Determination of structural lineaments of Northeastern Laos using the LTHG and EHGA methods

Pham, Luan Thanh; Oliveira, Saulo P.; Eldosouky, Ahmed M.; Abdelrahman, Kamal; Fnais, Mohammed S.; Xayavong, Viengthong; Andráš, Peter; Le, Dung Van

doi:10.1016/j.jksus.2022.101825

Cited by 10 publications

(6 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(3) Pham et al (2019Pham et al ( , 2022b proved that 2 ≤ α ≤ 10 will produce the best solutions. As shown in Figure 4d, the LTHG can equalize different amplitudes, and provides sharper edges than the TAHG.…”

Section: Edge Detection Methodsmentioning

confidence: 99%

“…As shown in Figures 4c and 4d, the depth of the source bodies has no effect on the TAHG and LTHG, and their peak values are near the true boundaries even for deep bodies. This is one of the benefits of the TAHG and LTHG over the horizontal gradient, which cannot delineate boundaries originating from deep magnetic bodies (Pham et al, 2022b;Eldosouky et al, 2020). The FSED also enhances the boundaries of both deep and shallow bodies and its peak values are near the real boundaries (Fig.…”

Section: Edge Detection Methodsmentioning

confidence: 99%

“…has made it easier to determine subtler anomalies and generate more detailed geologic structural information. These filters generate peak responses directly over source borders, and produce better resolution and distinctive lineament maps (Eldosouky et al, 2020;Pham et al, 2022b;Oksum et al, 2021;Kamto et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An integrated approach of advanced methods for mapping geologic structures and sedimentary thickness in Ukelle and adjoining region (Southeast Nigeria)

Ekwok,

Eldosouky,

Ben

et al. 2023

Earth sci. res. j.

Self Cite

View full text Add to dashboard Cite

High-resolution aeromagnetic data were enhanced using recent and advanced filters to map the geologic structures of the Ukelle and adjoin region (Southeast Nigeria). Aeromagnetic data were reduced to the equator (RTE) and upward continued to 100 m. Subsequently, enhancement operations like the tilt angle of the horizontal gradient (TAHG), logistic function of the horizontal gradient (LTHG), and fast sigmoid function (FSED) operations were carried out. The results from these filters indicated that the ENE-WSW, NE-SW, NNE-SSW, and NNW-SSE orientations dominate the structural pattern of the Ukelle region. In addition, the edge filters delineated NE-SW trending synclinal structures that match the location of thick (500-1400 m) sedimentation obtained by the tilt-depth (TD) method. Furthermore, the structural map obtained from remote sensing data validated the lineament orientations and position of the NE-SW trending synclinal structure. The results also showed that the study location’s southeastern and northwestern flanking portions, controlled by extensive Santonian igneous intrusions and metamorphisms, are characterized by high lineaments and thin (0-500 m) sedimentation. The observed thin sedimentation is believed to be caused by widespread Santonian tectonic events in the area. At the same time, related geologic structures served as migration pathways and accumulation zones for rift mineralization.

show abstract

Section: Edge Detection Methodsmentioning

confidence: 99%

Section: Edge Detection Methodsmentioning

confidence: 99%

See 1 more Smart Citation

An integrated approach of advanced methods for mapping geologic structures and sedimentary thickness in Ukelle and adjoining region (Southeast Nigeria)

Ekwok,

Eldosouky,

Ben

et al. 2023

Earth sci. res. j.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Even though these traditional procedures are frequently employed to qualitatively interpret magnetic and gravity data [13,14], they often generate diffuse lineament maps [15][16][17][18]. However, researchers have proposed several other enhancement operations centered on potential field gradients to reduce the difficulties of the traditional edge-detection procedures [18,19]. The tilt derivative method centered on the arctan function of the vertical gradient-to-THG ratio [20], the tilt derivative of gradient amplitude [21], and the THG computed by averaging the vertical gradients [22].…”

