Afderà is an isolated rhyolitic stratovolcano located between the Erta Ale, Tat Ali, and Alayta ranges.  It lies at the intersection of three fault systems.  Young rhyolitic lava domes are aligned N-S at its southern foot.  Only a few late-stage satellitic cones are of basaltic composition.  Eruptions were reported in 1907 and 1915 from Afderà (Catalog of Active Volcanoes of the World).  However, on morphological grounds Afderà appears to be substantially older than adjacent volcanoes, and the reported eruptions were probably from Alayta volcano to the west.  The age of the most recent eruption of Afderà is not known, although the south-flank rhyolitic lava domes are too young to be dated by the Potassium-Argon method.