Seismic refraction and resistivity studies of part of Igbogbo township, south-west Nigeria
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Date
2009
Authors
Ayolabi, E.A
Adeoti, L
Oshinlaja, N.A
Adeosun, I.O
Idowu, O.I
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Scientific Research and Development
Abstract
Seismic refraction shooting and Electrical resistivity depth sounding have been
carried out at Igbogbo (Ikorodu area, Southwest Nigeria) to determine the structural
setting of the subsurface materials and groundwater potential.
A total of eighteen vertical electrical sounding using the schlumberger array of 500m
maximum spread and twenty-seven seismic refraction data using forward and
reverse shooting methods of lateral distance 42m along each profile were acquired
within the study area.
The results indicate the presence of three seismic refraction layers with the first layer
having velocity 150-366m/s and thickness 1.0-3.3m, representing topsoil. The second
refraction layer is composed of lateritic clay with thickness 4.5-10.5m and velocity
578-878m/s. The third refraction layer consists of sandy clay with velocity 1000-
2500m/s. The delineated refraction layers are characterized by increase in velocity
with depth. The geoelectric sounding clearly show that the subsurface layers are
characterized by topsoil, laterite, sandy clay, clayey sand, sand and clay with sand
acting as aquifer units. The two thick aquifer units mapped are capable of sustainable
industrial development in the area.
The seismic refraction shooting was able to delineate three layers because of the
energy source used which is consistent with the first three layers in geoelectric
sounding. To attain deeper depths of penetration using seismic refraction method, a
stronger energy source is recommended.
Description
Keywords
Resistivity , seismic refraction , aquifer units , groundwater , geoelectric sounding , topsoil
Citation
Ayolabi, E. A., Adeoti, L., Oshinlaja, N. A., Adeosun, I. O., & Idowu, O. I. (2009). Seismic refraction and resistivity studies of part of Igbogbo township, south-west Nigeria. Journal of Scientific Research and Development, 11, 42-61.