Volcanic unrest at El Hierro (Canary Islands): activity updates

new pulse of volcanic tremor near La Restinga ?
Update Mon 17 Mar 08:57
Current seismic signal at CRST station in La Restinga (IGN)
Current seismic signal at CRST station in La Restinga (IGN)
Current seismic spectrum and tremor amplitude (CRST station)
Current seismic spectrum and tremor amplitude (CRST station)
Depth vs time of earthquakes at El Hierro volcano during the past 30 days
Depth vs time of earthquakes at El Hierro volcano during the past 30 days
What looks like a new swarm of earthquakes accompanied by strong harmonic tremor appeared on the southernmost seismic station at La Restinga. If it is not due to some local, human-induced work or malfunction, it suggests that the quakes are very shallow, since they don't appear on the signals of other stations.
Whatever is happening there will probably become clearer soon.
The latest earthquake swarm in the NE part of the island had more or less stopped during the past 24 hours. Some GPS stations showed 2-4 cm uplift during the weekend, which supports the idea of a new deep magma intrusion.
New earthquake swarm
Update Sat 15 Mar 12:05
Location of earthquakes under El Hierro since yesterday
Location of earthquakes under El Hierro since yesterday
A new swarm of earthquakes started yesterday. So far, almost 200 tiny quakes (none above magnitude 3 so far) have occurred in a broad N-S oriented area beneath the NE part of the island at around 18 km depth.
A possible explanation includes a new magmatic intrusion at depth (magma accumulating at the lower crust-mantle boundary).
Update Thu 09 Jan 09:08
GPS plots of stations in northern and western El Hierro (IGN)
GPS plots of stations in northern and western El Hierro (IGN)
GPS plots of stations in southern El Hierro (IGN)
GPS plots of stations in southern El Hierro (IGN)
No new significant earthquake activity has occurred over the past week, and deformation has stabilized on all stations: the latest crisis can be regarded as over (but it is probably only a matter of time until the next one).
Update Sun 05 Jan 09:15
Map of yesterday's earthquakes at El Hierro
Map of yesterday's earthquakes at El Hierro
Current tremor amplitude / spectrum at CTAB station (western El Golfo)
Current tremor amplitude / spectrum at CTAB station (western El Golfo)
The island has remained calm with not much signs of volcanic unrest. Two small earthquakes (magnitudes 2.8 and 1.7) occurred at approx 10 km depth east of La Restinga yesterday, but so far, there have not been new ones since.
Tremor is absent except perhaps on some of the stations in the western El Golfo area (CTAB station) and deformation has been stagnating.
Update Tue 31 Dec 17:27
It seems more and more likely that the crisis is appraching an end (with the likelihood of a new eruption soon becoming less and less). Seismic activity has decreased to normal levels with no unusual signs over the past 24 hours. Deformation has been stagnating or mostly reverted to deflation at most stations.
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