La Palma volcano update: Volcanic tremor drops to half its previous value, activity lower

Вт, 2 ноя 2021, 17:06
Ash emission and lava flowing from the vent at La Palma this afternoon (image: Canarias TV live cam)
Ash emission and lava flowing from the vent at La Palma this afternoon (image: Canarias TV live cam)
Tremor amplitude showing the marked decrease today (image: IGN)
Tremor amplitude showing the marked decrease today (image: IGN)
The seismic signal shows it as well very well (image: IGN)
The seismic signal shows it as well very well (image: IGN)
Frequency of quakes over the past days (image: IGN)
Frequency of quakes over the past days (image: IGN)
The activity has been lower on most fronts today. Most notably, volcanic tremor dropped sharply at around noon local time to about half its values of the previous days average.
Whether this correlates to reduced lava effusion is difficult to say with certainly but at least likely. Lava continues to be seen arriving at the lower vent of the cone, now approx. 200 m tall, and from there mostly flowing into the tube system, but maybe it has been less in volume during the past day. In agreement with this interpretation is that the lava flows that advanced yesterday along the southern margins of the flow field also slowed down a lot and made almost no progress today.
The area of Las Norias, which has been the most threatened to become the next victim of lava flows reaching part of the Camino Aniceto road yesterday, still remains intact for now and can thus still hope to survive.
Ash emissions from the main crater remained intense, however, and produced a plume that rose to 3-4 km this morning. Different wind regimes brought much needed relief to the Ariadne valley, allowing sunshine to reach the ash-plagued area. But when one side of the island is free from the ash, the other usually suffers... The westerly winds pushed the ash cloud to the east and northeast, with the result that the airport located on the eastern coast had to close today.

Earthquakes have decreased as well to about half in numbers compared to most previous days. Since last evening's 4.6 quake at 8.24 p.m., no other quakes of similar size have occurred, but approx. 100 quakes of magnitudes between magnitudes of 2.5-3.6.
Deformation is still elevated, but shows a weak trend of decrease.
Measured gas emissions remain high, with some increase according to local news articles.

In the meanwhile, the army is helping to clean roofs from the heavy load of ash in some areas. This is particularly important to do before the (awaited) winter rains set in, which mixed with the ash create a cement-like mass and make for dangerous extra load, that could easily bring many roofs to collapse.

Предыдущие новости

Tue, 2 Nov 2021, 09:16
Aerial view of the only remaining access road to Puerto Naos now threatened to be cut off (image: El Time, s. link in text)
With lava effusion remaining high, most of it has been feeding the lava flows on the southern part of the flow field, in particular the ones named 3 and 9 on official maps. ... Read all
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