Application of Integrated Geophysical Techniques to Map Deep Groundwater Potential Zones and Geological Structures at South-West Akaki, South-East of Addis Ababa, Ethiopia
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Date
2014-05
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Addis Ababa Universty
Abstract
This study entitled ‘Application of Integrated Geophysical Techniques to Map Deep
Groundwater Potential Zones and Geological Structures, South-West Akaki, South-East
of Addis Ababa, Ethiopia’ was done using Vertical Electrical Sounding and Magnetic
geophysical methods. The aims of the study are to investigate the deeper high potential
groundwater saturated zones and linear geologic structural elements which dissect the
study area and could possibly act as a hydraulic barrier that impedes or enhance the
movement of the groundwater. Further, the work is aimed at determining the depth to
water table and identification of drilling point through interpretation of the geophysical,
geological and borehole data. Geophysical data have been measured, processed and
interpreted in one and two dimensions using special software. The results of
interpretation indicate that the study area composed of two aquifers, the first is the Upper
Basalt aquifer which is slightly confined between alluvial deposits (upper) and Massive
Basalt and Trachytes (lower) and the second is Lower Basalt aquifer which is confined by
the Tarmaber Basalt. The depth of the upper aquifer is ranging from 40 to 70m while the
depth of the lower aquifer is greater than 250m. The area is dissected by fault elements of
NW–SE and NE–SW trend.
Key words: Magnetic anomalies and Pseudo and Geo-electric section; Magnetic and
electrical properties of Earth materials
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Keywords
Magnetic anomalies and Pseudo and Geo-electric section, Magnetic and electrical properties of Earth materials