Sangay volcano (Ecuador) - Smithsonian / USGS Weekly Volcanic Activity Report for 22 December-28 December 2021 (Continuing Activity)

IG reported a high level of activity at Sangay during 21-28 December. Seismicity was characterized by daily explosions, long-period earthquakes, and signals indicating emissions. Weather clouds and rain sometimes prevented visual and webcam observations of the volcano, though almost daily ash-and-gas plumes were identified in satellite images by the Washington VAAC or in webcam views; plumes rose as high as 1.5 km above the volcano and drifted SE, S, SW, and W.
Multiple (33-73 per day) daily thermal anomalies over the volcano were visible in satellite data. On 25 December volcano observers near Macas reported hearing noises coming from Sangay, possibly due to favorable weather conditions, though the intensity of explosions had slightly increased. Crater incandescence and an active lava flow on the SE flank were visible at night during 27-28 November.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)
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From: Global Volcanism Program, 2021. Report on Sangay. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 22 December-28 December 2021. Smithsonian Institution and US Geological Survey.