High Resolution Magnetic Field Signatures Over Akure and Its Environs, Southwestern Nigeria

Ikeoha, Cyril Chijioke

doi:10.26480/esmy.01.2019.09.17

Cited by 6 publications

(6 citation statements)

References 28 publications

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“…In this study, the reduction-to-equator (RTE) filter (on Geosoft Oasis Montaj) was used to enhance the features on RMI data, because the study area falls within the low magnetic latitude zone. RTE makes Earth's magnetic field and magnetization of the magnetic sources to appear horizontal, centers the peaks of magnetic anomalies over their sources, and removes the magnetic latitudinal influences on RMI [69]. The RTE was performed using two-dimensional fast Fourier transform (2D-FFT) method, with the mean inclination and declination values of −11.10 and −4.90, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The advantages of continuation technique over low pass and high pass include the following: prominent reduction and separation of near surface (shallow) effects over the deeper ones [68]; its use in the estimation of depth to magnetic sources; and it retains the signatures of the geopotential field anomaly, provided that the continuation does not intrude into the top of the magnetic body [79]. The amplitude of potential over a magnetic body changes with elevation as an exponential function of wavelength [69]. In downward continuation, the magnetic sources are enhanced at certain depth, such that the measurement's plane is brought near the source.…”

Section: Methodsmentioning

confidence: 99%

“…These intrusions are also noticed around the southern and northwestern zones of the study area. This could be associated with the depletion of magnetites or network of lineaments, which could be fractured/weak zones or regions with thick overburden [69,[85][86][87]. Figure 7 displays slight shift in the positions of magnetic anomalies to the NW of the initial positions on the total magnetic anomaly.…”

Section: Aeromagnetic Mapsmentioning

confidence: 99%

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Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Oladejo¹,

Adagunodo

Sunmonu

et al. 2020

Open Geosciences

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A seismic wave is released when there is sudden displacement on a fault plane. The passage of this wave along the fault plane or within the lithosphere could result in ground shaking or vibration at the surface of the Earth. To provide a geophysical explanation to this phenomenon, the high-resolution aeromagnetic data of the sedimentary terrain and part of the Basement Complex of Southwestern Nigeria were processed and interpreted to provide fault architecture of the area, which could serve as conduit for the passage of seismic energy in the study area. High-resolution aeromagnetic data along the Lagos–Ore axis are processed for fault mapping in the study area. The reduced-to-equator (RTE) residual aeromagnetic data used were enhanced using the total horizontal derivative (THD) and upward continuation (UC) filtering techniques on Oasis Montaj 6.4.2 (HJ) software. The resultant maps were overlaid and compared with the plotted RTE residual maps for relevant interpretations. Varying signatures of magnetic anomalies are grouped into high (57.9–89.1 nT), intermediate (38.2–57.9 nT), and low (4.0–38.2 nT) magnetic intensities, which are associated with contracting basement rocks features. The obtained lineaments from the THD reveal areas of various deformations such as brittle, which is associated with faults/fractures, and ductile deformation, which is associated with folds of geological features. The faults, as depict by the UC map, reveal different depth ranges of 500–2250 m at the western side and 1,500–1,250 m at the northwestern area of the study. Since it has been on record that September 11, 2009, earth tremor of magnitude 4.4, with the epicenter at Allada, Bennin Republic, 128 km west of Lagos, Nigeria occurred within the study area, it can be inferred that the established geologic fault architecture could be responsible for the hazard and be part or synthetic to the Ifewara-Zungeru fault in Nigeria.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Aeromagnetic Mapsmentioning

confidence: 99%

See 1 more Smart Citation

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Oladejo¹,

Adagunodo

Sunmonu

et al. 2020

Open Geosciences

View full text Add to dashboard Cite

show abstract

“…Because the research location is in the low magnetic latitude zone, the reduction-to-equator (RTE) filter on Geosoft Oasis Montaj was employed to improve the features on TMI data. According to Okpoli (2019), RTE removes the magnetic latitudinal influences, centers the peaks of magnetic anomalies on their sources, and makes the Earth's magnetic field and magnetization of the magnetic sources look horizontal. Using the two-dimensional fast Fourier transform (2D-FFT) method, the RTE was carried out.…”

