Report on San Cristobal (Nicaragua) — December 1981
Scientific Event Alert Network Bulletin, vol. 6, no. 12 (December 1981)
Managing Editor: Lindsay McClelland.
San Cristobal (Nicaragua) Small irregular white gas plume; incandescence seen
Please cite this report as:
Global Volcanism Program, 1981. Report on San Cristobal (Nicaragua) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 6:12. Smithsonian Institution.
12.702°N, 87.004°W; summit elev. 1745 m
All times are local (unless otherwise noted)
"The volcano continued to emit a small white irregular gas plume. SO2 emission rates were measured at very low levels, similar to those reported for November 1980 and January 1981. Some caving had occurred in the summit crater since March 1981, and incandescence was again observed."
Geologic Background. The San Cristóbal volcanic complex, consisting of five principal volcanic edifices, forms the NW end of the Marrabios Range. The symmetrical 1745-m-high youngest cone, named San Cristóbal (also known as El Viejo), is Nicaragua's highest volcano and is capped by a 500 x 600 m wide crater. El Chonco, with several flank lava domes, is located 4 km W of San Cristóbal; it and the eroded Moyotepe volcano, 4 km NE of San Cristóbal, are of Pleistocene age. Volcán Casita, containing an elongated summit crater, lies immediately east of San Cristóbal and was the site of a catastrophic landslide and lahar in 1998. The Plio-Pleistocene La Pelona caldera is located at the eastern end of the complex. Historical eruptions from San Cristóbal, consisting of small-to-moderate explosive activity, have been reported since the 16th century. Some other 16th-century eruptions attributed to Casita volcano are uncertain and may pertain to other Marrabios Range volcanoes.
Information Contacts: R. Stoiber, S. Williams, R. Naslund, J.B. Gemmell, and D. Sussman, Dartmouth College; D. Fajardo B., Instituto de Investigaciones Sísmicas.