La Palma eruption update 30th september 2021: Lava flows show some stability

La Palma eruption update 30th september 2021: Lava flows show some stability

Daily summary

The lava delta continues to be fed by the active lava flows, which show some stability in that they are largely confined to within previous lava flows. However, there are also localised breakouts onto previously unaffected land. The lava delta has reached a thickness of 24 m and is now beginning to spread laterally. Surface activity at the main cone continues to show a mixed mechanism with strombolian activity from multiple vents in the main cone, and more effusive Hawaiian activity from a vent at the base of the NW sector on the main cone, with occasional phreatomagmatic pulses too. Throughout the morning of the 30th, an extensive fumarole field developed on the NE flank of the main cone. The continued presence of a thermal inversion is hampering the dispersal of volcanic gases and ash, leading to a decrease in air quality in the Aridane Valley. SO2 concentrations in Tazacorte peaked at ‘very high’ levels (>500 μg/m3) at 8:00 am local time and increases in SO2 concentrations have also been observed in Los Llanos de Aridane, along with reports of a ‘rotten egg’ smell, although these values do not currently represent a health hazard.

Earthquake activity continues to be concentrated near where the precursory seismic swarm began on the 11th September, as well as some earthquakes surrounding the eruptive centre. In total, 11 earthquakes were recorded, peaking at 3.5 mbLg. The ash plume height exceeds 2500 m, and the SO2 emissions are measured at 8,700 tons per day. Deformation continues to show a long-term trend of stability at all stations, and tremor also remains stable, at medium levels.

The lava flow is in the foreground showing up as very hot, but as soon as it reaches the sea the temperature drops dramatically.

A thermal image showing the front of the lava delta, where it meets the sea. The temperature scale is in degrees Fahrenheit. Image credit: INVOLCAN

Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC

Lava flows


Exclusion zone map

Exclusion zones shown here have been approximated from press releases from the Cabildo de La Palma and will not be exact, nor claim to be official maps of the exclusion zones. For official information, please contact the Cabildo de La Palma.

Official social media

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News articles

  • The Olive Press – La Palma volcano: Animals suffer and change behavior as eruption continues – here
  • Yorkshire Evening Post – The story of a leeds man who found himself in the middle of the La Palma volcano eruption – here
  • Insider – PHOTOS: lava from volcanic eruption continues to obliterate homes, roads and crops on an island in Spain – here

To see our full news archive, visit our open data section or click here.

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Eruption footage

News and Interviews

Witness Testimonies

Interactive Lava Flow Map

Notes: Use the button in the top right to open the map into full screen mode. Use the legend icon in the top left to see the legend and further information about the map. Click on individual days to see an outline of the lava flows on that day.

Interactive Earthquake Map

click here to enlarge

Notes: The size of the points represents the size of the earthquake, and the colour represents the depth. The map will also only show a certain number of points at once. For ease of use, we recommend you uncheck all dates and the satellite basemap from the legend in the top right, and inspect the earthquakes one day at a time.

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