TWO-DIMENSIONAL GEOELECTRICAL RESISTIVITY IMAGING OF THE AHMADU BELLO UNIVERSITY TEACHING HOSPITAL (ABUTH) PREMISES, SHIKA, ZARIA, NIGERIA
TWO-DIMENSIONAL GEOELECTRICAL RESISTIVITY IMAGING OF THE AHMADU BELLO UNIVERSITY TEACHING HOSPITAL (ABUTH) PREMISES, SHIKA, ZARIA, NIGERIA
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Date
2007-12
Authors
INICHINBIA, SONNY
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Abstract
The Ahmadu Bello University Teaching Hospital (ABUTH) is located along Zaria-
Funtua road, Shika, which is situated on the crystalline metamorphic rocks of the
northern Nigerian Basement Complex. It lies between latitudes 11o 7/ N and 11o 24/ N
and longitudes 7o 31/ E and 7o 50/ E and has an elevation of about 650 m – 700 m above
mean sea level.
The aim of this survey is to carry out a Two-Dimensional Geolectrical Resistivity
Imaging of the subsurface in the area. The objectives of the survey were to determine
the thickness of the overburden and the weathered basement, to resolve the overburden
layering and to evaluate the groundwater potential of the area; thus characterizing the
geologic setting at the surveyed area.
A modern and state-of-the-art field instrument, the ABEM Automatic LUND Imaging
System (Terrameter SAS 4000 and ES 464), produced by ABEM instrument AB, was
used to accomplish this task. This uses multi-core cables with takeouts at 5 m intervals,
having a total of 42 electrodes covering a spread of 200 m.
Six profiles were covered and the data was processed to display the variations of
electrical resistivities using the RES2DINV software. The results of this survey in
correlation with borehole data revealed three distinct layers: the overburden which is
about 16 m - 26 m thick having a resistivity range of about 194 Ωm – 1759 Ωm. The
weathered basement which is appreciably thick (about 5 m – 14 m), is highly fractured
and weathered, so constitutes a good aquifer having a resistivity range of about 0.687
Ωm – 678 Ωm. and the fresh crystalline basement having a resistivity of about 1223
Ωm. The fresh crystalline rock is at a variable depth of about 21 m - 40 m below the
surface.
Description
BEING A RESEARCH THESIS SUBMITTED TO THE
POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA,
NIGERIA
IN PARTIAL FULFILMENT OF THE REQUIREMENTS
FOR THE AWARD OF MASTER’S DEGREE (M. Sc.) IN APPLIED
GEOPHYSICS.
DEPARTMENT OF PHYSICS
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY, ZARIA,
NIGERIA.
DECEMBER, 2007
Keywords
TWO-DIMENSIONAL, GEOELECTRICAL RESISTIVITY IMAGING, AHMADU BELLO UNIVERSITY TEACHING HOSPITAL (ABUTH), PREMISES, SHIKA, ZARIA, NIGERIA