IG reported that the eruption at Reventador was ongoing during 6-13 June. Seismicity was characterized by explosions, long-period earthquakes, harmonic tremor, and tremor associated with emissions. Though weather clouds hindered visual observations of emissions during 6-7 June, several explosions overnight ejected incandescent material onto the flanks; some of the material rolled down the E flank. During 7-10 June several steam-and-ash emissions rose as high as 1 km above the crater rim and drifted W. Crater incandescence was visible during overnight hours and incandescent blocks sometimes rolled 400-500 m down the flanks. Crater incandescence was visible overnight during 11-13 June. Weather conditions prevented views on 11 June. Gas-and-ash plumes rose 600-800 m and drifted W during 12-13 June. Servicio Nacional de Gestión de Riesgos y Emergencias (SNGRE) maintained the Alert Level at Orange (the second highest level on a four-color scale).

Geological Summary. Volcán El Reventador is the most frequently active of a chain of Ecuadorian volcanoes in the Cordillera Real, well east of the principal volcanic axis. The forested, dominantly andesitic stratovolcano has 4-km-wide avalanche scarp open to the E formed by edifice collapse. A young, unvegetated, cone rises from the amphitheater floor to a height comparable to the rim. It has been the source of numerous lava flows as well as explosive eruptions visible from Quito, about 90 km ESE. Frequent lahars in this region of heavy rainfall have left extensive deposits on the scarp slope. The largest recorded eruption took place in 2002, producing a 17-km-high eruption column, pyroclastic flows that traveled up to 8 km, and lava flows from summit and flank vents.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Servicio Nacional de Gestión de Riesgos y Emergencias (SNGRE)