Analysis of Aeromagnetic Data of North-Eastern Part of Sokoto Basin for Identification of Geological Structures in Sokoto State, Nigeria
DOI:
https://doi.org/10.64348/zije.2025204Keywords:
Geological structures, Aeromagnetic data, Sokoto basin, Iullemmeden basin.Abstract
This study centers on investigating the subsurface condition of the north-eastern part of the Sokoto Basin using aeromagnetic data for geological structures. This area falls within the Sokoto Basin, the Nigerian portion of the Iullemmeden Basin, and covers four adjacent quarter-degree sheets of Gada, Sabon Birnin, Rabah, and Isa. Qualitative and quantitative interpretation techniques which include First and Second Vertical Derivatives, Upward Continuation, Analytic Signal, Source Parameter Imaging, and Euler Deconvolution were employed. The first and second vertical derivatives applied show the response of the target structures, which helps to remove noise caused by high-frequency shallow anomalies. The analytic signal map shows high analytic signal amplitude most prominently around the east-west flank, with low analytic signal value towards the centre, with amplitude ranging from 0.00 nT to 0.08 nT. The data was subjected to upward continuation at 2 km, 5 km, 10 km, and 15 km with magnetic field values ranging from 7.25 nT to 84.27 nT, 17.73 nT to 74.46 nT, 22.17 nT to 68.86 nT, and 23.83 nT to 67.12 nT, respectively. The result shows the magnetic anomaly for deep-seated features becomes more obvious by projecting from a lower elevation to a higher elevation, thereby removing noise caused by high-frequency shallow anomalies.
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