Report on Colima (Mexico) — 25 February-2 March 2004
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
25 February-2 March 2004
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2004. Report on Colima (Mexico). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 25 February-2 March 2004. Smithsonian Institution and US Geological Survey.
19.514°N, 103.62°W; summit elev. 3850 m
All times are local (unless otherwise noted)
According to the Universidad de Colima, during 17-20 February volcanic activity slightly decreased at Colima in comparison to the previous week. About three explosions occurred daily, producing ash columns to 2-3 km above the crater. Most of the columns drifted ENE and NE, depositing ash on the volcano's flanks. According to the Washington VAAC, during 24 February to 1 March several explosions produced plumes to ~3 km above the volcano.
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.