DELINEATION OF FAULTS AND CAVITIES USING GRAVITY TECHNIQUES: AN IMPLICATION FOR ROAD CONSTRUCTION, SOUTH-SOUTH NIGERIA

Johnson C. Ibout (), Mfoniso U. Aka, Amarachukwu A. Ibe, Bethrand E. Oguama and Azuanamibebi D. Osu
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Johnson C. Ibout: University of Nigeria, Nsukka
Mfoniso U. Aka: University of Nigeria, Nsukka
Amarachukwu A. Ibe: Nigeria Maritime University
Bethrand E. Oguama: Federal College of Education (Technical) Omoku
Azuanamibebi D. Osu: Federal College of Education (Technical) Omoku

Malaysian Journal of Geosciences (MJG), 2021, vol. 5, issue 1, 31-34

Abstract: This study was carried out using five digitized aerogravity data to delineate near-surface structural faults, cavities, low-density zones and estimate the mass balance unit in foundations. Qualitative and quantitative analysis were performed in order to examines the depths to anomalous bodies, density/mass and stratigraphic features such as faults and cavities. The techniques employed were: Source parameter imaging (SPI), 3D Euler deconvolution, forward and inverse modeling. The results of the SPI shallow values range from -5.62 to -53.74 m and deep values range from 3.33 to 120 m. The 3D Euler deconvolution results range from -1892.2 to -1278.3 m for obscure and -12264 to 644.6 m for superficial formations. The forward and inverse modeling result shows the values of depth ranging from 2.5 to 4.8 km, density/mass range from (0.7 to 2.4) x 10-3 kg/m3 and (27 to 133) x 1010 kg of three profiles which is the parameter contrast of the gravity surveys. This shows sequential depths and density/mass contrast between the body of interest and the surrounding material which depicts the presents of faults, sedimentary basins and rock bearing minerals of shale/marble which comprises of air, water and sediment-filled formations. The information from this study has revealed the true nature of the subsurface and this will serve as a guide during road construction.

Keywords: microgravity; aerogravity; SPI; Euler deconvolution; sedimentary basin. (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbnmjg:v:5:y:2021:i:1:p:31-34

DOI: 10.26480/mjg.01.2020.31.34

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