Journal de géologie et géophysique
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Applications of Magnetic Method in Mapping Subsurface Structures in the Ziway Langano Corridor Central Main Ethiopian Rift

Mesfin Tadesse Wolde

This paper aimed to map subsurface structural influences on groundwater flow in the Ziway- Langano Corridor area, located in the central main Ethiopian rift using the magnetic method. It is determined that the tectonic setting and rock types of an area is important in establishing the distribution of the groundwater flow. The existence of subsurface structures which include faults, fractures, and veins have been investigated in the Ziway-Langano Corridor using a tilt derivative magnetic map compiled for the study area. These geophysical investigation results have identified subsurface geologic structures that are responsible for the flow of groundwater 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 paper 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.