Report on Las Pilas (Nicaragua) — April 1992
Bulletin of the Global Volcanism Network, vol. 17, no. 4 (April 1992)
Managing Editor: Lindsay McClelland.
Las Pilas (Nicaragua) Small gas plume
Please cite this report as:
Global Volcanism Program, 1992. Report on Las Pilas (Nicaragua). In: McClelland, L. (ed.), Bulletin of the Global Volcanism Network, 17:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199204-344080.
12.495°N, 86.688°W; summit elev. 1088 m
All times are local (unless otherwise noted)
A persistent, very small gas plume was visible in late April, rising from the NE margin of the 1-km fissure formed in 1952. Weak activity has been reported from this fumarole since 1980.
Geologic Background. Las Pilas volcanic complex, overlooking Cerro Negro volcano to the NW, includes a diverse cluster of cones around the central vent, Las Pilas (El Hoyo). A N-S-trending fracture system cutting across the edifice is marked by numerous well-preserved flank vents, including maars, that are part of a 30-km-long volcanic massif. The Cerro Negro chain of cinder cones is listed separately in this compilation because of its extensive historical eruptions. The lake-filled Asososca maar is located adjacent to the Cerro Asososca cone on the southern side of the fissure system, south of the axis of the Marrabios Range. Two small maars west of Lake Managua are located at the southern end of the fissure. Aside from a possible eruption in the 16th century, the only historical eruptions of Las Pilas took place in the 1950s from a fissure that cuts the eastern side of the 700-m-wide summit crater and extends down the N flank.
Information Contacts: S. Williams, Arizona State Univ.