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 Volcanic Alert In Effect On El Hierro 
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Post Volcanic Alert In Effect On El Hierro
This is not good news at all - especially if you live on the east coast of the USA!!



Volcanic Alert In Effect On El Hierro As 4.3 Magnitude Earthquake Hits
By Mark Dunphy - Sun Oct 09, 1:59 pm


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Epicentre of Saturday night's earthquake on El Hierro. Image Google Maps


A 4.3 magnitude earthquake struck El Hierro, the smallest of The Canary Islands, late on Saturday night. It was the strongest earthquake to be recorded on the Spanish island since an unprecedented earthquake swarm commenced during the summer.

The Instituto Geografico Nacional (IGN) has reported an increase in the intensity of earthquakes recorded on El Hierro, the smallest of The Canary Islands, during the last 48 hours. The number of earthquakes recorded since July 17 , 2011 on El Hierro has now reached 10,000, figures from the IGN confirm.


The IGN also confirmed surface deformations exceeding 35mm on the 280-sqkm island, where residents have been put on alert for a possible volcanic eruption. However, seismologists have moved to reassure the local population that a volcanic eruption is not imminent.

The agency confirmed on Friday that 886 earthquakes, most of them located in the sea to the SW of the island, have been recorded in the 7 days since 02 October, 2011. During this period, 71 earthquakes were felt by the island’s estimated 10,000 residents.

Since Friday morning, there have been more than two dozen earthquakes exceeding 3.0 on the Richter Scale with epicentres both North and South of the NW Ridge and depths between 10 and 15 km have been recorded. The strongest of the tremors measured 4.3 magnitude on the Richter Scale, many times stronger than other earthquakes recorded on the island since mid-July. It was recorded on Saturday night at a depth of 12 km. The quake produced small rockslides but no injuries were reported.

Hierro, a shield volcano, has had a single historic eruption from the Volcan de Lomo Negro vent in 1793. The eruption lasted approximately one month and produced lava flows.

The recent surge in the number and intensity of earthquakes prompted officials from the IGN and The Canary Islands Government to raise the alert level for the Hierro volcano to ‘Yellow’ late last month. The alert remained in place on Sunday.

Seismologists say the majority of the earthquake activity has shifted from El Golfo in the island’s northwest to beneath the Las Calmas Sea in the south.

However, magma is now on the move upwards while the depth of earthquakes has become increasingly shallow in recent days with most being recorded at a depth of 9 to 14 kilometres. Movement of magma towards the surface signifies that a volcanic eruption is likely to happen, but the timing of such remains unclear.

Volcanologist Juan Carlos Carracedo last week suggested that an eruption on El Hierro would “not be a major surprise”. He explained: “It is the youngest of the Canary Islands. There is a ball of magma which is rising to the surface and it is stationed at the limit of the earth’s crust. At the moment we do not know if that ball of magna will break the crust and cause an eruption.”

IGN Director, María José Blanco said that any eruption on El Hierro would most likely have a “low explosion value”.

Snip


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:?:

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Tue Oct 11, 2011 3:16 pm
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Post Re: Volcanic Alert In Effect On El Hierro
Here is Dutch's take as of Oct 10th 2011


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Tue Oct 11, 2011 7:09 pm
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Post Re: Volcanic Alert In Effect On El Hierro
:awe Been watching the Canary Islands for some time now.... I don't like how this sounds.

edited to add: I live on the East Coast of the USA.

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Wed Oct 12, 2011 6:21 am
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Post Re: Volcanic Alert In Effect On El Hierro
Subsea Volcanic Eruption Underway Near El Hierro (The Canary Islands)

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http://www.irishweatheronline.com/news/ ... 41266.html

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Thu Oct 13, 2011 7:25 am
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Post Re: Volcanic Alert In Effect On El Hierro
Canary Islands residents evacuated amid fears of seabed volcano eruption

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The regional government of the Canary Islands has begun evacuating the small town of La Restinga, on the island of El Hierro, and raised its earthquake warning level amid evidence that a volcano is erupting deep on the nearby seabed.

Approximately 600 inhabitants of the fishing port on the island's south coast were being told to congregate at a local sports field for evacuation on Tuesday.

Scientists have reported that a volcanic eruption is taking place about 5km (3.1 miles) off the coast at a depth of 600 (1,960ft) to 1,000 metres.

The only visible evidence of the eruption is reported to be dead fish that have floated to the surface. The fish had probably been killed by gas escaping from the volcano, scientists said.


Full Story >>>
http://www.guardian.co.uk/world/2011/oc ... sfeed=true

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