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 spectrum and tremor amplitude (CRST station)
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.
Depth vs time of earthquakes at El Hierro volcano during the past 30 days
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
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.
Location of earthquakes under El Hierro since yesterday
A possible explanation includes a new magmatic intrusion at depth (magma accumulating at the lower crust-mantle boundary).
Update Thu 09 Jan 09:08
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).
GPS plots of stations in northern and western El Hierro (IGN)
GPS plots of stations in southern El Hierro (IGN)
Update Sun 05 Jan 09:15
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.
Map of yesterday's earthquakes at El Hierro
Current tremor amplitude / spectrum at CTAB station (western El Golfo)
Tremor is absent except perhaps on some of the stations in the western El Golfo area (CTAB station) and deformation has been stagnating.