Based on reports from the Mexico City MWO, the Washington VAAC reported that an ash plume from Colima rose to an altitude of 7.3 km (24,000 ft) a.s.l. and drifted W on 26 November. Observations of satellite imagery showed a plume to the NNE. Observers reported that steam and steam-and-ash plumes rose to altitudes of 3.9-4.6 km (12,800-15,100 ft) a.s.l. and drifted N and SW on 26, 27, and 29 November and during 3-4 December.

Geological Summary. The Colima complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the high point of the complex) on the north and the historically active Volcán de Colima at the south. A group of late-Pleistocene cinder cones is located on the floor of the Colima graben west and east of the complex. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km-wide scarp, breached to the south, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, producing thick debris-avalanche deposits on three sides of the complex. Frequent recorded eruptions date back to the 16th century. Occasional major explosive eruptions have destroyed the summit (most recently in 1913) and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth.

Sources: Gobierno del Estado de Colima, Washington Volcanic Ash Advisory Center (VAAC)