Report on Colima (Mexico) — June 1988
Scientific Event Alert Network Bulletin, vol. 13, no. 6 (June 1988)
Managing Editor: Lindsay McClelland.
Colima (Mexico) Fumarolic activity; rock avalanches
Please cite this report as:
Global Volcanism Program, 1988. Report on Colima (Mexico) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 13:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198806-341040.
19.514°N, 103.62°W; summit elev. 3850 m
All times are local (unless otherwise noted)
A group from the Centro de Investigación en Ciencias Básicas (CICBAS), Universidad de Colima, visited the volcano on 24-25 May to test future sites for a local seismic network. Guillermo Castellanos and Raul López measured average temperatures of 118°C adjacent to the main fumaroles. Emissions were dense, light-gray, and toxic. Large rockfall avalanches similar to the one that originated at the base of Colima's lava dome on 2 July 1987 (12:07) have been occurring periodically. Thick sulfur deposits coated the areas around fumaroles and avalanche source areas. Contrary to some public reports, rumbling noises were not heard during the visit.
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: G. Castellanos, R. López, G. Ornelas, J.C. Pérez, C.A. Ramírez, G. Reyes, and H. Tamez, CICBAS, Universidad de Colima.