Fukutoku-Oka-no-Ba volcano (Volcano Islands, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 11 August-17 August 2021 (New Activity / Unrest)
JMA reported that a large eruption at Fukutoku-Oka-no-Ba commenced around 0620 on 13 August based on satellite data. Ash plumes rose as high as 16 km (54,000 ft) a.s.l. and drifted W.
Wed, 11 Aug 2021, 06:0006:00 AM | BY: VN
The eruption was also confirmed during an overflight later that day. Video showed Surtseyan explosions ejecting black material above the ocean's surface, and ash plumes drifted W. Ash plumes identified in satellite images rose 12.2-16 km (40,000-54,000 ft) a.s.l. during 13-15 August; the height of the plume decreased afterwards though the eruption intermittently continued.
The Japan Coast Guard observed a new horseshoe-shaped island that was about 1 km in diameter during an overflight on 15 August. They also observed and photographed a notable pumice raft swirling with the currents as far as 60 km NW. JMA noted that the volcano last erupted in 2010 and frequent episodes of discolored seawater had been observed since then.
Sources: Japan Meteorological Agency (JMA), Japan Coast Guard, Tokyo Volcanic Ash Advisory Center (VAAC)
From: Global Volcanism Program, 2021. Report on Fukutoku-Oka-no-Ba. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 11 August-17 August 2021. Smithsonian Institution and US Geological Survey.
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