Global Volcanism Program | Image GVP-03706
Ash roils above a pyroclastic flow, colored by the late-afternoon sun, sweeping down the SW flank of Colima on April 16, 1991. The pyroclastic flow was produced by collapse of unstable parts of the summit lava dome. A new lava dome that began growing on March 1 forms the small black mass at the summit. Later in the eruption, which ended in October, a lava flow traveled down to 2600 m altitude on the SW flank from the roughly 3850-m-high summit.
Photo by Alfredo Ramirez (pilot Ernesto Gómez Hofman), 1991 (courtesy Melchor Urzua, Protección Civil de Colima).