Performance Evaluation of Amplitude- and Phase-Based Methods for Estimating Edges of Potential Field Sources

Pham, Luan Thanh; Vu, Minh N.; Le, Sang Thi

doi:10.1007/s40995-021-01122-3

Cited by 24 publications

(13 citation statements)

References 45 publications

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“…The TDR, TM, and TDX methods can balance the edges of small and large amplitude anomalies at the same time, but the peaks of the TDR are located directly over the center of the sources. Therefore, this filter is not a border detection tool, as pointed out by Oksum, Le, Vu, Nguyen, and Pham (2021) and Pham, Oksum, et al (2021); Pham, Vu, and Le (2021), making delineating geological structures problematic. The TM and TDX filters yield more noticeable and interconnected linear structures, oriented ENE–WSW, NW–SE, and SW–NE in agreement with Bouyo, Zhao, Penaye, Zhang, and Njel (2015) and Essi et al (2017, 2019).…”

Section: Resultsmentioning

confidence: 99%

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Ghomsi

Pham²,

Steffen

et al. 2022

Geological Journal

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The Cretaceous basins of the West and Central African Rift System (WCARS) are characterized by sinistral strike-slip movements observed between the Benue and Arabian-Nubian microplates. These basins share a similar basin-filling structure, history, and tectonic processes. They have attracted a significant interest in the study of their geodynamics and subsurface structure through geophysical exploration methods. Nevertheless, North Cameroon located in this microplate confluence has not yet been investigated in terms of identifying geological structures, such as lineaments and faults. To contribute to a better understanding of the northern Cameroon structural framework and its tectonic context, we investigate the lineaments in northern Cameroon by using the EIGEN-6C4 gravitational model and a variety of recent processing techniques (Tilt derivative [TDR], Theta Map [TM], Horizontal tilt angle [TDX], and Edge Detector [ED]). Our results show that the lineaments are trending in ENE-WSW, NW-SE, NE-SW, and WNW-ESE directions. These directions are consistent with the Cretaceous Garoua Rift and granitoids of the Cameroon-Chad line. The presented result clearly delineates continuous architectonic features of the structural edges of the Saharan Metacraton, the Cretaceous Garoua Rift, the Bibemi-Léré granitoids, and the Adamawa faults.

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Section: Resultsmentioning

confidence: 99%

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Ghomsi

Pham²,

Steffen

et al. 2022

Geological Journal

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“…The HGM emphasizes more the edges, the fractures and/or lithologic contacts of the shallow bodies than those of deeper sources (Arisoy & Dikmen, 2013). In HGM results, high amplitude responses from the shallow sources dominate low amplitude responses from deep sources (Pham et al, 2021b). In fact, the HGM filter uses the amplitudes of the derivatives of potential field data (Pham et al, 2021b).…”

Section: The Horizontal Gradient Magnitude (Hgm)mentioning

confidence: 99%

“…In HGM results, high amplitude responses from the shallow sources dominate low amplitude responses from deep sources (Pham et al, 2021b). In fact, the HGM filter uses the amplitudes of the derivatives of potential field data (Pham et al, 2021b).…”

Section: The Horizontal Gradient Magnitude (Hgm)mentioning

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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“…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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Performance Evaluation of Amplitude- and Phase-Based Methods for Estimating Edges of Potential Field Sources

Cited by 24 publications

References 45 publications

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Delineating structural features of North Cameroon using the EIGEN6C4 high‐resolution global gravitational model

Structural Mapping of Kakobola and Its Surroundings by Analyzing Geomagnetic Data

Integrated Geophysical Assessment of Groundwater Potential in Southwestern Saudi Arabia

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