Dabbahu

In 2005 a 60 km dyke, with 8 m opening, connecting  the Manda Hararo and Dabbahu regions occured (Wright et al. 2012). Following the 2005 dyke intrusion 12 more dykes occured at Manda Hararo, and are discussed seperately on the Manda Hararo page.  Wright et al. (2006) report that magma was injected along the 2005 dyke between depths of 2 and 9 km, corresponding to a total intrusion volume of 2.5 km³. Wright et al. (2006) also present a 3D deformation field for the Dabbahu rifting episode derived from satellite radar data. The deformation field showsthat the entire segment ruptured, making it the largest to have occurred on land in the era of satellite geodesy. They report that much of the magma appears to have originated from shallow chambers beneath Dabbahu and Gabho volcanoes to the north, where an explosive fissural eruption occurred on 26 September 2005.
Gradin et al. (2009) provides an alternative InSAR study. They report on the geometry of the dike and neighboring magma chambers and perform an inversion for the distribution of opening of the dike, as well as slip on rift border faults. Above the dike the find faults slip by an average 3 m, yielding an estimated geodetic moment of 3.5 × 10¹⁹ Nm. The conclude that Dabbahu was two-stage intrusion, whereby rifting in the northern Manda Hararo Rift was triggered by magma upwelling in the Dabbahu area, at the northern extremity of the magmatic segment.
One study (Hamling et al. 2009), using InSAR and GPS, report no subsidence at either of the volcanoes at the northern end of the segment, which partly fed the 2005 September dyke, during the 2007 5 km dyke. Pagli et al. (2014) have also looked at the 2007 dyke intrusion. Their results agree with the other studies.