Structural Study and its Effect on Thermal activities of Tulu Moye- Gedemsa Area

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Addis Ababa Universty


The Main Ethiopian Rift (MER) constitutes the northernmost part of the East African Rift System (EARS), connecting the EARS with the Afar triple junction and is an area characterized by active extensional tectonics and associated volcanic activities. The area of investigation, Tulu Moye, is situated in the Main Ethiopian Rift (MER), northwest of Asela, close to the eastern margin of the rift. It is a wide zone where tectonic and volcanic activities are concentrated. The aim of this study is therefore, to show the relationships between extensional structures (normal faults and tensional fissures) and associated volcanic edifices with the aid of Geographic Information System (GIS) for compilation of available geologic, structural and thermal field investigations. By integrating the Landsat images, aerial photographs and topo maps together with the field data the lithology and structures of the study area are mapped with better accuracy, minimum cost and shorter field seasons. Volcano – tectonic data showed a close relationship between dense Quaternary faulting and associated eruptions. Volcanic activity is becoming more recent and young towards the central part of the area (west of the eastern escarpment). Structurally the area is generally characterized by intense quaternary faulting and fracturing. Three set of faults are mapped in the area namely; NE – SW striking marginal normal faults, NW – SE to E – W trending trans-rift faults and the youngest and active NNE – SSW to N – S striking faults of the Wonji Fault Belt (WFB). Almost flat foot wall and hanging wall tilted away from the fault plane is the typical morphology obtained from morphology data collected using Trimble GPS. An approximate E – W direction of extension is obtained from kinematic data collected at two selected sites. Inventory of thermal vents in the area is made using Trimble GPS. The relationship between these thermal sites and tectonics of the area is clearly outlined. In such a way that, the vents follow the general NNE – SSW trend of the intensively and densely populated faults of the Wonji Fault Belt (WFB).



Tulu Moye- Gedemsa Area