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El Hierro volcano
shield volcano 1500 m
Canary Islands (Spain), 27.63°N / -17.99°W
Current status: normal or dormant (1 out of 5)
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El Hierro volcano eruptions:
2012 (?) (probable second submarine eruption in June-July west of the island), 2011-12 (Oct-Mar, submarine eruption near La Restinga), 1793
Typical eruption style:
mainly effusive, basaltic fissure eruptions
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El Hierro volcano (Canary Islands) news & activity updates

El Hierro volcano (Canary Islands): continuing earthquakes, volcanic tremor and eruption warning

Tuesday Jun 26, 2012 17:27 PM | BY: T

Reappearing volcanic tremor signal (IGN) at about 16h10 on 26 June
Reappearing volcanic tremor signal (IGN) at about 16h10 on 26 June
While the unusually strong earthquake swarm under El Hierro Island continues, harmonic volcanic tremor has reappeared short time ago at about 16h10 UTC.
The tremor, a low-frequency ground vibration, is thought to be caused by moving magma. It had been strong yesterday and correlated well with a southward propagation of earthquake locations, suggesting that magma at about 20 km depth flew from underneath the El Golfo area towards the EL Julan (south) coast, in a similar way as before the Oct 2011 eruption, but became blocked there, and did not reach the southern rift zone near La Restinga.
After the cease of tremor in the afternoon, earthquakes still continued at high rate, marking a record figure with over 180 quakes larger than M2 yesterday alone, and more than 150 quakes larger than M1.5 so far today.
In other words, pressure continued to cause wide-spread rock fracturing underground and cause small intrusions of fluids. Now, the re-appearance of tremor could mean that magma is moving again somewhere underneath the island. Where to and whether or not it might reach the surface and initiate a new eruption is difficult to know at the moment. It is essential to continue to monitor location and magnitude of earthquakes.

For the latest developments, please visit our Current Activity page.
Previous news
Monday, Jun 25, 2012
The strong seismic swarm continues and the location of earthquakes show a trend towards the south, suggesting that magma is moving towards the southern rift zone again, as it did in 2011. ... [more]
Localization of earthquakes during 24-25 June (IGN)
Monday, Jun 25, 2012
A seismic swarm, this time located under El Golfo and the central part of the island between Sabinosa village and Malpaso at 20 km depth under the crest of the El Golfo escarpment. The swarm started yesterday evening 24 June and is still ongoing as of morning 25 June. ... [more]
Tuesday, Jun 19, 2012
A new seismic swarm has started last night (18 June) under the El Golfo area. ... [more]
Sunday, Jun 17, 2012
Another seismic swarm with over 20 earthquakes at depths around 20-25 km under the El Golfo bay just north of the coast has occurred recently. 5 quakes were larger than magnitude 2, the largest being an mag 2.7 event. [more]

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