A new vent was possibly identified on the upper W flank. Strombolian activity at summit vents and SE-descending lava flows were visible during 23-24 November. Daily thermal anomalies over the volcano were often visible in satellite data. The plumes rose 970-2,100 m above the volcano and drifted NW, W, SW, and S. The sulfur dioxide emission rate had remained stable and low since June, with values less than 1,000 tons per day.ĭaily ash-and-gas plumes were identified by the Washington VAAC or in IG webcam views during 23-29 November. InSAR satellite data showed an inflationary trend of up to 5 cm per year all around the volcano except the E flank between 5 January 2020 and 13 November 2021. Though slight inflation began to be detected in June 2021 the trend was more pronounced in recent weeks. Most of the explosions were small and were recorded both by the seismic and acoustic networks. Strombolian activity began to dominate the eruptive style in July, though on 17 November the number of explosions increased to two per minute and remained at that level at least through 23 November. An increased number of explosions and an inflationary trend were recorded during the previous few weeks. The SE drainage, which had been scoured and widened by persistent pyroclastic flows during August 2019 to March 2020, had only widened from about 600 m to about 650 m during March-October. IG reported that thermal anomalies, persistent at Sangay since July, suggested continuous emission of lava flows and hot pyroclastic material from summit crater vents. The rate of lava effusion varied during 25-26 November the flow had begun cooling by the evening of 27 November. Within a few hours a lava flow was visible in the same area blocks from the end of the flow descended the Sciara del Fuoco, reaching the coastline. At 0751 on 25 November lava blocks originating from a hornito in the N2 area began rolling downslope. During the morning of 21 November intense spattering occurred at a vent between N1 and N2 produced a rheomorphic lava flow, formed by the accumulated spatter, on the upper middle part of the Sciara del Fuoco. A 60-m-line of fumaroles, oriented NNW, were situated on the Sciara del Fuoco, down-flank of Area N. Drone footage acquired on 20 November captured two C-S vents ejecting shreds of lava and one emitting gas. No explosions occurred at the S1 and C vents in Area C-S explosions at the two S2 vents occurred at a rate of 4-9 per hour and ejected coarse material as high as 80 m. Explosions from Area N vents (N1 and N2) averaged 6-17 events per hour explosions from two vents in the N1 vent ejected lapilli and bombs 80 m high and explosions at three N2 vents ejected material 80-150 m high. INGV reported that during 15-28 November activity at Stromboli was characterized by ongoing explosive activity from five vents in Area N (North Crater area) and four vents in Area C-S (South-Central Crater area). Complete updates are done about every 6-8 weeks, but information about newer eruptions can be found in the Weekly Report.
#Volcano box current over voltage update
An eruption listed here might have ended since the last data update, or at the update time a firm end date had not yet been determined due to potential renewed activity.
The most recently started eruption is at the top, continuing as of the Stop Date given. The Smithsonian / USGS Weekly Volcanic Activity Report (WVAR) for the week ending on 30 November 2021 includes the 25 volcanoes shown below marked "Yes" in the WVAR column (rollover for report).
Additional eruption data is available for recent years. Detailed statistics are not kept on daily activity, but generally there are around 20 volcanoes actively erupting on any particular day this is a subset of the normal 40-50 with continuing eruptions. An eruption marked as "continuing" does not always mean persistent daily activity, but indicates at least intermittent eruptive events without a break of 3 months or more. Overall, 48 volcanoes were in continuing eruption status as of 15 October 2021.
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