Global Volcanism Program | Image GVP-07611
Izalco volcano was once known as the "Lighthouse of the Pacific" for its persistent incandescent nighttime displays. It was constructed on the southern flank of Santa Ana volcano, whose flat-topped summit is visible to the left of Izalco. At the right is Cerro Verde, a basaltic-to-andesitic pyroclastic cone on the SE flank of Santa Ana. Frequent strombolian eruptions have left the flanks of Izalco unvegetated; dark-colored lava flows at its base issued from both summit and flank vents and extend up to 7 km from the volcano.
Photo by Lee Siebert, 1999 (Smithsonian Institution).