Global Volcanism Program | Image GVP-09988
San Marcelino cinder cone (center) on the NE flank of Santa Ana volcano was the source of a basaltic-andesite lava flow that traveled 13 km to the east (left). Larde (1923) considered the 1722 lava flow to have originated from Izalco volcano, but most other sources place the birth of Izalco in 1770 and assign the 1722 eruption to San Marcelino. The 1722 lava flow originated from two vents at the eastern and western sides of San Marcelino.
Photo by Lee Siebert, 2002 (Smithsonian Institution).