Report on Fuego (Guatemala) — 10 June-16 June 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
10 June-16 June 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Fuego (Guatemala). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 10 June-16 June 2015. Smithsonian Institution and US Geological Survey.
14.473°N, 90.88°W; summit elev. 3763 m
All times are local (unless otherwise noted)
INSIVUMEH reported that at 1830 on 12 June the seismic stations at Fuego detected a lahar. At 1930 a lahar, 25 m wide and 2-3 m deep, traveled S down the Trinidad drainage, carrying abundant volcanic material and blocks 1-2 m in diameter. During 13-16 June explosions generated ash plumes that rose 550-850 m above the crater and drifted 10-12 km WNW, W, SW, and S. Shock waves were detected, and incandescent tephra was ejected 50 m above the crater. Ash fell in areas downwind including La Soledad, Acatenango, and Sacatepéquez.
Geological Summary. 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.