Delineation of Horizontal Locations and Estimation of Depth to Magnetic Source Geometries of Dubumbali, North-East Nigeria


  • T. O. Lawal Department of Physics, University of Ilorin
  • J. A. Sunday Department of Science Laboratory Technology, Kwara State Polytechnic, Ilorin
  • S. O. Issa Department of Geography, Kwara State Polytechnic, Ilorin
  • O. Fawale Department of Science Laboratory Technology, Federal Polytechnic, Ado-Ekiti
  • L. I. Nwankwo Department of Physics, Federal University Kashere, Gombe


Aeromagnetic Data, Wavelet Transform Technique (WTT), Euler Deconvolution Technique (EDT), Fourier Transform Technique (FTT), Magnetic Source Geometrics


Identification of magnetic source geometries of causative bodies is an important procedure when prospecting for hydrocarbon signatures from aeromagnetic data. In order to achieve this purpose, three methods namely Wavelet transform technique (WTT), Fourier transform technique (FTT) and Euler deconvolution technique (EDT) were applied to the reduced to equator (RTE) magnetic data. The WTT applied to the data is based on Morlet wavelet to determine the horizontal locations of magnetic source distribution in the potential field anomalies. These anomalies are always superimposed upon one another in frequency and space domain making it difficult to identify magnetic sources which are of adjacent sources. In view of this, each of the profile data was convoluted with the continuous wavelet transform and the square of coefficients from the convoluted profiles were plotted against the pseudo-wave number. Also, a scaled normalization factor was introduced on the coefficients so that the resolution of various adjacent magnetic sources can be revealed. Depth to magnetic sources was obtained using the FTT, while EDT is used to identify and estimate depth to various magnetic source geometrics with prescribed values of structural indices ranging from 1.0 to 3.0. From this analysis, we have been able to use both WTT and EDT to identify various magnetic source geometries which are attributed to volcanic intrusive rocks found to be predominant in the area while the results of depth estimate using both FTT and EDT ranges from 250 m to 1800 m. The study concluded that the methods are not only useful in the identification and estimation of source geometries due to magnetic anomalies alone, their combinations have served as a tool for identifying hydrocarbon signatures within the study area.


P. Keary & M. Brooks, ``An Introduction to Geophysical Exploration", Blackwell Science Limited, {2} (2002) 155.

J. Rivas, ``Gravity and Magnetic Methods. A short course on Surface Exploration for Geothermal Recourses organized by UNU-GTP and LaGeo", In Ahuachapan and Santa Tecla (2009).

Y. S. Yang, Y. Y. Li & T. Y. Liu, ``Continuous Wavelet Transforms, Theoretical Aspects and Application to Aeromagnetic Data at the Huanghua Depression, Dagang Oilfield, China", Geophysical Prospecting {58} (2010) 669.

B. Oruc, ``Determination of Horizontal Locations and Depths of Magnetic Sources Using Continuous Wavelet Transform", Yerbilimleri {34} (2013) 177.

M. Abdullahi, R. Kumar & K. U. Singh, ``Magnetic Basement Depth from High Resolution Aeromagnetic Data of Parts of Lower and Middle Benue Trough (Nigeria) using Scaling Spectral Method", J. African Earth Sci. {150} (2019) 387.

J. Kumar & G. Foufoula, ``Wavelet Analysis for Geophysical Applications", The American Geophysical Union. Reviews of Geophysics {735} (1997) 385.

C. Torrence & G. P. Compo, ``A Practical Guide to Wavelet Analysis", Bulletin of the American Meteorological Society {79} (1998) 61.

R. A. T. Ridsdill-Smith, ``The Application of the Wavelet Transform to the Processing of Aeromagnetic Data. Ph.D. Thesis Submitted to the Department of Geology and Geophysics and Department of Mathematics and Statistics, University of Western Australia", (2000).

P. Sailhac, A. Galdeano, D. Gibert, F. Moreau & C. Delor, ``Identification of Sources of Potential Fields with the Continuous Wavelet Transform: Complex Wavelets and Application to Aeromagnetic Profiles in French Guiana", Journal of Geophysical Research {105} (2000) 19455.

P. Sailhac & D. Gibert, ``Identification of Sources of Potential Fields with the Continuous Wavelet Transform: Two Dimensional Wavelets and Multipolar Approximations", J. Geophys. Research {108} (2003) 2296.

