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Home  >  Volume 33

The Effectiveness of Short Electrode Spacing In Geoelectrical Subsurface Investigation Using Dipole-Dipole Array by Alile O.M, Enoma .N and Osahon O.D. (Pages 329-336)
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In this study, the effect of the choice of short electrode spacing for geophysical investigation to map subsurface features was investigated. The features being mineral deposit and aggregate was the target. Profiles were established in parallel direction at two locations: Eguare primary school field and Amahor secondary school field both in Amahor community in Igueben local Government Area of Edo State. 2D Resistivity data was separately collected with the electrode spacing of 2.5m and 5.0m on the different locations respectively. Dipole-Dipole array configuration was used with the smoothness constraint inversion technique. The result obtained with the RES2DIVN software, showed that when the electrode spacing of 5.0m was used for the investigation the array type was not able to adequately map the mineral and aggregate present at that location. However, RMSerror value of 14.3% was obtained. On the other hand when the electrode spacing of 2.5m was used for the data collection and inverting with the same inversion technique showed that the array properly mapped the target which actually gave a detail and better resolution.RMSerror of 13.5% was obtained. The inversion of the 3Ddata using RES3DINV software gave 3D resistivity sections which were presented as horizontal depth slices. The result obtained from the 3Ddata has assisted us in getting information about the orientation of the target. The study revealed that shorter electrode spacing is better used for subsurface geophysical investigation especially if the target is not deeply buried into the subsurface.

Keword: 2D, 3D, Subsurface feature, Target, Investigation, Standard Constraint.