BackgroundAlid is an isolated, dissected volcano in the central Danakil depression. The volcano is elongated in an E-W direction perpendicular to the orientation of the Alid graben. Alid consists of a structural dome of uplifted sedimentary rocks, capped by basaltic-to-rhyolitic lava flows, that rises 700 m above the graben floor. Late-stage rhyolitic eruptions during the late Pleistocene ejected rhyolitic pumice. Steep-sided lava flows drape the flanks of the structural dome, which was produced by intrusion of a silicic magma body. A 2 x 3 km graben cuts the top of the dome, and the crater that produced the plinian eruption occupies the western third of the summit depression. Vast lava fields of probable Holocene age originating from fissure vents bank up against the flanks of Alid to the NW and SE. Small cones and craters that were the source of the flows are localized along NNW-trending fissures. Fumarolic activity continues from broad areas on the northern summit and flank.
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8 | NASA FIRMS