Report on Fuego (Guatemala) — August 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 8 (August 1987)
Managing Editor: Lindsay McClelland.
Fuego (Guatemala) Gas emission and microearthquakes
Please cite this report as:
Global Volcanism Program, 1987. Report on Fuego (Guatemala). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 12:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198708-342090.
14.473°N, 90.88°W; summit elev. 3763 m
All times are local (unless otherwise noted)
Gas emission from the crater and nearby microearthquakes continued through July. Seismic station FG3 registered 50 microearthquakes with S-P <= 2.0 seconds. The tiltmeter, at the same site, did not show abnormal variation. A small fumarole was also active about 100 m below the crater on the E flank.
Geologic Background. Volcán Fuego, one of Central America's most active volcanoes, is also one of three large stratovolcanoes overlooking Guatemala's former capital, Antigua. The scarp of an older edifice, Meseta, lies between Fuego and Acatenango to the north. Construction of Meseta dates back to about 230,000 years and continued until the late Pleistocene or early Holocene. Collapse of Meseta may have produced the massive Escuintla debris-avalanche deposit, which extends about 50 km onto the Pacific coastal plain. Growth of the modern Fuego volcano followed, continuing the southward migration of volcanism that began at the mostly andesitic Acatenango. Eruptions at Fuego have become more mafic with time, and most historical activity has produced basaltic rocks. Frequent vigorous historical eruptions have been recorded since the onset of the Spanish era in 1524, and have produced major ashfalls, along with occasional pyroclastic flows and lava flows.
Information Contacts: E. Sánchez, INSIVUMEH.