The paleomagnetic and tectonic investigation was conducted on Gedemsa MagmaticrnSegment, Central Main Ethiopian Rift. The main objective of this study was to investigaterncrustal block rotation of the Gedemsa magmatic segment and to identify the magnetizationrncarrier minerals in the sampled rock units. To address the set scientific objectives, a total ofrn170 core samples (from 23 sites) were sampled and analysed from the outcrop of basalts,rnignimbrites, volcanic tuffs and rhyolite units. From these samples a total of 243 specimensrnwere prepared. The specimens were then subjected to progressive demagnetization to isolaternthe ChRM from the secondary overprint magnetization, and impulse magnetization (23rnspecimens) to identify magnetization carrier minerals. Rock magnetic experiments show thatrnthe dominant magnetic minerals are titanomagnetite, magnetite, titano-hematite and smallrnamount of hematite. The demagnetization analyses reveal two components (low stability andrnhigh stability components) of Natural Remanent Magnetization (NRM). Demagnetizationrnprocess removes the low stability components by applying up to 30mT or by heating up torn520oC. The high stability ChRM components were isolated above those steps and the ChRMrnvector direction characterized to be directed towards the origin with a straight line segment.rnAll the selected sites show normal polarity. An overall mean direction calculated fromrnindividual accepted site mean directions were D=359.10, I=9.60, N=20, K =20, Î±95=7.50.rnWhen these observed mean directions are compared with the mean expected referencerngeomagnetic field direction for stable Africa (D=10, I=13.50, N=32, K=105.6, and Î±95rn=2.5), from the apparent polar wander path reference curve for Africa, found to bernstatistically different in small amount. This suggests that a small amount of counterclockwiserncrustal block rotation (~30) about the vertical axis has occurred at the GedemsarnMagmatic Segment relative to stable Africa. The result is in agreement with most of otherrnpaleomagnetic investigations which advocates an increasing magnitude of counter-clockwisernvertical axis rotation towards the north which characterised the heterogeneous deformationrnof the Main Ethiopian Rift. The study area is characterised by normal faults with NNE-SSW,rnNE-SW and some N-S orientation which are part of the WFB.