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.The area is characterized by three sets of intense quaternary faults.
