Edge detection of potential field sources using the softsign function

Pham, Luan Thanh; Öksüm, Erdinç; Le, Dung Van; Ferreira, Francisco José Fonseca; Le, Sang Thi

doi:10.1080/10106049.2021.1882007

Cited by 45 publications

(19 citation statements)

References 40 publications

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“…Another filter for enhancement of the edges is introduced by Pham et al (2021c) which is based on the softsign function and the derivatives of the THG. The filter is given by:…”

Section: Methodsmentioning

confidence: 99%

“…where k is decided by the researcher. Pham et al (2021c) showed that the best results can be obtained with the use of values between 1 and 10 of the parameter k.…”

Section: Methodsmentioning

confidence: 99%

“…Ferreira et al (2013) presented the BTHG method known as the tilt angle of the THG. Pham et al (2020aPham et al ( , 2021c presented an enhanced version of the horizontal gradient amplitude (EHGA), and softsign function (SF) filters that are based on the derivatives of the THG. Apart from the techniques mentioned above, many other methods in the literature also rely on potential field data gradients.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from the techniques mentioned above, many other methods in the literature also rely on potential field data gradients. (Hsu et al, 1996;Cooper and Cowan, 2008;Beiki, 2010;Kha et al, 2018;Pham et al, 2018bPham et al, , 2020a2021c;Nasuti et al, 2019;Oksum et al, 2021b;Melouah and Pham, 2021;Pham 2021;Kafadar, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Determination of subsurface lineaments in the Hoang Sa islands using enhanced methods of gravity total horizontal gradient

Thanh

Öksüm

Kafadar

et al. 2022

Vietnam J. Earth Sci.

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The Hoang Sa islands, located in the northern part of the East Vietnam Sea, lack information on geological structural boundaries. The gravity data from the global marine gravity model were analyzed using the enhanced total horizontal gradient methods to delineate geological structures that appear as lineaments on the transformed gravity anomaly maps of the area. Before applying the techniques to gravity data of the Hoang Sa islands, their effectiveness was demonstrated by comparing them with the results from the total horizontal gradient method for a synthetic model. Applying the enhanced horizontal gradient methods shows that most of the lineaments identified in the Hoang Sa islands are trending in the WSW-ENE, NE-SW, E-W, WNW-ESE and NNW-SSE directions. These results provide a better understanding of the subsurface structural features of the islands.

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“…Another filter for enhancement of the edges is introduced by Pham et al (2021c) which is based on the softsign function and the derivatives of the THG. The filter is given by:…”

Section: Methodsmentioning

confidence: 99%

“…where k is decided by the researcher. Pham et al (2021c) showed that the best results can be obtained with the use of values between 1 and 10 of the parameter k.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of subsurface lineaments in the Hoang Sa islands using enhanced methods of gravity total horizontal gradient

Thanh

Öksüm

Kafadar

et al. 2022

Vietnam J. Earth Sci.

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show abstract

“…Some authors have developed the different techniques based on the amplitudes of the gradients of the field to detect the edges related to a known gravity anomaly [46][47][48][49]. Several other authors have introduced the techniques based on the ratios of gradients of the gravity data to extract the edges of the sources [50][51][52][53][54][55][56][57]. One of the most important advantages of these techniques is that they do not need an assumption about the nature and type of the causative bodies [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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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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Edge detection of potential field sources using the softsign function

Cited by 45 publications

References 40 publications

Determination of subsurface lineaments in the Hoang Sa islands using enhanced methods of gravity total horizontal gradient

Determination of subsurface lineaments in the Hoang Sa islands using enhanced methods of gravity total horizontal gradient

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

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

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