General Volcanic Activity Thread!

[Tom Jarvis]

big quake m4.0 at a v shallow depth of 0.6km wonder if that has set anything off

[Sainsbo]

All of the larger quakes (~M3.5+) seem to be occuring in a different area to the rest.. Does anyone know why this may be the case?

 

[Buckster]

Mag 5.3 quake detected but not sure if confirmed yet

!!!

[Buriedundersnow]

Gisli Olafsson â€@gislio 11m

According to @LastQuake there was an 5.3M quake 2.3km from #Bardarbunga few minutes ago - things continue to evolve #ashtag

Earthquakes Tsunamis â€@NewEarthquake 7m

5.3 earthquake, 113km WNW of Hofn, Iceland. Aug 24 00:09 at epicenter (21m ago, depth 5.4km). http://j.mp/1AISA5D

 

Gisli Olafsson â€@gislio 9m

Wonder why 5.3M quake shows as 3.0 on IMO? Their sensors are tuned for small quakes and hence underestimate big quakes #Bardarbunga

Edited August 24, 2014 by Buriedundersnow

[karyo]

Nice to see the M5.3 on the chart!

 

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/

 

Karyo

[NorthNorfolkWeather]

Confirmed 5.3 , also a 5.1 just before 6 AM All the big quakes are in the same area. Would think there's something big going on there

[tinybill]

Confirmed 5.3 , also a 5.1 just before 6 AM All the big quakes are in the same area. Would think there's something big going on there

just looked  on the cams cant see any thing

[picog]

All of the larger quakes (~M3.5+) seem to be occuring in a different area to the rest.. Does anyone know why this may be the case?

 

Love the representation of the quakes, makes it very easy to visualise where all the activity is.

[doctormog]

If I'm reading things correctly there seems to have been an increase in harmonic tremor this morning too. Magma is still moving...

[lorenzo]

Nice graphic here from Dave McGarvie @subglacial translates the quake activity into what you can see across cams.

 

Red line is fissure currently covered by ice, yellow is flood paths.

 

Lots of quakes at Kistufelli at various depths with the couple of biggies at Bárðarbunga also plotted on the bar graph at 5.1 and 5.3

 

Quakes at 4.5 to 5.5 predictive of eruption to it's another day of keeping close attention..

 

 

 

 

 

 

 

[lorenzo]

24th August 2014 06:48 - from geoscientist on duty

Two M5 earthquakes took place in Bárðarbunga caldera during the night:

A magnitude 5.3 earthquake occurred at 5 km depth just after midnight, at 00:09. Its origin was at the northern rim of the caldera. Another earthquake, magnitude about 5, occurred at 05:33 and originated at the southern rim. These are the strongest events measured since the onset of the seismic crisis at Bárðarbunga and the strongest since 1996 (the Gjálp eruption). The magnitude is already confirmed by the European EMSC network and the GEOFON network of GFZ Potsdam in Germany.

Probably, earthquakes near the Bárðarbunga caldera are a consequence of adjustment to changes in pressure because of the flow of magma from under the caldera into the dyke which stretches to Dyngjujökull, more than 25 km away.

Great seismic activity is also near the intrusive dyke in Dyngjujökull. The activity is concentrated at the section which advanced northwards yesterday morning. Analysis shows that the origin of the quakes, there, has migrated a little towards north. Their depth is mainly in the range of 8-13 km. The largest earthquake in the Dyngjujökull area was 3.5 at 04:39.

No signs of tremor, indicative of eruption, were detected during the night.

[Buckster]

Loads of mag 3 quakes this morning

[Buriedundersnow]

24th August 2014 06:48 - from geoscientist on duty

Two M5 earthquakes took place in Bárðarbunga caldera during the night:

A magnitude 5.3 earthquake occurred at 5 km depth just after midnight, at 00:09. Its origin was at the northern rim of the caldera. Another earthquake, magnitude about 5, occurred at 05:33 and originated at the southern rim. These are the strongest events measured since the onset of the seismic crisis at Bárðarbunga and the strongest since 1996 (the Gjálp eruption). The magnitude is already confirmed by the European EMSC network and the GEOFON network of GFZ Potsdam in Germany.

