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Abstract
A 2-D resistivity survey was carried out in UBTH, Edo State, a sedimentary terrain of South- South Nigeria. The Wenner-Schlumberger alpha electrode configuration was engaged through out in this study. To obtain a good 2-D picture of the subsurface, the coverage of the measurements must be 2-D as well. The equipment used to take the resistivity values was the
Pasi Earth Resistivity meter. The data from each 2-D survey line was inverted independently with RES2DINV to give 2-D cross-sections with RMS error of 8.15%. A contoured pseudosection conveys a qualitative two- dimensional resistivity variation with
depth within the subsurface. The inversed model resistivity sections created models for the subsurface resistivity using an iterative smoothness constrained least square inversion and are interpreted to generate the subsurface geologic characteristics. Results from 2-D inversed resistivity section showed that the first line with resistivity of laterites ranges from 800-1500Ωm, while that of lateritic soils ranges from 120-750Ωm from depth 2-10m. It can be seen that the resistivity of the sub-surface soils corresponds with the resistivity of laterites, thereby confirming the existence of laterites deposits in the survey area. From the resistivity block section obtained from line 2, it can be seen that the survey area has laterite deposits and lateritic soils, the top of the soil is composed of laterites and as we go deeper, it becomes lateritic soil because of the increase in the composition of non-lateritic
materials with depth.
Pasi Earth Resistivity meter. The data from each 2-D survey line was inverted independently with RES2DINV to give 2-D cross-sections with RMS error of 8.15%. A contoured pseudosection conveys a qualitative two- dimensional resistivity variation with
depth within the subsurface. The inversed model resistivity sections created models for the subsurface resistivity using an iterative smoothness constrained least square inversion and are interpreted to generate the subsurface geologic characteristics. Results from 2-D inversed resistivity section showed that the first line with resistivity of laterites ranges from 800-1500Ωm, while that of lateritic soils ranges from 120-750Ωm from depth 2-10m. It can be seen that the resistivity of the sub-surface soils corresponds with the resistivity of laterites, thereby confirming the existence of laterites deposits in the survey area. From the resistivity block section obtained from line 2, it can be seen that the survey area has laterite deposits and lateritic soils, the top of the soil is composed of laterites and as we go deeper, it becomes lateritic soil because of the increase in the composition of non-lateritic
materials with depth.
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