Whakaari/White Island volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 1 September-7 September 2021 (New Activity / Unrest)

GeoNet reported that beginning at 0630 on 2 September minor ash emissions from the active vent at Whakaari/White Island were visible in webcam images. The emissions were observed in satellite images drifting SW and reaching the Bay of Plenty coastline. GeoNet noted that short episodes of minor ash emissions had been recorded during the previous few weeks, though none were as sustained as the 2 September episode.
Minor ash emissions were also recorded on 3 September, but then ceased. The webcam continued to record nighttime incandescence from the vent, at least through 6 September, suggesting that temperatures were likely 500-600°C. Steam-and-gas plumes were voluminous, and coupled with weather conditions, were easily visible from the coast.
Deformation measurement showed a broad area of subsidence around the vent area, possibly from the release of pressurized gas at depth and the more voluminous plumes. Additionally, the ash emissions may have possibly been caused by wall fragments falling into the vent. The Volcanic Alert Level remained at 2 and the Aviation Color Code remained at Yellow.

Sources: GeoNet, Wellington Volcanic Ash Advisory Center (VAAC)
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From: Global Volcanism Program, 2021. Report on Whakaari/White Island. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 1 September-7 September 2021. Smithsonian Institution and US Geological Survey.