20 Nov La Palma eruption update 20th November 2021: The eruption is now a VEI 3 based upon the amount of material emitted
La Palma eruption – 20th November 2021
The cumulative amount of material expelled by the eruption so far is thought to have reached the threshold value (10 million m3) for the classification of the eruption to change from a Volcanic Explosivity Index (VEI) 2 eruption to a VEI 3 eruption. However, PEVOLCA were keen to explain that this value only represents the amount of material emitted by the eruption and does not imply any changes to the eruption dynamics. Elsewhere, changes in the wind direction and ash dispersal have caused the closure of La Palma airport, with flights being cancelled. The three active lava flow fronts from the 19th remain, with the flow between La Laguna Mountain and Todoque Mountain advancing 130 m across new farmland. The rate of seismicity remained low-medium. 77 events were recorded, with similar amounts at both intermediate (10-15 km) and deep (30-45 km) depths, with the day’s largest earthquake being a mbLg 4.6 event at 37 km depth.
Volcanic tremor remains low, whilst the local inflation observed at the LP03 GPS station in Jedey closest to the eruption increased from 4 cm to 6 cm, although it is beginning to show a partial reversal. A small weakening regional deflation signal remains seen in the other stations. SO2 emissions were similar to the 19th at 7,000-18,000 tons per day, whilst the ash and gas plume was measured at 3,200 m. However, satellite measurements imply current SO2 emissions are lower than the start of the eruption. Air quality decreased in the early hours; SO2 values exceeded the hourly limit threshold (350 μg/m3) twice in Tazacorte and increased generally in all stations, although all stations returned to good levels throughout the day. PM10 levels remained low in all stations again, with none exceeding the daily limit threshold (50 μg/m3).
Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC, Copernicus EMS
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