IMAGINING THE SUBSURFACE OF THE AREA BETWEEN THE GREAT HALL AND THE UNIVERSITY HALL, KNUST
Electromagnetic profiling using the Geonics EM34-3 conductivity metre has been carried out
in the area between the Great Hall and the University Hall of KNUST to map the subsurface
structures. The EM equipment was operated in the horizontal dipole (HD) and vertical dipole
(VD) modes with a 10 m intercoil spacing, probing to depths of 7.5 m and 15 m respectively
and 20 m intercoil spacing also probing to depths of 15 m and 30 m respectively. The results
revealed that the apparent conductivity values of the area are within the range of
3 to 31 mSm-1. In addition to the qualitative analysis of the profiling results, the data from the
four (4) different depths were collated and processed into four (4) contour maps which
showed the areas of high and low conductivity values were also generated from the collation
of the profile data. The contour maps showed that the zone closer to the Great Hall were more
conductive, this could partly be due to the bare wires found in that portion of the project area.
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