Application of Integrated Geophysical Methods to Map Geological Stractures and Assess the Ground Water Potential of the Legedadi-Legetafo-Ayat Prospective Area

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Addis Ababa University


This MSc thesis work entitled “Application of integrated geophysical methods to map geological structures and assess the groundwater potential of the Legedadi-Legetafo-Ayat prospective area" located in Central Ethiopia, Oromia National Regional State, Finfine Area Special Zone of North Shewa Zone, and Berek Woreda. The objectives of the study are to explore deep high potential groundwater saturated zones and map geologic structural elements which act as a hydraulic barrier that impedes or enhance the movement of the groundwater. The work is being undertaken by Water Works Design and Supervision Enterprise (WWDSE). Mainly the study was studied to solve the shortage of water for the Addis Ababa City. 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 has wide distribution and forms confined and unconfined aquifer system. The thickness of this formation is highly variable from more than 400 meters at Legetafo area to less than 50 meters in Becho plains and the second is Lower Basalt aquifer (LBA) which is composed of tertiary Tarmaber basalt composed of dominantly scoraceous basalt and Amba Aiba basalt. These lineaments can be group into four main systems based on their orientation .These are: NE-SW, NW-SE, N-S/NNE-SSW and E-W trending fracture systems.



Magnetic Anomalies and Pseudo and Geo-Electric Section, Magnetic and Electrical Properties of Earth Materials