Report on Colima (Mexico) — March 1976
Natural Science Event Bulletin, vol. 1, no. 6 (March 1976)
Managing Editor: David Squires.
Colima (Mexico) Eruption decreases; E-flank lava flow slows
Please cite this report as:
Global Volcanism Program, 1976. Report on Colima (Mexico). In: Squires, D. (ed.), Natural Science Event Bulletin, 1:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.NSEB197603-341040.
19.514°N, 103.62°W; summit elev. 3850 m
All times are local (unless otherwise noted)
The eruption decreased during February and (presumably) March. The lava flows that were thought to be developing on the W side of the dome in late January did not develop at all. The lava flow on the E flank, ~ 2 km long, was moving very slowly. Other activity has almost stopped. De la Cruz last visited the volcano about 1 March 1976.
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, Universidad Nacional Autonoma de México (UNAM).