La Palma volcano update: Earthquake activity and volcanic tremor remain intense

Mon, 11 Oct 2021, 09:50
09:50 AM | BY: T
Earthquakes and depths under La Palma during the past 48 hours
Earthquakes and depths under La Palma during the past 48 hours
Seismic trace and spectrum TBT station (image: IGN)
Seismic trace and spectrum TBT station (image: IGN)
The seismic activity under the island remains intense, but the quakes remain clustered in the same areas as before with no clear trend visible.
During the past 24 hours, there were 3 quakes of magnitude 4.0 or above, the largest being a widely felt magnitude 4.3 event last nigh at 10.46 p.m. In addition, there were 34 quakes between 3.0 and 4.0, and 88 quakes between 2.0 and 3.0. Most quakes occurred at depths around 10-15 km beneath the center of Cumbre Vieja, the same area affected early on in the earthquake swarm preceding the eruption, while a few, including the stronger ones above magnitude 4 occurred at depths of 35-40 km beneath the island.
The currently preferred interpretation remains that new batches of magma intrude into the deeper reservoirs currently feeding the eruption, but the absence of significant shallower quakes, along with the stagnant trend of ground deformation, suggests that the conduits towards the surface are open and able to cope with the supposed supply of magma at the moment. In other words, it is unlikely - at least right now - that the eruption opens new fissures in other areas.
Volcanic tremor remains similar, high levels as during the past days. This indicates that the magma effusion rate, likely in the order of 50-100 cubic meters per second, remains high.

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