On the performance of phase-based filters for enhancing lateral boundaries of magnetic and gravity sources: a case study of the Seattle uplift

Pham, Luan Thanh; Öksüm, Erdinç; Duc, Thanh; Nguyen, Dat Viet; Eldosouky, Ahmed M.

doi:10.1007/s12517-021-06511-x

Cited by 32 publications

(9 citation statements)

References 47 publications

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“…In presence of more than one magnetic anomaly source, AS results are dominated by shallow sources. AS maxima of the magnetic data can delineate clearly the edges of the shallower anomaly sources, but are inefficient in delineating the deeper anomaly sources (Arisoy & Dikmen, 2013) because this method use the amplitudes of the derivatives of potential field data (Pham et al, 2021a).…”

Section: The Analytic Signal (As) Methodsmentioning

confidence: 99%

“…As the first phase-based filter and developed by Miller and Singh (1994), the tilt derivative (TDR), also called tilt angle (TA), is the vertical gradient normalized by the horizontal derivative magnitude (Pham et al, 2021a). It is defined by the equation:…”

Section: The Tilt Angle (Ta) Methodsmentioning

confidence: 99%

“…In particular, when shallow and deep magnetic or gravity anomaly sources overlap, delineating the edges of these strong and weak amplitude anomaly sources is a difficult task . In order to identify the horizontal extents of subsurface structures and distinctly display the edges of anomaly sources of different depths, various edge detection methods have been proposed (Prasad et al, 2022;Pham et al, 2021a). Most of the edge enhancement techniques depend either on the horizontal gradient or on the total gradient of the potential fields.…”

Section: Introductionmentioning

confidence: 99%

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Structural Mapping of Kakobola and Its Surroundings by Analyzing Geomagnetic Data

Muliwavyo,

Musitu

et al. 2023

GEP

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This study focuses on the Kakobola region and its surroundings where cavities discovered in its basement may represent a major risk for the hydroelectric dam erected on the Lufuku River near the Kakobola city and the civil engineering works in the study area. In order to deepen the studies related to this understudied region and provide decision-makers with information that will enable them to make the necessary and appropriate decisions regarding the development of this area, a study based on the analysis of geomagnetic data was carried out using certain methods revealing more shallow than deep structures, and others highlighting the limits of both shallower and deeper structures. Total magnetic anomalies and reduced to equator (RTE) magnetic anomalies were used to map the subsurface of the Kakobola region and its surroundings. In order to detect the edges of magnetized structures, the horizontal gradient magnitude (HGM), the analytic signal (AS), the horizontal gradient of tilt angle (HGTA), the tilt angle (TA), the theta map (TM), the enhanced total horizontal derivative of the tilt angle (ETHDR), the tilt angle of the horizontal gradient (TAHG), and the tilt angle of analytic signal (TAAS) were used. The study area is characterized by two areas of low values of magnetic anomalies and two other sources of high magnetic anomalies located in the bed and the neighborhood of the two major rivers in the region. The shallow sources of magnetic anomalies are lying in the bed and the vicinity of the same rivers in the study area. The magnetic sources in the study area are connected and almost linear. Several magnetic lineaments identified in this region by different methods present several preferential directions, but the most predominant directions are NE-SW, NW-SE, W-E and NE-SW.

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Section: The Analytic Signal (As) Methodsmentioning

confidence: 99%

Section: The Tilt Angle (Ta) Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Mapping of Kakobola and Its Surroundings by Analyzing Geomagnetic Data

