27 Sep La Palma eruption update 27th september 2021: Brief pauses in eruptive activity seen
La Palma eruption update 27th september 2021: Brief pauses in eruptive activity seen
The eruption has seen a large variation of activity, with increases and decreases in the intensity of Strombolian activity, as well as pulses of phreatomagmatic activity (characterised by white plumes rich in water vapour) and periods of no strombolian activity from the main cone. The first period of cessation was between 4:10-4:30 am local time, and similar activity with occasional weak ash-rich explosions was seen throughout much of the day. These cessations were accompanied with greatly reduced volcanic tremor values, and have been attributed to a temporary plugging of the conduit. From approximately 6:30 pm local time, continuous strombolian activity returned to the vents in the main cone and increased in intensity throughout the evening, accompanied with a sharp increase in volcanic tremor. The lava flows continue to advance and are located between 800-1000 m from the coast, although the northern lava flow front which reached Todoque mountain on the 26th has greatly slowed. Nonetheless, due to the potential hazards from explosions and noxious clouds of vapour when the lava contacts the sea, preventative confinement measures have been put in place for 300 people in the coastal areas of Tazacorte.
Regarding geophysical signals, volcanic tremor shows markedly more stability than previous days. The ash plume height exceeds 3000 m, although atmospheric changes mean ashfall is less intense than previous days. The SO2 emissions are greatly reduced due to the lack of eruptive activity, measured at 567 tons per day. Deformation however is now showing a definite period of stability at all stations. Earthquake activity has increased, and a seismic swarm between 5:00-7:30 am local time was recorded at around 10 km, in the same location as the initial swarm which began on the 11th September. In total, 16 earthquakes were recorded, peaking at 3.2 mbLg.
Sources: Government of the Canary Islands, PEVOLCA, Involcan, IGN, DSN, Cabildo La Palma, 112 Canarias, Tolouse VAAC
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