INSIVUMEH reported that during 14-15 and 17-18 June explosions from Fuego produced ash plumes that rose 300-800 m above the crater and drifted WSW, E, and NE. Explosions generated rumbling sounds and shock waves detected in areas as far as 6 km away. Tephra avalanches descended the SW flank, into the Ceniza drainage, and lava flowed 200 m SW, into the Taniluya drainage. Pulses of incandescence rose 50-75 m above the crater. During 18-19 June lava flows advanced 50 m and block avalanches reached vegetated areas.

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.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)