General Volcanic Activity Thread!

[tinybill]

The harmonic tremor has built up again rapidly overnight, so it looks like there is magma flowing freely somewhere again.

http://www.ign.es/ig...1&Dia=03&tipo=1

EL. HIERRO grand cannry islands

i been reading a spanish page just a moment ago they been telling people to keep calm!!

[NorthNorfolkWeather]

Amazing pic of Cordon del Caulle in Chile

http://imgur.com/R6c4a

That is one heck of a photo

[karyo]

Amazing pic of Cordon del Caulle in Chile

http://imgur.com/R6c4a

Is this a new photo?

The eruption is ongoing but at a lower rate so I didn't expect to see volcanic lightning!

Karyo

[BornFromTheVoid]

Had a look for the source, turns out it was taken in June but only published on Nat Geo 3 days ago.

[The PIT]

It's likely that Rhyolite is a by product of crystallisation and isn't available in large quantities. Rather some of it has mixed with the present Basalt. So I would say a explosive eruption is unlikely.

[tinybill]

el hierro this tanslated from a spainsh web page

The Iron

Scientists predict a rash of major entity in El Hierro

Scientists at the Institute of the Canary Islands volcanological believe that volcanic anomalies south and north of the island are connected | Interior alert Volcanic Risk Committee about the situation in the island

Life | 03/11/2011 - 15:25 pm

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MORE INFORMATION

• El Hierro, chronology of an erupting volcano
• The Iron recorded in the early hours of Thursday a total of 19 earthquakes
• An earthquake measuring 4 degrees shakes El Hierro and it is possible another eruption

With the passing of the hours, it seems that seismic activityon the island of The Iron returns to experience boom. In this regard, the Directorate General of Civil Defense and Emergencies of the Ministry of Interior has warned the State Committee for Coordination of Volcanic Risk, which follows the evolution of the seismic situation in the island.

It appears that a new eruption could be a matter of a short amount of time. Without going any further, a little over 24 hours for two earthquakesof a considerable magnitude (4.4 and 4.3 on the Richter scale) have shaken the place. The activity is now concentrated in the north of the island, Unlike lat first eruption was the south of El Hierro as the main protagonist.

According to scientists, a significant amount of magma would be looking for a solution to the surface. "We believe what is happening in northern intrusion of magma, an episode similar to what happened in La Restinga, but with much larger magnitudes" explained LaVanguardia.com responsible for scientific dissemination volcanological Institute of the Canaries (non-tip), David Calvo.

"By releasing energy that we are seeing could be a rash of more entity. We are seeing a large supply of energy and that can translate into an episode of greater strength. This, however, does not necessarily imply that more explosive . But more entity, simply, "he adds.

Interestingly, both situations (which is now living in northern The Iron and lived longer, and still continues in La Restinga) Could be connected. "The two earthquakes on Wednesday that they have done is to change the pressure conditions within the system, and that today has come back bubbling in La Restinga and the tremor has become to be felt in this area. Most likely, both the north and the anomaly in the south have some sort of deep connection. The building would be doing screen island between the two, "says Calvo.

Although the volcanic activity of the island seems to be more significantly, the locals remain calm. "The situation in the north is pretty well controlled now. In terms of safety and emergency, are becoming things pretty well. There is no precipitation, is being consulted much, much information is being given to the people ... But we must be vigilant, of course, "Calvo sentence.

From the Ministry of the Interior is any incident if required by the adoption of extraordinary measures on the Island The IronHave reported the same sources.

[BornFromTheVoid]

It's likely that Rhyolite is a by product of crystallisation and isn't available in large quantities. Rather some of it has mixed with the present Basalt. So I would say a explosive eruption is unlikely.

That's the most likely scenario.

Does anyone know if the Canary Islands are located off the African continental shelf? Continental plate melt would tend to give more felsic magma types.

[Crepuscular Ray]

According to the USGS, they're on the continental shelf.

[BornFromTheVoid]

According to the USGS, they're on the continental shelf.

I'm a little busy at the moment (actually typing up an essay on the neotectonics of central Greece!), but I had a quick look and found a page that says they're all located on oceanic crust here, and another that says just off the continental shelf here

Neither as authoritive as the USGS though...

Not sure what to believe now!

[Crepuscular Ray]

Nor me - if you look at the US National Geophysical Data Center, it looks like the Canaries are beyond the continental shelf, but the USGS disagrees. We'll presumably find out in the months to come when we see what for any eruption takes.

The neotectonics of central Greece - how on Earth (if you see what I mean) do you ever decide when to impose a cutoff date for the data?

[BornFromTheVoid]

Nor me - if you look at the US National Geophysical Data Center, it looks like the Canaries are beyond the continental shelf, but the USGS disagrees. We'll presumably find out in the months to come when we see what for any eruption takes.

The neotectonics of central Greece - how on Earth (if you see what I mean) do you ever decide when to impose a cutoff date for the data?

The data we're using is based on the sites we visited there in the last week of September. I have a thread in the photography section with a few images and links to more stuff. We have to know the general background as to how the plates ended up in there current position, but most of what we were working on were relatively recent tectonic processes and their influence on current day sedimentation around the Gulf of Corinth.

Here's the latest image

http://earthquake-re...ased-to-yellow/

[The PIT]

Yup El Hierro going nicely http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

[BornFromTheVoid]

Evacuations in La Restinga on El Hierro.

http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

[The PIT]

Now will it make it to the surface ????

[Red Raven]

Now will it make it to the surface ????

It does look like we could see a new (albeit small) island in the morning.

[Moomin]

According to the USGS, they're on the continental shelf.

Its a while since I did volcanology at uni but I was always under the impression that the canaries were classic sea mounts and therefore are positioned on the oceanic crust. The magma is definately 'Basic' as evidenced by the Basaltic lava floes.

Moomin

[BornFromTheVoid]

[summer blizzard]

And a new volcano is born, very good.

Do people think that that it is just an effective new vent in the El Hierro volcanic system or do people think that this has its own magma chamber.

Also, the fact that it is spewing out more explosive magma should be interesting especially since it climbed 700 meters in a month.

[The PIT]

It hasn't broken the surface yet and in the last few hours the bubbling as stopped. Hopefully just a rest though.

[cyclonic happiness]

A couple of questions....

1. if/when the volcanic vent breaks the surface and is clear of the water so non can get into the vent, will the volcano then shoot a big ash cloud a few miles into the sky?

2. If this happens, looking at the latest charts, it seems to indicate that any ash from El Hierro would come in this general direction via France.

Do you think there'll be enough of an ash cloud to affect flights in southwest Europe?

[Crepuscular Ray]

1. Probably.

2. Depends on the wind direction. If winds are from the south, south-east, south-west or any parts between, Mr O'Leary might be a very unhappy bunny.

[BornFromTheVoid]

Thermal image of a sea "jacuzzi" off El Hierro taken from here

[cyclonic happiness]

Another volcano is now erupting!

This time, in the Congo.

Really has been a stupidly busy year hasn't it?

Nyamuragira volcano erupting

http://www.volcanolive.com/nyamuragira.html

[summer blizzard]

I'm pretty sure that volcano erupts all the time.

[cyclonic happiness]

I'm pretty sure that volcano erupts all the time.

Yeah, they said it erupts every three years or so, jusy amazing that there is so much activity, both volcanic and seismic.