gravity data to delineate near-surface geological features and to enhance high-wavenumber components of a spectrum. The zero values of the vertical derivative of gravity data usually correspond to geological boundaries [35]. The mathematically vertical derivative is given below:…”

Section: Methodsmentioning

confidence: 99%

Continuity of Great Sumatran Fault in the Marine Area Revealed by 3d Inversion of Gravity Data

et al. 2020

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The Great Sumatran Fault (GSF) is a 1900-km-long fault extending from Lampung, Indonesia, to India's Andaman Islands. The fault location is not only on the land but also in the marine area. Previous studies were only focused on the land area of Sumatra and Andaman Islands even though the marine fault has also impacted earthquakes and tsunamis such as in 2004. As an effort to disaster risk mitigation, this study used the gravity method to map and study the continuity of the GSF in the marine area from the Aceh Province, Indonesia, to the Andaman Islands, India. The gravity data were obtained from Topex with a resolution of 1.85 km/px. Based on the Bouguer data, the subduction zone in the western part of the Indian Ocean is observed with the anomaly of 500–700 mGal, while the residual structure of GSF, relative to the subduction zone, only comes to clarity through a horizontal derivative transformation with anomaly 130-250 mGal. To delineate the fault's geometry, the data were inverted by GRABLOX 1.6 using Singular Value Decomposition and Occam methods. The 3D modeling results also clearly show the contrast density between regional faults such as subduction zones on the Westside of the West Andaman Fault (WAF). The GSF faults can also be well demonstrated at 50 km depth. Based on these results, the gravity Topex is potentially used as a preliminary study of the GSF activity in the marine area.

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“…The magnetic data were transferred to the frequency domain using Fast Fourier Transform (FFT). Subsequently, a reduction to the pole (RTP) filter was applied to the magnetic data-assuming only induced magnetization-to improve the visual interpretation of the magnetic anomalies by disposing of the distortion caused by the inclination of the earth's magnetic field and by shifting the magnetic anomalies to be over their sources (Ibraheem et al, 2018a(Ibraheem et al, , b, 2019 using values of 66.3°and 2°for inclination and declination of the survey area, respectively. Magnetic anomalies are usually generated from either an induced magnetization or a permanent magnetization.…”

Section: Magnetic Surveymentioning

confidence: 99%

Integrated Interpretation of Magnetic and ERT Data to Characterize a Landfill in the North-West of Cologne, Germany

Ibraheem

Tezkan

Bergers

2021

Pure Appl. Geophys.

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Electrical resistivity tomography (ERT) and ground magnetic surveys were applied to characterize an old uncontrolled landfill in a former exploited sand and gravel quarry in an area to the north-west of the city of Cologne, Germany. The total magnetic field and its vertical gradient were recorded using a proton precession magnetometer to cover an area of about 43,250 m2. The magnetic data were transferred to the frequency domain and then reduced to the north magnetic pole. The amplitude of the analytical signal was calculated to define the magnetic materials within and outside the landfill. Eight ERT profiles were constructed based on the results of the magnetic survey using different electrode arrays (Wenner, dipole–dipole, and Schlumberger). In order to increase both data coverage and sensitivity and to decrease uncertainty, a non-conventional mixed array was used. The subsurface resistivity distributions were imaged using the robust (L1-norm) inversion method. The resultant inverted subsurface true resistivity data were presented in the form of 2D cross sections and 3D fence diagram. These non-invasive geophysical tools helped us to portray the covering soil, the spatial limits of the landfill, and the depth of the waste body. We also successfully detected low resistivity zones at deeper depths than expected, which probably be associated with migration pathways of the leachate plumes. The findings of the present study provide valuable information for decision makers with regards to environmental monitoring and assessment.

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Edge Detectors as Structural Imaging Tools Using Aeromagnetic Data: A Case Study of Sohag Area, Egypt

Cited by 31 publications

References 25 publications

Archaeogeophysical exploration in Neuss‐Norf, Germany using electrical resistivity tomography and magnetic data

Archaeogeophysical exploration in Neuss‐Norf, Germany using electrical resistivity tomography and magnetic data

Continuity of Great Sumatran Fault in the Marine Area Revealed by 3d Inversion of Gravity Data

Integrated Interpretation of Magnetic and ERT Data to Characterize a Landfill in the North-West of Cologne, Germany

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