Probably, earthquakes near the Bárðarbunga caldera are a consequence of adjustment to changes in pressure because of the flow of magma from under the caldera into the dyke which stretches to Dyngjujökull, more than 25 km away.

Great seismic activity is also near the intrusive dyke in Dyngjujökull. The activity is concentrated at the section which advanced northwards yesterday morning. Analysis shows that the origin of the quakes, there, has migrated a little towards north. Their depth is mainly in the range of 8-13 km. The largest earthquake in the Dyngjujökull area was 3.5 at 04:39.

No signs of tremor, indicative of eruption, were detected during the night.

 

 

 

the tremors migrating to the north is something I have been keeping an eye on for the last couple of days and I am wondering how far north these might travel and if we are working towards a fissure eruption of some sort just how long the fissure could be in the end is what I'm wondering.

 

remember earlier in the year we had the swarm right beside ASKJA and this swarm looks to be moving along a line in that direction and I am wondering if the two might be connected in some way although I am not entirely sure we could get a fissure that long splitting open or if there would even be some connection in the first place its just really interesting we are seeing tremors moving towards that area.

Edited August 24, 2014 by Buriedundersnow

[lorenzo]

Another live cam up 

 

http://www.livefromiceland.is/webcams/bardarbunga-2/

 

And some more theory on what exactly is the magma doing..

http://www.discover-geography.co.uk/news/unrest-in-iceland-bardarbunga-volcanic-system-moves

[Sainsbo]

Iceland Met have lowered the risk level from red back down to orange. Seems strange to me considering that the earthquakes seem to be getting larger. It doesn't mean it's not still a threat, just that no eruption is expected imminently.

 

http://news.sky.com/story/1323940/iceland-bardarbunga-risk-level-lowered

Edited August 24, 2014 by Sainsbo

[karyo]

So many earthquakes above M3! Definitely more activity than yesterday!

 

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/

 

Karyo

[laserguy]

Iceland Met have lowered the risk level from red back down to orange.

 

Looks like a dud to me.  Ah well, there's always Yellowstone....

[swebby]

Looks like a dud to me.  Ah well, there's always Yellowstone....

May I ask why you think it's a dud?  If it's just a personal opinion or gut feeling, that's perfectly fine by me, it would just be helpful if you could have expanded on why you think so.

[Buriedundersnow]

Looks like a dud to me.  Ah well, there's always Yellowstone....

It isn't a dud if it's a fissure eruption it can take a while for the ground to destabilise properly before it even opens up never mind the ice it's fighting against aswell.We could have another two weeks or more of this before we see anything worth while happens.

[john pike]

http://www.mbl.is/frettir/innlent/2014/08/24/aviation_colour_code_from_red_to_orange/

The alert level will bounce up and down as more info comes in

I expect red level to pop up again only if we see an eruption

I personally see no change in the threat from an eruption and wouldnt be surprised

To see quakes bigger than last night

[Buzz]

Looks like a dud to me.  Ah well, there's always Yellowstone....

 

You really need to read this page, specifically the post at 11:50 today:

 

http://en.vedur.is/earthquakes-and-volcanism/articles/nr/2947

[Sainsbo]

Another big one, Magnitude 5.0.

 

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

[john pike]

http://hraun.vedur.is/ja/oroi/dyn.gif

So no slowdown on this either

[swebby]

http://www.mbl.is/frettir/innlent/2014/08/24/aviation_colour_code_from_red_to_orange/The alert level will bounce up and down as more info comes inI expect red level to pop up again only if we see an eruptionI personally see no change in the threat from an eruption and wouldnt be surprisedTo see quakes bigger than last night

 

Hi JP / Mods

Would it be worth starting a dedicated thread for Bárðarbunga and transferring all the recent posts into it along with an initial post for all the web cam/links that people have been posting?  If it does blow I can see the general volcanic activity thread getting buried with posts.

 

Cheers

S

[john pike]

Hi swebby

The thread now is so long now a new volcano thread being started is a good idea and link this one to it if previous info is needed

Need a mod to do it though