05 Nov La Palma eruption update 5th November 2021: Seismicity and tremor have decreased in the last few days
La Palma eruption – 5th November 2021
The eruption continues to show variable strombolian activity, with multiple more explosive vents in the main cone, and a more effusive lava emission vent on the NW flanks of the main cone. The lava flows continue to flow across existing flows in the centre and south of the lava flow field, with minimal new land being affected at this time. Nonetheless, work continues on a second access road to Puerto Naos for large tonnage vehicles in the event the LP-211 road is cut off by lava flows in the south. Seismicity continues to decrease relative to the last week, with 37 earthquakes being recorded mostly at intermediate (10-15 km) depths, with the day’s largest earthquake being a mbLg 3.8 event at 35 km depth. Favourable meteorological conditions for air quality and the operation of the airport continue.
SO2 emissions decreased slightly and were measured at 26,000 tons per day, although this is underestimated relative to satellite measurements, whilst the ash and gas plume reached 3500 m. Satellite measurements suggests a downward trend in the SO2 emissions since the start of the eruption. Tremor continued the decrease seen on the 4th and is now at low levels, whilst deformation still remains stable in the proximal GPS stations, with slight deflation at distant stations. Air quality with respect to SO2 remains improved, with all stations on the island measuring reasonably good-good levels. PM10 levels remain at similar levels at all stations except Los Llanos, which maintains very unfavourable levels with a daily average of 213 μg/m3 (daily threshold 50 μg/m3). These sustained high concentrations are a reflection of the current eruption dynamics and prevailing wind direction at the altitude of the plume.
(Above) A video of the eruption taken northeast of the cone, showing intense ash emission and the temperatures within the plume using a thermal camera. Video Credit: IGN Spain
Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC, Copernicus EMS
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