2-D CVES surveys using the Wenner configuration was carried out in 22 communities in the Tain Dis... more 2-D CVES surveys using the Wenner configuration was carried out in 22 communities in the Tain District, Ghana. This was done with the objectives of assessing the subsurface geology, identify high groundwater potential zones for drilling high-yielding boreholes that could yield sustainable amount of groundwater. The collected resistivity data were converted from the apparent resistivity to 2-D modelsection using the least-square inversion algorithm with the help of Res2DInv software. The 2-D resistivity model-sections produced a high quality structural resolution leading to the demarcation of the layering of various lithological units, weathered layers and identification of important structures such as joints, fractures and faults. Quantitatively, it can be observed that all the drilled wet wells have aquifer zones between 30 m and 60 m within sandstone, siltstone and phyllite granitic environments. The result of the borehole drill logs revealed that the aquifers were within weathere...
The 10.5 km diameter Bosumtwi meteorite impact crater in Ghana was formed about 1.07 million year... more The 10.5 km diameter Bosumtwi meteorite impact crater in Ghana was formed about 1.07 million years ago. It is the source crater of the Ivory Coast tektites strewn field. The crater is occupied by a lake of diameter 8.5 km. Electrical resistivity tomography (ERT) survey using the multi-electrode gradient array was carried out along sixteen radial profiles around the lake to determine the sediment/bedrock contact, impact related structures and the impact direction of the meteorite. The data were corrected for topography and inverted using the L1–norm. The subsurface images highlighted areas that are characterized by faults, fractures, lake sediments and impact related breccias such as allochthonous and parautochthonous breccias and dikes. The sediment/bedrock contact, which marks the crater geometry, was successfully mapped and it shows symmetry in the NE–SW direction and dips between 160 in the NE to 360 in the SW. The faults were mostly delineated in the west and they dip averagely ...
Suevite is a polymict breccia of clastic material derived predominantly from the crystalline base... more Suevite is a polymict breccia of clastic material derived predominantly from the crystalline basement. It is an impact-derived rock usually found at meteorite impact crater sites. In Ghana, suevites have been found at two locations at the Bosumtwi meteorite impact crater. The suevites are located in the Northern and Southern parts outside the crater rim. Due to the presence of different rock clasts of various sizes, the suevite exhibits physical properties that are quite different from those of other rocks such as granites, gneisses, etc. Suevites found in the North and South locations have some characteristic differences. In this paper, we report on the anisotropic behaviour of the compressional wave velocity Vp with pressure and azimuth for suevite samples collected from the North and South locations. The effect of pressure on Vp for the sample from the South is more pronounced than that from the North because of the high porosity of the sample at the South location. Also, the sei...
Integrated geophysical techniques involving 2D electrical resistivity imaging (ERI) and vertical ... more Integrated geophysical techniques involving 2D electrical resistivity imaging (ERI) and vertical electrical sounding (VES) were used to delineate groundwater potential zones for borehole siting in the Pru District of the Brong Ahafo Region of Ghana. The ABEM Terrameter LS was employed in the survey. A total of fifteen (15) 400 m - ERT profiles and thirty-one (31) VES points were investigated using the Schlumberger protocol. The Res1DINV and Res2DINV inversion software were used for data analysis. The 2D ERI images showed a lot of fractures within the subsurface of the study area. The results of the VES generally revealed either three or four subsurface geological layers at the selected points. The second and third layers were found to possess relatively low-to-moderate resistivity values indicative of potential aquifer zones. The resistivity of the fourth layer indicated the presence of slightly-fractured to fresh bedrock. The borehole logs depict four sequences: brownish or lateritic...
International journal of scientific and research publications, 2016
A Geophysical study involving 2D electrical resistivity imaging and shallow seismic refraction wa... more A Geophysical study involving 2D electrical resistivity imaging and shallow seismic refraction was conducted to provide support data for engineering site characterization. The case was a potential building site coterminous to the Business School in the precinct of the Kwame Nkrumah University of Science and Technology, (KNUST) Kumasi. The data of interest included depths to bedrock, the thickness and the degree of compaction of the weathered overburden and the variability in the top soil. Collocated resistivity and p-wave velocity data were acquired along fourteen traverses each of length 240 m oriented in the north to south direction. The inter-profile separation was 10 m. CVES resistivity data were collected using the multi-electrode ABEM Terrameter SAS 4000 Lund imaging system in the Wenner configuration with a basic array length of 12 m (minimum electrode spacing of 4 m) and was rolled-along to cover the total profile length. Along the same traverses, the ABEM Terraloc Mk 6, a 2...