M. A. Vallee, P. Keating, R. S. Smith & C. St-Hilaire, ``Estimating Depth and Model Type using the Continuous Wavelet Transform of Magnetic Data", Geophysics {69} (2004) 191.

G. R. J. Cooper, ``Interpreting Potential Field Data using Continuous Wavelet Transforms of their Horizontal Derivatives", Computers and Geosciences {32} (2005) 984.

A. Chamoli, R. P. Srivastava & V. P. Dimri, ``Source Depth Characterization of Potential Field Data of Bay of Bengal by Continuous Wavelet Transforms", Ind. Jour. Marine. Sc. {35} (2006) 195.

P. Sailhac, D. Gibert & H. Boukerbout, ``The Theory of the Continuous Wavelet Trans-form in the Interpretation of Potential Fields: A Review", Geophysical Prospecting {57} (2009) 517.

A. Chamoli, ``Wavelet Analysis of Geophysical Time Series", Journal of Earth Science India {2} (2009) 258.

T. O. Lawal & L. I. Nwankwo, ``Wavelet Analysis of High Resolution Aeromagnetic (HRAM) Data over Part of Chad Basin, Nigeria", Ilorin Journal of Science {1} (2014) 110.

N. G. Obaje, ``Geology and Resources of Nigeria: Lecture Notes in Earth Sciences", Springler-Verlag, Berlin Heidelberg (2009) 120.

M. O. Odebode, ``A handout on Geology of Boron (Chad) Basin, Northeastern Nigeria", (2010).

G. J. Genik, ``Petroleum Geology of Cretaceous-Tertiary Rift Basins in Niger, Chad and Central African Republic", American Association of Petroleum Geologists, Bull {77} (1993) 1405.

T. O. Lawal, J. A. Sunday, L. I. Nwankwo, M. M. Orosun, K. A. Yusuf & S. O. Ige, ``Depth Estimate and Mapping of Source Geometries from High Resolution Aeromagnetic (HRAM) Data of Benisheikh, Nigeria", IOP Conf. Series: Earth and Environmental Science {173} (2018) 012034.

Y. Xu, H. Tianyao, L. Zhiwei, D. Qiuliang & Z. Lili, ``Regional Gravity Anomaly Separation using Wavelet Transform and Spectrum Analysis", J. Geophys. Eng. {6} (2009) 279.

A. Spector & F. S. Grant, ``Statistical Models for Interpreting Aeromagnetic Data", Geophysics {35} (1970) 293.

A. B. Reid, J. M. Allsop, H. Granser, A. J. Millett & I. W. Somerton, ``Magnetic Interpretation in Three Dimensions using Euler Deconvolution", Geophysics {55} (1990) 80.

M. Salk, O. Pamukcu & I. Kaftan, ``Determination of the Curie Point Depth and Heat Flow from Magsat Data of Western Anatolia", J. Balk. Geophy. Soc. {8} (2005) 149.

A. R. Bansal, G. Gabriel, V. P. Dimri & C. M. Krawczyk, ``Estimation of Depth to the Bottom of Magnetic Sources by a Modified Centroid Method for Fractal Distribution of Sources: An Application to Aeromagnetic Data in Germany", Geophysics {76} (2011) L11.

L. I. Nwankwo & A. T. Shehu, ``Evaluation of Curie-point Depths, Geothermal Gradients and Near-surface Heat Flow from High-resolution Aeromagnetic (HRAM) Data of the Entire Sokoto Basin, Nigeria", J. of Volcanology and Geothermal Res. {305} (2015) 45.

T. O. Lawal & L. I. Nwankwo, ``Evaluation of the Depth to the Bottom of Magnetic Sources and Heat flow from High Resolution Aeromagnetic (HRAM) Data of Part of Nigeria Sector of Chad Basin", Arabian Journal of Geosciences {10} (2017) 1.




How to Cite

Lawal, T. O., Sunday, J. A., Issa, S. O., Fawale, O., & Nwankwo, L. I. (2021). Delineation of Horizontal Locations and Estimation of Depth to Magnetic Source Geometries of Dubumbali, North-East Nigeria. Physics Memoir - Journal of Theoretical & Applied Physics, 3(1), 25–37. Retrieved from



Geophysical, Space and Atmospheric Physics