Muliwavyo,

Musitu

et al. 2023

GEP

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“…Separating the deep from the shallow sources of potential field anomalies and recognizing their edges are crucial in geophysics (Eldosouky, 2019;Pham et al, 2021a;Eldosouky and Mohamed, 2021;Eldosouky et al, 2022d). As a result, edge detection is an important analysis direction in pattern recognition for mapping structures, geologic contacts, and ore deposits (Oruç, 2011;Arisoy and Dikmen, 2013;Ibraheem et al, 2018;Eldosouky and Saada, 2020;Pham et al, 2020;Pham et al, 2021a;Saada et al, 2021a;Pham et al, 2021b;Saada et al, 2021b;Pham et al, 2021c;Pham et al, 2021d;Melouah et al, 2021;Eldosouky et al, 2022a;Eldosouky et al, 2022b;Eldosouky et al, 2022c;Sehsah and Eldosouky, 2022).…”

Section: Introductionmentioning

confidence: 99%

Integrated Geophysical Assessment of Groundwater Potential in Southwestern Saudi Arabia

et al. 2022

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Saudi Arabia is seeking fresh groundwater resources to face the increase in anthropogenic activities. The groundwater storage variations and occurrence were investigated and the surface and subsurface structures influencing the groundwater resources in the research area were defined using a combined study of Gravity Recovery and Climate Experiment, aeromagnetic data, and electrical resistivity data with other relevant datasets. Results are: The groundwater storage fluctuation is calculated at −0.34 ± 0.01 mm/yr during the period 04/2002-12/2021. The area is receiving an average annual rainfall rate of 117.6 mm during the period 2002 to 2019. Three structural trends, defined in the directions of NS, NNW, and NNE are cutting the sedimentary cover and the basement rocks. The sedimentary cover ranges from 0 to 1.2 km thick. Vertical electrical sounding results indicate three main geoelectric layers: the surface geoelectrical layer of higher resistivity values (428-9626 Ω. m) is made up of unconsolidated Quaternary sediments; the water-bearing layer of saturated sands with a resistivity range between 5.1 and 153 Ω. m and with depths vary from 1 to 94 m, and highly fractured basement rocks with resistivity values ranging from 813 to 6030 Ω. m. The integrated results are useful in providing a comprehensive image of the study area’s surface and subsurface structures, as well as groundwater potential in the southwestern part of Saudi Arabia. Our integrated approach provides a reproducible model for assessing groundwater potential in arid and semiarid areas.

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“…The gravity method can help estimate the depth and horizontal location of the geological structures [11][12][13][14][15][16][17][18]. The horizontal locations of density structures have a great effect on the understanding of mineral deposits, also the optimization of exploratory drilling operations [19][20][21]. These locations also play an important role in basin characterization for exploring oil and gas [22].…”

Section: Introductionmentioning

confidence: 99%

The utility of the enhancement techniques for mapping subsurface structures from gravity data

Pham¹,

Xuan²,

Eldosouky³

et al. 2021

Frontiers in Scientific Research and Technology

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An important feature in the interpretation of gravity data is the determination of the edges of the density structures. There are several different enhancement techniques used to achieve the edge locations. In this study, we aim to estimate the effectiveness of some edge enhancement techniques such as the total horizontal gradient, analytic signal, theta map, and logistic function of the total horizontal gradient in terms of their accuracy on detection of subsurface structures from gravity data. These methods were tested on synthetic gravity data with and without noise. Findings show that the logistic function of the total horizontal gradient performs better than other methods under almost all cases. Additionally, the methods are also applied to real gravity data from the Phu Khanh basin as a practical example. The results determined by the LTHG technique reveals the presence of many structures with E-W, NE-SW, NNW-SSE, ENE-WSW, and NNE-SSW trends in the basin.

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On the performance of phase-based filters for enhancing lateral boundaries of magnetic and gravity sources: a case study of the Seattle uplift

Cited by 32 publications

References 47 publications

Structural Mapping of Kakobola and Its Surroundings by Analyzing Geomagnetic Data

Structural Mapping of Kakobola and Its Surroundings by Analyzing Geomagnetic Data

Integrated Geophysical Assessment of Groundwater Potential in Southwestern Saudi Arabia

The utility of the enhancement techniques for mapping subsurface structures from gravity data

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