Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria
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 hel...
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MDPI AG
2022-09-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/10/1227 |
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| author | Stephen E. Ekwok Ahmed M. Eldosouky Ubong C. Ben Hassan Alzahrani Kamal Abdelrahman Ogiji-Idaga M. Achadu Luan Thanh Pham Anthony E. Akpan David Gómez-Ortiz |
| author_facet | Stephen E. Ekwok Ahmed M. Eldosouky Ubong C. Ben Hassan Alzahrani Kamal Abdelrahman Ogiji-Idaga M. Achadu Luan Thanh Pham Anthony E. Akpan David Gómez-Ortiz |
| author_sort | Stephen E. Ekwok |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T19:44:17Z |
| format | Article |
| id | doaj.art-48a93194cbbe4322b7097c6102f2fe40 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T19:44:17Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-48a93194cbbe4322b7097c6102f2fe402023-11-24T01:29:05ZengMDPI AGMinerals2075-163X2022-09-011210122710.3390/min12101227Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast NigeriaStephen E. Ekwok0Ahmed M. Eldosouky1Ubong C. Ben2Hassan Alzahrani3Kamal Abdelrahman4Ogiji-Idaga M. Achadu5Luan Thanh Pham6Anthony E. Akpan7David Gómez-Ortiz8Applied Geophysics Programme, Department of Physics, University of Calabar, Calabar P.M.B. 1115, Cross River State, NigeriaDepartment of Geology, Suez University, Suez 43518, EgyptApplied Geophysics Programme, Department of Physics, University of Calabar, Calabar P.M.B. 1115, Cross River State, NigeriaDepartment of Geology and Geophysics, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaDepartment of Geology and Geophysics, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaDepartment of Geology, University of Calabar, Calabar P.M.B. 1115, Cross River State, NigeriaFaculty of Physics, University of Science, Vietnam National University, Hanoi 700000, VietnamApplied Geophysics Programme, Department of Physics, University of Calabar, Calabar P.M.B. 1115, Cross River State, NigeriaDepartment of Biology and Geology, Physics and Inorganic Chemistry, ESCET, Universidad Rey Juan Carlos, Móstoles, 28032 Madrid, SpainAeromagnetic 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.https://www.mdpi.com/2075-163X/12/10/1227tilt-angle of total horizontal gradientsoftsign functionimproved logistic functionmagnetic methodSoutheast Nigeria |
| spellingShingle | Stephen E. Ekwok Ahmed M. Eldosouky Ubong C. Ben Hassan Alzahrani Kamal Abdelrahman Ogiji-Idaga M. Achadu Luan Thanh Pham Anthony E. Akpan David Gómez-Ortiz Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria Minerals tilt-angle of total horizontal gradient softsign function improved logistic function magnetic method Southeast Nigeria |
| title | Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria |
| title_full | Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria |
| title_fullStr | Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria |
| title_full_unstemmed | Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria |
| title_short | Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria |
| title_sort | application of high precision filters on airborne magnetic data a case study of the ogoja region southeast nigeria |
| topic | tilt-angle of total horizontal gradient softsign function improved logistic function magnetic method Southeast Nigeria |
| url | https://www.mdpi.com/2075-163X/12/10/1227 |
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