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La Palma volcano update: Eruptive activity remains spectacular, but continues decreasing trend

Пн, 22 ноя 2021, 18:45
Lava flows in large channels near La Laguna today (image: INVOLCAN /twitter)
Lava flows in large channels near La Laguna today (image: INVOLCAN /twitter)
Current tremor amplitude past 7 days (IGN)
Current tremor amplitude past 7 days (IGN)
The eruption column this morning (image: IGN)
The eruption column this morning (image: IGN)
Earthquakes under La Palma during the past 3 days (image: IGN)
Earthquakes under La Palma during the past 3 days (image: IGN)
Current seismic signal at La Palma's TBT station showing the larger quakes today (image: IGN)
Current seismic signal at La Palma's TBT station showing the larger quakes today (image: IGN)
Despite the spectacular display of lava flows traveling and reaching the sea again today, the overall tendency of the eruption remains on a very slow, gradual decreasing trajectory.
At the vents, the activity had been relatively calm last evening and during the night, as observers reported not hearing much and not seeing much lava being ejected. However, it likely increased again in the morning, as explosive activity remains significant during phases, when it creates ash plumes that rise up to 10,000 ft (3,000 m) altitude and drift towards the east (where the airport is located, forced to stop its operations).
All the time, lava effusion continues, as the actively flowing lava flows are proving. Besides the spectacular lava flow feeding the new delta, along and partially on top of the flow labelled #7, at least 3 other lava-tube fed flows remain active as well (#1, #2, and #9, which more less have merged into one large lobe).

However, it is likely that the overall flow rate is less than some weeks ago, if this correlates with the volcanic tremor that continues to be at low levels - albeit with short-lived spikes - and follows the general decreasing trend.
Gas emissions although still high have been dropping over the past days to around 900-1300 tons per day of SO2, while total CO2 emissions remain similar as in the past days at 2,000-2,300 tons per day. Similarly, ground deformation has returned to the state before the most recent inflation pulse and associated magma surge during 17-19 Nov, reverting (or resetting) all of the vertical and most of the horizontal ground displacements that had manifested themselves during this period, the Instituto Geográfico Nacional (IGN) reported. In other words, the additional magma that caused it, by entering the shallow plumbing system under the vent area, should have all come out by now.
However, despite the clear decreasing trend, a near end of the eruption is probably not in sight yet.
Here are some videos of the activity today:

Earthquakes remain at similar numbers and intensity as in the past days. During the latest 24 hour reporting window, IGN has detected 76 earthquakes, with most of them being in the deeper layer below 30 km depth. 6 quakes were felt on the island today. The largest was a magnitude 4.8 quake this morning at 8.09 a.m..

Предыдущие новости

Mon, 22 Nov 2021, 17:56
Due to the generation of the acid steam at the sea entry of the lava and the hazards these pose to people (as well as animals and plants), the government imposed a curfew neighboring coastal regions. ... Read all
Mon, 22 Nov 2021, 17:28
Steaming lava fronts as they enter the Atlantic Ocean today at La Palma's newest active lava delta (image: RTVE)
The lava flow that had been advancing in the past days south of La Laguna has reached the ocean today at around noon local time, creating the third time, lava flows enter the sea and create a new delta. ... Read all
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