Determination of Depth to Magnetic Source from Aeromagnetic Data of Idah, Kogi State Using Euler Deconvolution Technique

Year 2025, Volume: 7 Issue: 2, 223 - 231, 31.08.2025

Adams A. Ayomide Olufemi F. Ojo Adeboye M. Blessing

Abstract

This study focuses on the application of Euler deconvolution to Aeromagnetic Data collected in the Idah area of Kogi State, located in the North Central region of Nigeria. The research employs Euler deconvolution, a widely recognized technique in the field of geophysics, to determine the depths to magnetic sources within Idah and its surrounding areas. The methodology encompasses a series of systematic steps. Initially, the aeromagnetic data, specifically from Idah (sheet 267) undergoes preprocessing to eliminate noise and enhance the signal. Several filtering techniques, including Regional-Residual separation, Reduction to magnetic equator, and Upward continuation, are employed for this purpose. The study uses Euler deconvolution to identify potential magnetic sources in Idah, Kogi State, and calculates their depths, considering magnetic field anomalies. The results are interpreted within the geological framework. Notably, the Euler solutions for structural indices ranging from 1.0 to 3.0 reveal varying depth ranges, spanning from depths less than 1000 meters to depths exceeding 11000 meters. These solutions are spatially distributed across the region, with distinct clusters corresponding to specific structural indices. For instance, solutions with a structural index of 1.0 are concentrated predominantly in the Northwestern, Western, and Northeastern parts of the map, with limited occurrences in the Southwestern region. The study reveals that solutions with a 2.0 structural index are more concentrated in the Northwestern and central areas of the map, while those with a 3.0 index are primarily clustered in these areas. A quick and precise identification of the positions and depths of magnetic sources within the study area is made possible by the interpretation of the data from the various structural indices, which greatly advances our knowledge of the geological characteristics and possible subsurface resources of the area.

Keywords

Aeromagnetic map , euler deconvolution , magnetic sources , structural indicators , magnetic source depth magnetic sources

References

• Abbass, A.A., Mallam, A., 2013. Estimating the thickness of Sedimentation within Lower Benue Basin and Upper Anambra Basin, Nigeria, using both Spectral Depth Determination and Source Parameter Imaging. Geophysics 52, 74-78.
• Aboud, E., Salem, A., Ushijima, K., 2003. Interpretation of Aeromagnetic Data of Gebel El-Zeit, Gulf of Suez, Egypt Using Magnetic Gradient Techniques. Memoirs of the Faculty of Engineering, Kyushu University 3, 63-70.
• Allis, R.G., 1990. Geophysical anomalies over epithermal systems, Journal of Geochemical Exploration 36, 339-374.
• Amigun, J.O., Afolabi, O., Ako, B.D., 2012. Euler 3-D Deconvolution of Analytical Signal of Magnetic Anomalies over Iron Ore deposit in Okene, Nigeria. Journal of Emerging Trends in Engineering and Applied Sciences 3 (4), 711-717.
• Dalan, R.A., 2006. A geophysical approach to buried site detection using down-hole susceptibility and soil magnetic techniques. Archaeological Prospection.
• Kearey, P., Brooks, M., Hill, I., 1991. An Introduction to Geophysical Exploration Second Edition. TJ International pp. 2-160.
• Nabighian, M.N., Grauch, V.J.S., Hansen, R.O., Lafehr, T.R., Peirce, J.W., Phyllips, J.D., Ruder, M.E., 2005. The historical development of the magnetic method in 18 exploration, Geophysics 70, 33-61.
• Nwankwo, L.I., Abayomi J.S., 2017. Regional estimation of Curie-point depths and succeeding geothermal parameters from recently acquired high-resolution aeromagnetic data of the entire Bida Basin, north-central Nigeria. Geothermal Energy Science 5, 1-9.
• Philip, K.P., Michael, B., Hill, I., 2002. An Introduction to Geophysical Exploration.
• Reid, A.B., 1997. Prospect Scale Interpretation of HRAM Data: Euler Depth Estimates. Canadian Journal of Geosciences 34, 1.
• Reid, A.B., Allsop, I.M., Grasner, H, Millet, A.J., Somerton, I.W., 1990. Magnetic interpretation in three dimensions using Euler deconvolution. Geophysics 55, 80-91.
• Salako, K.A., 2014. Depth to basement determination using source parameter imaging (spi) of aeromagnetic data: An application to upper benue trough and Borno basin, Northeast, Nigeria. Academic Research International 5 (3), 17-27.
• Spector, A., Grant, F.S., 1970. Statistical models for interpreting aeromagnetic data. Geophysics 35, 293-302.
• Thompson, D.T., 1982. EULDPH – A new technique for making computer – assisted depth estimates from magnetic data. Geophysics 47, 31-37.