In a special report from 3 August, IG reported that a new eruptive phase at Sangay began on 20 July, after 8 months without major surface activity.
The recent activity was characterized by low-energy ash plumes rising no more than 3 km above the crater rim, incandescent rocks rolling as far as 1 km down the ESE flank, and a possible lava flow on the same flank.
Minor amounts of ash fell in uninhabited areas to the W.
Based on Washington VAAC reports, IG noted two ash plumes on 20 July and one on 2 August that rose 2.3-3 km above the crater and drifted W and NW.
Numerous thermal anomalies detected during 2-3 August were aligned on the ESE flank.
Based on numerical weather prediction (NWP) models, satellite data, and information from the Guayaquil Meteorological Watch Office (MWO), the Washington VAAC reported that on 6 August an ash plume drifted W.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG) ,Washington Volcanic Ash Advisory Center (VAAC)