Structural Study And Its Effect On Thermal Activities Of Tulu Moye- Gedemsa Area

The Main Ethiopian Rift (MER) constitutes the northernmost part of thernEast African Rift System (EARS), connecting the EARS with the Afarrntriple junction and is an area characterized by active extensionalrntectonics and associated volcanic activities.rnThe area of investigation, Tulu Moye, is situated in the Main EthiopianrnRift (MER), northwest of Asela, close to the eastern margin of the rift. It isrna wide zone where tectonic and volcanic activities are concentrated. Thernaim of this study is therefore, to show the relationships betweenrnextensional structures (normal faults and tensional fissures) andrnassociated volcanic edifices with the aid of Geographic InformationrnSystem (GIS) for compilation of available geologic, structural and thermalrnfield investigations.rnBy integrating the Landsat images, aerial photographs and topo mapsrntogether with the field data the lithology and structures of the study arearnare mapped with better accuracy, minimum cost and shorter fieldrnseasons.rnVolcano – tectonic data showed a close relationship between densernQuaternary faulting and associated eruptions. Volcanic activity isrnbecoming more recent and young towards the central part of the arearn(west of the eastern escarpment).rnStructurally the area is generally characterized by intense quaternaryrnfaulting and fracturing. Three set of faults are mapped in the arearnnamely; NE – SW striking marginal normal faults, NW – SE to E – Wrntrending trans-rift faults and the youngest and active NNE – SSW to N –rnS striking faults of the Wonji Fault Belt (WFB).rnAlmost flat foot wall and hanging wall tilted away from the fault plane isrnthe typical morphology obtained from morphology data collected usingrnTrimble GPS. An approximate E – W direction of extension is obtainedrnfrom kinematic data collected at two selected sites. Inventory of thermal vents in the area is made using Trimble GPS. Thernrelationship between these thermal sites and tectonics of the area isrnclearly outlined. In such a way that, the vents follow the general NNE –rnSSW trend of the intensively and densely populated faults of the WonjirnFault Belt (WFB).

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