IG reported that a notable increase in seismicity at Sangay began at around 1000 on 12 August and was followed by the effusion of a lava flow that descended more than 1 km on the SE flank.
Strombolian activity was visible at the summit.
Ash plumes rose as high as 3.5 km above the summit and drifted 500 km W and SW, past the coastline, and caused daily ashfall in the provinces of Chimborazo and Guayas during 12-16 August.
The Guayaquil International Airport canceled several commercial flights on 13 August due to the presence of ash in the atmosphere.
Seismicity decreased to previous levels by 16 August.
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)