Section: Introductionmentioning

confidence: 99%

Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria

et al. 2022

Self Cite

View full text Add to dashboard Cite

Aeromagnetic data from the Ogoja region, Southeast Nigeria, were enhanced using high-precision methods including the tilt angle of total horizontal gradient (TAHG), the softsign function (SF), and the improved logistic function (IL) with the aim of creating a new structural map. This new map can help improve the understanding of the trend, spatial distribution, and pattern of the lineaments. The TAHG, SF, and IL methods generated geologic structures with correlating trends, distributions, and patterns. However, the SF and IL techniques mapped the borders of geologic structures more precisely. The lineaments extracted from the SF and IL maps were reduced to equator (RTE) magnetic data, and a GIS was used to create structural maps with NE–SW, NW–SE, NNE–SSW, and NNW–SSE orientations. Furthermore, the depths (0–2100 m) of these geologic structures were estimated using the tilt depth technique (TDT). The high lineament density and thin sedimentation observed in the study area were triggered by the widespread Santonian igneous intrusions associated with the Abakaliki Anticlinorium. The techniques applied in our study can be employed in areas with the same conditions around the world for the precise delineation of geologic structures from magnetic and gravity data.

show abstract

“…Gravity and magnetic data can provide vital information on the subsurface structures (Dung and Minh, 2017;Hang et al, 2019;Eldosouky et al, 2021a;Eldosouky et al, 2021b;Oksum 2021). The determination of geological boundaries from the interpretation of gravity data has been the subject of several studies, and many different techniques have been introduced (Melouah et al, 2021;Eldosouky et al, 2022a;Pham et al, 2022a;Eldosouky et al, 2022b;Pham et al, 2022b;Eldosouky et al, 2022c;Ghomsi et al, 2022c;Eldosouky et al, 2022d;Ghomsi et al, 2022d), such as, for example, the peak detection methods (Blakely and Simpson, 1986;Hang et al, 2017;Pham et al, 2018;Pham et al, 2021), vertical derivatives, the filters of horizontal gradient (Cordell, 1979;Cordell and Grauch, 1985), the analytical signal (Nabighian, 1972;Nabighian, 1984;Roest et al, 1992), tilt angle (Miller and Singh, 1994), the horizontal gradient amplitude of tilt angle (Verduzco et al, 2004), enhanced horizontal gradient amplitude (Pham et al, 2020a), improved logistic function (Pham et al, 2020b), and balanced horizontal gradient amplitude filters (Prasad et al, 2022a;Prasad et al, 2022b).…”

mentioning

confidence: 99%

Contribution of advanced edge-detection methods of potential field data in the tectono-structural study of the southwestern part of Cameroon

et al. 2022

Self Cite

View full text Add to dashboard Cite

The southwest part of Cameroon is composed of a range of geological structures and sedimentary basins, whose geological history dates from the Cretaceous, and their establishment would have originated from the opening of the South Atlantic. Among these structures, the most important is the Cameroon Volcanic Line, generally denoted CVL, followed by the southern part of the Central African Shear Zone (CASZ) called the Foumban Shear Zone (FSZ), the Ntem Complex, the Benue Trough, the northern margin of the Congo Craton, and many others. The major structures identified in this part are formed as a result of geodynamic activity between the Oligocene and the recent period, to which we can add the volcanism that exists along with the continental limit. The XGM201e_2159 model is used to highlight the geological structures of Southwestern Cameroon. First, we separated the regional and residual anomalies from Bouguer gravity data. Then, we used a combination of filters to enhance the signature of the residual anomalies in Southwest Cameroon. These filters identified various geological structures in the area. Finally, we applied the enhanced horizontal gradient amplitude (EHGA) and multi-scale horizontal derivative of the vertical derivative (MSHDVD) methods to reveal the geological contacts, allowing us to establish the corresponding structural map of the region. In addition, the results obtained in this study are the first to precisely define the circumferential demarcation of the continental and oceanic expansions of Mount Cameroon, while clearly illustrating the Bao, Bomana, Tiko, and Ekona faults that extend to the Bakassi Peninsula and the Douala outlet. Furthermore, they highlight the strike–slip faults in the summit vicinity. The structural map shows that most of the geological boundaries identified in the area are trending in the NE–SW, NNE–SSW, ENE–WSW, N–S, and NW–SE directions.

show abstract

Determination of structural lineaments of Northeastern Laos using the LTHG and EHGA methods

Cited by 10 publications

References 43 publications

An integrated approach of advanced methods for mapping geologic structures and sedimentary thickness in Ukelle and adjoining region (Southeast Nigeria)

An integrated approach of advanced methods for mapping geologic structures and sedimentary thickness in Ukelle and adjoining region (Southeast Nigeria)

Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria

Contribution of advanced edge-detection methods of potential field data in the tectono-structural study of the southwestern part of Cameroon

Contact Info

Product

Resources

About