Global Volcanism Program | Image GVP-11630
A 150-m-high lava fountain rises on October 23, 2005 from one of four active vents that define the active fracture system at the base of the northern inner wall of Sierra Negra's caldera. An eruption began on October 22, 2005 from a 2-km-long, roughly E-W-trending fissure vent along the north caldera rim, initially producing a 15-km-high eruption column. Some lava flows traveled down the north flank, but the bulk of the lava flows traveled into the caldera and followed its east wall before being deflected by the southern caldera wall to the west.
Photo by Minard Hall, 2005 (Escuela Politecnica Nacional, Quito).
This image is made available under the Creative Commons BY-NC 4.0 license terms.