21 Oct La Palma eruption update 21st october 2021: The lava flow field is now up to 2,900 m wide
La Palma eruption update 21st october 2021: The lava flow field is now up to 2,900 m wide
The two active streams to the north have grown and coalesced and appear to be travelling to the SW of La Laguna Mountain. However, it cannot yet be ruled out that their growth and the changing topography may mean the flow travels northwards in the future, which is the fear that prompted the preventative evacuation on the afternoon of the 20th October. The flow to the north closest to the sea remains at 80 m from the cliff, and there have been minimal contributions to this flow in the last 24 hours. Regarding eruptive activity, there are currently five active vents, four strombolian vents in the main cone, and one vent showing only lava emission. The area affected is now 825 hectares, with the lava flow field now 2,900 m across at its widest point.
Earthquake activity was again increased, with almost all events recorded at intermediate (10-15 km) depth. 141 events were recorded, peaking at 4.4 mbLg. SO2 emissions were also increased, at 28,740 tons per day, although this is an underestimate, and the ash and gas plume reached 4000 m. The tremor remains high, with pulses of intensification. Deformation remains stable at stations closest to the eruption, although a slight regional deflation is still recorded further from the eruption. However, SO2 concentrations were low across the entire island, with no stations coming close to the hourly threshold. PM10 concentrations were also relatively low across most stations, although the daily threshold (50 μg/m3) was exceeded at the El Pilar and Los Llanos stations.
(Above) A video of the eruption showing the number of active vents showing different styles of eruptive activity. Video credit: INVOLCAN
Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC, Copernicus EMS
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Interactive Lava Flow Map
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Interactive Earthquake Map
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