General Volcanic Activity Thread!

[coldfingers]

And now a 2.0 tremor in an interesting area of Katla. This does appear to show on the helicorder for katla area so is more likely to be accurate i reckon.

[Paranoid]

Some of the tremors might be due to wind, there was a gale warning for the south of Iceland last i saw.

[bobbydog]

Some of the tremors might be due to wind, there was a gale warning for the south of Iceland last i saw.

a lot of the tremor charts are showing wind noise and can actually hide some smaller quakes. however the latest quakes are still there so far...

http://hraun.vedur.is/ja/oroi/allarsort.html

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/myrdalsjokull/#view=map

[summer blizzard]

Just wondering what you all think to the theory that Iceland and Ethiopia will effectively become like the Siberian Traps of the Cretacius as evidenced by the large rifts and fissures opening (a big one in Iceland at the end of the 1700's).

[bobbydog]

there seems to be a very gradual increase in harmonic tremor at godabunga

something brewing maybe...?

[summer blizzard]

Could be.

Interestingly i read that despite Kilamanjaro not erupting for 200 years, there is magma less than 400 metres beneath the surface. Given the rift developing as well, i can only see this volcano having plenty of eruptions in the much longer term.

[summer blizzard]

Just been reading around Vesuvius as well and it seems that there is a link between magma depth and eruption size. When magma in the past has been at 2.5km or less, the eruptions have been lava based. When the eruptions have come from deeper, they have been much more explosive (the Pompei eruption originated from 6-8km below) and interestingly data suggests that current lava is around 6km down indicating that the next eruption will be a major.

There has also been found a 95% corelation between large earthquakes in the Apennines and eruptions at Vesuvius within a decade.

[Will storm]

Large earthquake swarm in Katla Caldera,

http://en.vedur.is/e.../myrdalsjokull/

Edited October 5, 2011 by Will storm

[Gray-Wolf]

http://www.jonfr.com/volcano/?p=1584

Close but no Cigar???

[bobbydog]

so it was something brewing!

no eruption as yet but its got to happen soon....

[Argyllcraig]

Signature of the tremors seems rather more seismic although there are clearly some harmonic tremors in there, guess the question is did one cause the other.

Its all gone very quiet again on the SIL stations so she may be off for another snooze.

Interestingly the conductivity in Mulakvisl has increased further in the last 24 hours and has seen a rapid increase in conductivity coming out of the glacier since around the 2nd Oct.

[Argyllcraig]

Some of todays data for Katla has been released and its pretty interesting stuff

http://hraun.vedur.is/ja/Katla/myr_allt.html

Most interesting is the amount of energy being released during these earthquake swarms (normalised number of earthquakes)

From the graph you can see that there has been a steady increase in seismic activity (red line) however the blue line appears to be key as this shows the relative amount of energy being produced and if you follow the line it shows a sharp rise in energy.

Theres clearly a lot of ongoing turmoil beneath all that ice.

[bobbydog]

Some of todays data for Katla has been released and its pretty interesting stuff

http://hraun.vedur.i...a/myr_allt.html

Most interesting is the amount of energy being released during these earthquake swarms (normalised number of earthquakes)

From the graph you can see that there has been a steady increase in seismic activity (red line) however the blue line appears to be key as this shows the relative amount of energy being produced and if you follow the line it shows a sharp rise in energy.

Theres clearly a lot of ongoing turmoil beneath all that ice.

that is a lot of energy being released, however it is cumulative energy, directly related to the amount of quakes during the swarm.

still, it must considerably weaken the rock above the magma chamber, so as long as the pressure continues to build, an eruption is inevitable

[The PIT]

Just been reading around Vesuvius as well and it seems that there is a link between magma depth and eruption size. When magma in the past has been at 2.5km or less, the eruptions have been lava based. When the eruptions have come from deeper, they have been much more explosive (the Pompei eruption originated from 6-8km below) and interestingly data suggests that current lava is around 6km down indicating that the next eruption will be a major.

There has also been found a 95% corelation between large earthquakes in the Apennines and eruptions at Vesuvius within a decade.

Got the link for that as I'm interested.

Going back to Katla the depths are rather interesting aren't they.

Edited October 6, 2011 by The PIT

[summer blizzard]

Got the link for that as I'm interested.

Going back to Katla the depths are rather interesting aren't they.

http://earthquake.usgs.gov/research/modeling/papers/nostro.php

Some comparisons with Helka in there.

In regards to Kalta there is deficitely magma there near the surface although the fact that it has not blew yet could indicate pressure escaping (is it known for gas fumerols ect..).

[bobbydog]

i predict another earthquake swarm at katla in the next few hours....

watch this space....

[karyo]

i predict another earthquake swarm at katla in the next few hours....

watch this space....

Why? Is this because of a pattern?

Karyo

[bobbydog]

Why? Is this because of a pattern?

Karyo

just watching the tremor charts, especially godabunga

http://hraun.vedur.is/ja/oroi/allarsort.html

[karyo]

just watching the tremor charts, especially godabunga

http://hraun.vedur.i.../allarsort.html

Thanks. I'll have to take your word for it as I am finding them hard to read.

Karyo

[bobbydog]

Thanks. I'll have to take your word for it as I am finding them hard to read.

Karyo

just watch how they act during earthquakes, if all 3 frequencies fluctuate wildly, something is going on, sometimes weather can affect them. the spikes get gradually bigger towards the last swarm, and it seems to be happening again. see my previous posts with charts attached, you might see what i mean. obviously activity could just die off again, but its interesting to watch and try to find a pattern or signs that something is happening

[bobbydog]

well, the swarm didnt happen as i thought, instead, the tremor signature has changed.

i'm not sure what this means, if anything, but then thats how to learn these things. compare the behaviour of the charts to the actual activity, i.e. earthquakes

[The PIT]

http://earthquake.us...pers/nostro.php

Some comparisons with Helka in there.

In regards to Kalta there is deficitely magma there near the surface although the fact that it has not blew yet could indicate pressure escaping (is it known for gas fumerols ect..).

Thanks Summer seems quiet plausible doesn't it.

[coldfingers]

Etna on fire again. A huge (for Etna) explosion and now a good view as the smoke is clearing.

http://www.guide-etna.com/webcam/

http://www.radiostudio7.it/webcam.asp

Edited October 8, 2011 by coldfingers

[summer blizzard]

Etna on fire again. A huge (for Etna) explosion and now a good view as the smoke is clearing.

http://www.guide-etna.com/webcam/

http://www.radiostudio7.it/webcam.asp

Etna on fire again. A huge (for Etna) explosion and now a good view as the smoke is clearing.

http://www.guide-etna.com/webcam/

http://www.radiostudio7.it/webcam.asp

It's a shame that it doesn't have the massive VEI4/5 eruptions as with the media coverage around it, it would be spectacular.

[coldfingers]

It's a shame that it doesn't have the massive VEI4/5 eruptions as with the media coverage around it, it would be spectacular.

Sadly I think it would also be very dangerous as there are so many people living around the lower slopes.

Perhaps better to look to Katla for such a spectacular eruption, if we don't die of frustration waiting for it.