Logo link to homepage

Report on Las Pilas-El Hoyo Complex (Nicaragua) — December 1980

Las Pilas-El Hoyo Complex

Scientific Event Alert Network Bulletin, vol. 5, no. 12 (December 1980)
Managing Editor: David Squires.

Las Pilas-El Hoyo Complex (Nicaragua) Small vapor plume

Please cite this report as:

Global Volcanism Program, 1980. Report on Las Pilas-El Hoyo Complex (Nicaragua) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 5:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198012-344080

Las Pilas-El Hoyo Complex


12.4922°N, 86.6786°W; summit elev. 1088 m

All times are local (unless otherwise noted)

In late 1980 a small continuous vapor plume was still being emitted from the top of the kilometer-long crack in the summit.

Geological Summary. Las Pilas-El Hoyo volcanic complex, overlooking Cerro Negro volcano to the NW, includes a diverse cluster of cones within about a 3-km-diameter area. A N-S-trending fracture system cutting across the edifice is marked by numerous 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 and possible distinct magmatic system. 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, eruptions of Las Pilas took place in the 1950s from a fissure that cuts the eastern side of the 700-m-wide crater and extends down the N flank.

Information Contacts: R. Stoiber, S. Williams, H.R. Naslund, L. Malinconico, and M. Conrad, Dartmouth College; A. Aburto, D. Fajardo B., Instituto de Investigaciones Sísmicas.