Applications of Integrated Geophysical Techniques to Map Subsurface Structures, Contributing to Ground Water Flow in the Ziway – Langano Corridor, Central Main Ethiopian Rift

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Addis Ababa Universty


The aim of this MSc thesis is to evaluate subsurface structural influences on groundwater flow in the Ziway - Langano Corridor area located in the central main Ethiopian rift using integrated geophysical methods which include gravity and magnetic method. The study is deemed to be an essential resource in evaluating the subsurface geologic structures. The surface geology of the study area ranges in composition from volcanic rocks of rhyolite, pyroclastic, obsidian, and ignimbrite rocks, to sedimentary rocks of lacustrine sediment and alluvial deposits. It is determined that the tectonic setting and rock types of an area are important in establishing the distribution of the groundwater flow. Existence of subsurface structures which include faults, fractures, and veins have been investigated in the Ziway – Langano Corridor using horizontal gradient gravity map and tilt derivative magnetic map compiled for the study area. These geophysical investigation results have identified subsurface geologic structures which are responsible for the flow of groundwater from Lake Ziway towards Lake Langano. In addition to this, field observations made during the magnetic survey have confirmed the flow of ground water from Lake Ziway towards Lake langano. This conclusion is also confirmed by the existence of hot springs at the northern shore of Lake Langano which is missing at the southern shore of Lake Ziway. This work has shown that there are no east west structures that favor the flow of groundwater. Hence, the direction of groundwater flow in the study area takes place from Lake Ziway towards Lake Langano being controlled by the N-S and NE-SW oriented faults and fractures mapped in the Ziway – Langano corridor.



Ziway – Langano Corridor