24 Oct La Palma eruption update 24th october 2021: Number of earthquakes significantly increases
La Palma eruption update 24th october 2021: Number of earthquakes significantly increases
The new lava flow that emerged on the afternoon of the 23rd continues to flow slowly parallel to the southern limits of the old flows and has been named stream 10 to aid its tracking. Elsewhere, the active flows are largely being fed by lava tubes and channels, although not much advance is seen on the surface at the lava fronts. Throughout the eruption, there have been a total of 9 different vents, although only four of them are currently active; three strombolian vents in the main cone, and a more effusive lava emission vent located on the NW flank of the main cone and forms a conelet. In the afternoon, multiple new lava emission centres opened both at the SE end of the eruptive fissure, and on the west flank of the main cone. Earthquake activity significantly increased, although almost all events remained recorded at intermediate (10-15 km) depth. 271 events were recorded, the most recorded in a single day since the eruption began, peaking at 4.0 mbLg.
SO2 emissions rose sharply relative to previous days, reaching values of 53,600 tons per day, although this is still an underestimated value, and the ash and gas plume reached 3200 m. The tremor increased, and reached the highest signal seen for a month. Deformation remains stable at stations closest to the eruption, although a slight regional deflation is still recorded further from the eruption, with the signal thought to be of deep origin. Regarding air quality, SO2 concentrations generally improved and none of the stations suffered exceedances of the hourly threshold (350 μg/m3), although brief high peaks were seen in Puntagorda and Los Llanos. Similarly, PM10 concentrations remained low in all stations except Los Llanos, which saw brief peaks above the daily 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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