Characterization of Subsurface Densities Using Aerogravity Data of Okigwe and Environs


  • Isaac Owoicho Agada Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
  • Magnus Uzoma Igboekwe Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
  • Faustinus Chukwunweike Anyadiegwu Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria


Density, Gravity, Okigwe, Intrusion, Sedimentary, Basement


Communication in Physical Sciences, 2022, 8(3):355-363

Isaac Owoicho Agada, Magnus Uzoma Igboekwe and Faustinus Chukwunweike Anyadiegwu

Received: 25 January 2022/Accepted 01 July 2022

Density and its variations across rock materials govern gravity anomalies. As an important physical property of geologic materials, knowledge of rock densities provides vital information on subsurface structure and explorations. The study was carried out to model gravity anomalies and analyse the varying densities of subsurface materials within Okigwe and Environslocated between Latitudes 5˚30’N and 6˚00’N, and Longitudes 7˚00’E and 7˚30’E in South Eastern Nigeria. Using Oasis Montaj geophysical data processing tool, aerogravity dataset for Okigwe and environs as contained in the Okigwe aerogravity sheet 312 obtained from Nigeria Geologic Survey Agency (NGSA) was analysed, mapped, profiled and modelled inversely to reveal the subsurface with varying and unique densities. There are huge masses of igneous/ gneiss intrusions with densities of 2.80g/cm3 in a diagonal array from the NE to SW of the study area, with locations such as Ihube, okigwe town and Umuna featuring strategically. The entire Okigwe and environs is underlain by a thick Precambrian basement complex, having varying densities of 2.67g/cm3 and 2.76g/cm3. The huge basement complex of the study area is overlaid with sediments of various densities, ranging from sandstones (2.25g/cm3), and clay/shale/laterite (1.98g/cm3). At the NW extreme and SE wing around Obowo, Umuahia and environs, the subsurfaceis dominated by low density materials as projected by the negative gravity signatures observed in the Bouguer anomaly map. Materials with the highest densities were observed at the NE axis around ihube, Okigwe, the southern part of Isuochiand their environs.


Download data is not yet available.

Author Biographies

Isaac Owoicho Agada, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria

Department of Physics

Magnus Uzoma Igboekwe, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria

Department of Physics

Faustinus Chukwunweike Anyadiegwu, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria

Department of Physics


Alsadi, H.N. and Baban, E.N. (2014). Introduction to gravity exploration method – First Edition. Paiwand press. 203 pp.

Anyadiegwu, F. C., Aigbogun, C. O. & Eze, M. O (2021). subsurface characterization based on densities, heat sources and thickness of sediments obtained from inverse modelling of gravity data. International Journal of Geo-informatics and Geological Science, 8, 2, pp. 53-66.

Araffa, S.A.S., El-bohoty M., Heleika M.A., Mekkawi M., Ismail E., Khalil A. & EL-Razek E.M.A. (2018). Implementation of magnetic and gravity methods to delineate the subsurface structural features of the basement complex in central Sinai area, Egypt, NRIAG Journal of Astronomy and Geophysics, 7:1, 162-174.

Aspler, L.B., Pilkington, M., and Miles, W.F., (2003). Interpretations of Precambrian basement based on recent aeromagnetic data, Mackenzie Valley, Northwest Territories; Geological Survey of Canada, Current Research. C2, 11 p

Igboekwe, M.U., Agada, I.O. & Amos-Uhegbu, C (2021). Investigation of dumpsite leachate using electrical resistivity tomography at

Umueze-Ibeku, Umuahia, South-Eastern Nigeria.Journal of Scientific and Engineering Research, 6, 1, pp. 71-80.

Lowrie, W. (2007). Fundamentals of geophysics- Second Edition.Cambridge University Press, 381 pp

Omosanya, K. O., Mosuro, G. O., Laniyan, T. A.& Ogunleye, D (2012). Prediction of gravity anomaly from calculated densities of rocks.Pelagia Research Library -Advances in Applied Science Research, 3, 4, pp 2059-2068

Onyewuchi, R. A. & Ugwu, S. A (2017). Geological interpretation of the high resolution aeromagnetic data over Okigwe-Udi area, Anambra Basin, Nigeria, using 3-D Euler deconvolution and 2-Ds spectral inversion methods.Journal of Geography, Environment and Earth Science International 10, 1, pp 1-22

Pal, S.K., Bhattacharya, A.K. & Majumdar, T.J (2006). Geological interpretation from Bouguer gravity data over the Singhbhum-Orissa craton and its surroundings: A GIS approach. J. Ind. Geophysics. Union 10,4, pp.313-325.

Reynolds J.M. (1997) An introduction to applied and environmental geophysics. John Wiley & Sons Publisher