High Quality Content by WIKIPEDIA articles! The 2011 Nabro eruption was an eruption of the Nabro stratovolcano in the Southern Red Sea Region of Eritrea, which began on 12 June 2011 after a series of earthquakes. The eruption has killed seven and possibly a further 31 people and emitted the highest levels of sulfur dioxide (SO2) ever observed from Earth`s orbit. The ash cloud from the eruption reached altitudes which disrupted airline traffic in the region. Until the eruption began, the volcano was thought to be extinct.