Applications Of Integrated Geophysical Techniques To Map Subsurface Structures Contributing To Ground Water Flow In The Ziway Langano Corridor Central Main Ethiopian Rift

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

Get Full Work

Report copyright infringement or plagiarism