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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1746

Advisors: Dr. Abera Alemu.
Copyright: 2008
Date Added: 16-Dec-2008
Publisher: Addis ababa university
Abstract: ABSTRACT In this thesis work two integrated geophysical surveys namely magnetic and electrical resistivity sounding have been carried out over the Sodere thermal springs area. The area is located within the Main Ethiopian Rift (MER), close to Nazareth town and is accessible on an all weather asphalt road on a detour from Nazareth-Assela main road. The Sodere thermal waters are one of the famous and relatively well-utilized centers in the country, which is being used for both recreational and healing purposes. Total magnetic field surveys at station spacing of 25 m well distributed and covering the thermal area were carried out. About 300 magnetic data points were obtained. Further, a total of ten VES stations, distributed to lie on three convenient traverses were measured using the Schlumberger symmetrical array. Maximum current electrode separation (AB/2) of up to 500m was used for the sounding survey. The results of the magnetic survey were presented in terms of profile plots and also contour maps which were later continued upward to remove near surface effects. The resistivity survey data were used to construct apparent resistivity pseudosections and the data were further interpreted and plotted to obtain geoelectric sections. From the magnetic anomaly map of the magnetic survey, the heat source is characterized by the lowest magnetic anomaly response interpreted as resulting from rock units that are forced to lose their magnetization due high temperature. Such areas with low magnetic anomaly and weak zones have been outlined. From the electrical survey, areas of low resistivity (typically < 20 Wm) observed on the pseudo- and geoelectric sections along Profiles-1and -2 are interpreted as hydro thermally altered zone and the overall low resistivity observed along Profile-3 is interpreted as highly water saturated region of the area because of the close proximity of the profile to the Awash river and the absence of structures that act as a barriers for ground water movement. ix Based on the analysis of the two geophysical methods and thermal manifestation, the area has geothermal potential for further development from central to northwest of the study area. Considering the limitations in depth of the electrical methods employed, further geophysical investigations are proposed to reinforce the outcome of the study.
Description: A Thesis submitted to the School of Graduate Studies, Addis Ababa University, in partial fulfillment of the requirements of the Degree Master of Science in Exploration Geophysics.
URI: http://hdl.handle.net/123456789/1746
Appears in:Thesis - Earth Sciences
Thesis - Earth Sciences

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