2-D CVES surveys using the Wenner configuration was carried out in 22 communities in the Tain Dis... more 2-D CVES surveys using the Wenner configuration was carried out in 22 communities in the Tain District, Ghana. This was done with the objectives of assessing the subsurface geology, identify high groundwater potential zones for drilling high-yielding boreholes that could yield sustainable amount of groundwater. The collected resistivity data were converted from the apparent resistivity to 2-D modelsection using the least-square inversion algorithm with the help of Res2DInv software. The 2-D resistivity model-sections produced a high quality structural resolution leading to the demarcation of the layering of various lithological units, weathered layers and identification of important structures such as joints, fractures and faults. Quantitatively, it can be observed that all the drilled wet wells have aquifer zones between 30 m and 60 m within sandstone, siltstone and phyllite granitic environments. The result of the borehole drill logs revealed that the aquifers were within weathere...
The 10.5 km diameter Bosumtwi meteorite impact crater in Ghana was formed about 1.07 million year... more The 10.5 km diameter Bosumtwi meteorite impact crater in Ghana was formed about 1.07 million years ago. It is the source crater of the Ivory Coast tektites strewn field. The crater is occupied by a lake of diameter 8.5 km. Electrical resistivity tomography (ERT) survey using the multi-electrode gradient array was carried out along sixteen radial profiles around the lake to determine the sediment/bedrock contact, impact related structures and the impact direction of the meteorite. The data were corrected for topography and inverted using the L1–norm. The subsurface images highlighted areas that are characterized by faults, fractures, lake sediments and impact related breccias such as allochthonous and parautochthonous breccias and dikes. The sediment/bedrock contact, which marks the crater geometry, was successfully mapped and it shows symmetry in the NE–SW direction and dips between 160 in the NE to 360 in the SW. The faults were mostly delineated in the west and they dip averagely ...
Suevite is a polymict breccia of clastic material derived predominantly from the crystalline base... more Suevite is a polymict breccia of clastic material derived predominantly from the crystalline basement. It is an impact-derived rock usually found at meteorite impact crater sites. In Ghana, suevites have been found at two locations at the Bosumtwi meteorite impact crater. The suevites are located in the Northern and Southern parts outside the crater rim. Due to the presence of different rock clasts of various sizes, the suevite exhibits physical properties that are quite different from those of other rocks such as granites, gneisses, etc. Suevites found in the North and South locations have some characteristic differences. In this paper, we report on the anisotropic behaviour of the compressional wave velocity Vp with pressure and azimuth for suevite samples collected from the North and South locations. The effect of pressure on Vp for the sample from the South is more pronounced than that from the North because of the high porosity of the sample at the South location. Also, the sei...
Integrated geophysical techniques involving 2D electrical resistivity imaging (ERI) and vertical ... more Integrated geophysical techniques involving 2D electrical resistivity imaging (ERI) and vertical electrical sounding (VES) were used to delineate groundwater potential zones for borehole siting in the Pru District of the Brong Ahafo Region of Ghana. The ABEM Terrameter LS was employed in the survey. A total of fifteen (15) 400 m - ERT profiles and thirty-one (31) VES points were investigated using the Schlumberger protocol. The Res1DINV and Res2DINV inversion software were used for data analysis. The 2D ERI images showed a lot of fractures within the subsurface of the study area. The results of the VES generally revealed either three or four subsurface geological layers at the selected points. The second and third layers were found to possess relatively low-to-moderate resistivity values indicative of potential aquifer zones. The resistivity of the fourth layer indicated the presence of slightly-fractured to fresh bedrock. The borehole logs depict four sequences: brownish or lateritic...
International journal of scientific and research publications, 2016
A Geophysical study involving 2D electrical resistivity imaging and shallow seismic refraction wa... more A Geophysical study involving 2D electrical resistivity imaging and shallow seismic refraction was conducted to provide support data for engineering site characterization. The case was a potential building site coterminous to the Business School in the precinct of the Kwame Nkrumah University of Science and Technology, (KNUST) Kumasi. The data of interest included depths to bedrock, the thickness and the degree of compaction of the weathered overburden and the variability in the top soil. Collocated resistivity and p-wave velocity data were acquired along fourteen traverses each of length 240 m oriented in the north to south direction. The inter-profile separation was 10 m. CVES resistivity data were collected using the multi-electrode ABEM Terrameter SAS 4000 Lund imaging system in the Wenner configuration with a basic array length of 12 m (minimum electrode spacing of 4 m) and was rolled-along to cover the total profile length. Along the same traverses, the ABEM Terraloc Mk 6, a 2...
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