Section: Volcanic and Geothermal Surface Manifestations In Some Afric...mentioning

confidence: 99%

Depth estimation for geothermal reconnaissance deduced from aeromagnetic data over the Mambilla plateau and environs, Taraba State, Northeastern Nigeria

Yohanna,

Likkason,

Maigari

et al. 2024

SWJ

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The geothermal gradient, heat flow and Curie point depth (CPD) were calculated using aeromagnetic data to assess their viability in terms of energy generation around Mambilla plateau and environ, Northeast, Nigeria. Each block of spectral plot was used to determine the depths to the top boundary (Zt), to bottom (Zb) and centroid (Zo). Empirical formula was used to calculate the geothermal gradient, Curie Point Depth (CPD) and heat flow in the area. The resulting depth measurements were then consider as the area's geothermal gradient, heat flow, and curie point depths (CPD). Two CPD locations with geothermal potential are described in the results: areas with shallow curie point depths (0.11-1.72 km) and areas with deeper curie point depths (0.34-4.46 km). The geothermal gradients measured range from 46.22 to 121.620oCkm-1, while the measured heat-flow values range from 139.16 to 304.05 mWm-2 . This study also reveals how complex magmatic and tectonic linkages of large intrusions and fault systems, particularly the Chain faults that may have extended into the study area, are related to geothermal systems. A common CPD of 3oC100m-1 or 30oCKm-1 and average thermal conductivity values ranging from 105.68 to 227.63mWm-2 are considered to have a good potential for geothermal energy. This result have strong and positive correlation with what is obtained in some countries were geothermal energy is been utilized for power generation. The potential for geothermal energy resources in the area is therefore very high. The study's most important and practical finding is that the area has good potentials for geothermal energy resources, which could be used to compliment the Government-owned Mambilla Hydro-Electric Power Plant, as a reliable renewable energy source.

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“…Based on the IoT architecture and Zig Bee wireless sensor network technology (Zhang et al, 2018a;Okpoli, 2019) and fuzzy adaptive PID control algorithm combined with greenhouses to analyze the characteristics of greenhouse environmental factors. Just as the above mentioned temperature, moisture, illumination, etc.…”

Section: Introductionmentioning

confidence: 99%

Designing an Intelligent Greenhouse Monitoring System Based on the Internet of Things

Cai¹

2019

Appl. Ecol. Env. Res.

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With the development of the Internet, the development of the Internet of Things (IoT) has also been promoted. The IoT is a network of "objects and objects connected." The IoT is based on cloud computing platforms and wireless networks. It acquires data based on sensor groups and conducts decision analysis to change the behavior control and feedback of objects, such as the greenhouse monitoring system studied in this paper. The IoT has subverted the traditional agricultural production model, from the agricultural farming model to the "smart agriculture" production-operation-sales model, which provides a direction for the sustainable development of agriculture in China at this stage. Based on the IoT and Zig Bee wireless sensor network technology, this paper designs a general scheme of an intelligent greenhouse control system based on IoT technology. The greenhouse control strategy was studied using IoT technology and fuzzy adaptive PID control algorithm. The experimental simulation was carried out with MATLAB software. The simulation results show that the optimal control of greenhouse temperature is achieved. The temperature in the greenhouse is always maintained at 16.5 °C -23.0 °C, and the humidity value is always maintained at 68.2% RH-89.3% RH. The test verified that the paper can achieve the expected effect for the greenhouse.

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High Resolution Magnetic Field Signatures Over Akure and Its Environs, Southwestern Nigeria

Cited by 6 publications

References 28 publications

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Depth estimation for geothermal reconnaissance deduced from aeromagnetic data over the Mambilla plateau and environs, Taraba State, Northeastern Nigeria

Designing an Intelligent Greenhouse Monitoring System Based on the Internet of Things

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