Report on Colima (Mexico) — March 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 3 (March 1987)
Managing Editor: Lindsay McClelland..
Colima (Mexico) Increased fumarolic activity; A-type events
Please cite this report as:
Global Volcanism Program, 1987. Report on Colima (Mexico). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 12:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198703-341040.
19.514°N, 103.62°W; summit elev. 3850 m
All times are local (unless otherwise noted)
The Univ of Colima (37 km S of the volcano) reported that a sulfur smell and increased fumarolic activity were noticeable on 2 March and twice during the next few weeks. A seismic station near the university detected a few small A-type earthquakes/day. The Instituto de Geofísica is installing a portable seismic station at the base of the volcano. A sulfur smell had not been reported for at least 10 years.
Geologic Background. The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4320 m high point of the complex) on the north and the 3850-m-high historically active Volcán de Colima at the south. A group of cinder cones of late-Pleistocene age is located on the floor of the Colima graben west and east of the Colima complex. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km-wide caldera, 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, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth.
Information Contacts: S. de la Cruz-Reyna, UNAM.