La Palma eruption update 26th october 2021: The lava flows are thickening and widening
According to PEVOLCA, the latest reconfigurations and partial collapses have produced a more ‘favourable’ scenario regarding the paths of lava flows, as they are now largely directed west of the volcano and across previous flows. This is causing a widening and thickening of the flows, but only a small amount of already isolated land is being ‘filled in’ in this new configuration. Regarding seismicity, earthquakes continue at a high magnitude in the same area and depths as previous days, although with less frequency than previous days. 108 events were recorded, peaking at 4.9 mbLg.
Deformation at the station closest to the eruption showed an increase of 10 cm relative to previous days, whilst the rest of the network showed no change. This signal may have a magmatic origin, although it has not been accompanied by any marked change in other eruption parameters. SO2 emissions stayed high reaching values of 37,350 tons per day, although this is still an underestimated value, and the ash and gas plume reached 2000 m. The tremor remains high, with pulses of intensification. Air quality with respect to SO2 declined, with stations in Los Llanos and Puntagorda exceeding the hourly threshold (350 µg/m³) at times throughout the day, however the daily threshold (125 µg/m³) was not exceeded at any station. PM10 concentrations were low at all stations except Los Llanos, which was above the hourly threshold (50 µg/m³) between 10am-1pm local time.
Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC, Copernicus EMS
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