International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2528

Full Length Research Paper

Estimation of depth to magnetic source bodies of Nsukka and Udi areas using spectral analysis approach

Gladys Ujunwa Edeh
  • Gladys Ujunwa Edeh
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar
Johnson Uchenna Abangwu
  • Johnson Uchenna Abangwu
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar
Agatha Ngozi Okwesili
  • Agatha Ngozi Okwesili
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar
Mirianrita Ngozi Ossai
  • Mirianrita Ngozi Ossai
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar
Daniel Nnaemeka Obiora
  • Daniel Nnaemeka Obiora
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar


  •  Received: 18 April 2017
  •  Accepted: 05 July 2017
  •  Published: 16 July 2017

Abstract

The study was aimed at estimating the depth to magnetic source bodies in Nsukka and Udi areas which falls within the Anambra basin. Aeromagnetic data were used and Spectral Analysis approach was employed in the quantitative interpretation. The total magnetic intensity (TMI) contour map which ranges from -53.1 to 133.7 nanoTesla (nT) was separated into regional and residual contour maps to produce a residual aeromagnetic intensity contour map. The residual intensity varies from -51.2 to 59.6 nT while the regional intensity varies from -8.7 to 85.1 nT. Depth results obtained from spectral analysis revealed two depth sources; the shallower magnetic source bodies and the deeper magnetic source bodies. The depth of shallower magnetic sources ranges from 314.12 to 1061.05 m with an average depth value of 632.32 m, whereas the depth of deeper magnetic sources vary from 1465.90 to 5888.73 m with an average depth value of 3260.41 m.

Key words: Magnetic source bodies, depth estimation, spectral analysis, Nsukka and Udi areas, aeromagnetic data