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El Hierro volcano (Canary Islands, Spain): strong inflation and tremor - possible precursors to a new eruption

Do, 26. Dez 2013, 17:50
17:50 PM | VON: T
GPS measured deformation at El Hierro (IGN)
GPS measured deformation at El Hierro (IGN)
Although earthquakes have largely ceased for the moment, the island experiences ongoing rapid inflation and harmonic tremor, both signs that an eruption could be imminent.
The inflation in the SE part near El Pinar and La Restinga has reached almost 10 cm in just a few days by now.
Instead of new earthquakes, harmonic tremor (steady low-frequency ground vibration) has appeared 2 days ago and since then been gradually increasing. Both observations, as well as some single long-period earthquakes in the past days, are indicators of magma moving into the system and pressurizing it.
This means that the scenario of a new eruption has become more and more likely. It is impossible to say whether and when a new eruption will occur, but it could happen quickly any time. It would probably begin with a series of stronger earthquakes to open up a conduit. Based on the inflation and earthquake patterns, the most likely area would be near the 2011 vent near La Restinga, perhaps even on land. In this case, La Restinga would be the village most at risk.
The previously detected very high Radon gas emission values also suggest the presence of new magma and poses a health risk particularly in closed low-lying rooms of buildings especially in southern El Hierro.

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Di, 24. Dez 2013, 08:50
The new seismic / deformation crisis continued over night with about 20 quakes between magnitudes 2-3 today so far (during the first 6 hours). The key obsservations are: ... Read all
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