Minor earthquake swarm east of Grímsey Island

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Today there has been a minor earthquake swarm east of Grímsey Island (is in Tjörnes Fracture Zone). The number of earthquakes that have taken place at the moment is something around 20 to 30 earthquakes. All of the earthquakes so far are less then ML3.0 in size.

This earthquake swarm in TFZ is so far quiet and mostly small in size. It remains unclear as always if this earthquake swarm changes or starts a new earthquake swarm that is bigger. But this area is known for that one earthquake swarm starts a new one in the TFZ.

So far this does not appear to be happening in the TFZ. But it is worth mentioning that TFZ is highly active earthquake zone. But there are no volcanoes there. Except at the south and north end of the TFZ. Where the rift zone ends and where the rift zone starts again.

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39 Responses to Minor earthquake swarm east of Grímsey Island

  1. motsfo says:

    Thanks for the update….
    and as a side note; here is a map showing the major volcanoes in Iceland.
    How many are in the right place?
    http://vulcan.wr.usgs.gov/Volcanoes/Iceland/Maps/map_iceland_volcanoes.html

    Best!motsfo

    • They are missing the other major volcanoes in Iceland. Mostly Hofsjökull volcano and the other volcanoes that have not been so active in the human times.

      • motsfo says:

        i think the placement is off too.
        ;)
        Good thing we aren’t using this map to get around Iceland.
        Best!motsfo

  2. Renato Rio says:

    I don’t expect much from the quakes in the TFZ.
    Besides being so frequent, they don’t indicate any eruptions. That’s the routine of the MAR.
    But I’m curious about how Bradarbunga and Kistufell will evolve…

    • On the contrary, there are some active volcanos there complete with underwater calderas. But… These seem not to be affected by all the quake-swarming there.
      If you look at the “Tjörnes Fracture Zone – Small” at MET you will see to dotted areas out in the ocean, those are active volcanic fields that has erupted after icelandic colonization.

  3. Irpsit says:

    Motsfo, that is a very incomplete map of Icelandic volcanoes.

    This is a much better one (Google Earth)
    http://feww.files.wordpress.com/2010/04/volcano-map-of-iceland.jpg

    However, it only shows the central volcanoes. There has been lots of large volcanic fissure eruptions between Katla and Grimsvotn, and Torfajokull and Bardarbunga. There are volcanic moutains (active within the past 5000 years) north and east of Hengill, and also on both sides of Langjokull. If you travel to these regions, you can check those volcanic summits on detailed maps. I am also not sure whether Herdubreid and Snaefells are still active volcanoes of their own.

    I am surious to see what happens at Kistufell. It has been 100 years since last Bardarbunga eruption, no?

    • Pieter says:

      Not if you count Gjàlp, this was a fissure between B and G in 1996. And the 1902 eruption was from the Loki system, which is part of Bardarbunga I believe.

  4. Daniel_swe says:

    I cant help to think about this…It seems that all active volcanoes under and close to Vatnajökull (most of them connected to Bardarbunga) is acting up.

    Bardarbunga, Grimsfjall, Hamarinn, Askja…They all show seismicity at a fairly respectable depth. Is it the plume that is making a fuss? I mean they are above a hotspot..

    • Lurking says:

      The more I read, the more I see stated that Iceland’s may not be a deep mantle plume, but more of a shallow (relatively speaking) entity. This idea comes from the chemistry and the little issue of Iceland’s plume not tracking the same as other plumes when they do the plate reconstruction. Many of them are in agreement on positioning when they work the plate rotations and movement out… yet Iceland’s doesn’t quite fit.

      Add to that the idea that the crust is rather thick for an island over top of a spreading center.. which generally thins the crust (spreading does that), and the evidence for it being continental crust over laying oceanic crust… like a pancake, sort of seems to have merit. That would tend to support the idea that the MAR interacting with the extra load might contribute to the energy of the hotspot.

      • Fireman says:

        ‘The plume’ may be a mistake. It’s not proven or universally accepted, and if it exists, the structure may be a lot more complex than ‘the plume’ may lead one to believe.

  5. There is a bad storm about to hit Iceland. Wind speed is expected to top at 22:00 UTC. With wind speeds of 30m/s and peaks even higher.

  6. Treacleminer says:

    Also, do they always do this? Have they always done so?

    • Treacleminer says:

      Ooops! that was supposed to be a reply to Daniel_swe

      To Jón Frímann , Oh, that will be why it seems quiet – because the earthquakes are drowned out by the storm.

      • Yes, that is why it is quiet. But the wind speed has been going up to 35m/s in Iceland according to the news.

        • Lurking says:

          You know… it wouldn’t take much to convince some of our US congressmen the high winds might topple Iceland over. We already have one that thinks that stationing too many people on Guam will cause it to capsize. (Hank Johnson)

  7. Jose Luis says:

    Tremors of Hekla be a mistake I guess
    ???
    http://www.simnet.is/jonfr500/earthquake/tremoris.htm

    • Daniel_Swe says:

      Hehe now that is windy noise! :) Either that or someone decided to use the helicorder as a football.

      But as Jon said, windspeeds at 35m/s so it might very well be just that.

  8. David L says:

    Dagur Bragason said: February 8, 2011 at 01:37, on the ‘Geologist worry about earthquake activity in Kistufell field’ post
    >>
    Here is another tool : http://www.natturuvefsja.is/vefsja/

    You can select active layers and under jarfræði(geolgy) you can select jarðhitasvæði(hot springs), sprungur(cracks), gígar(craters) an some other geological features.
    <<
    Many thanks for that and, if it helps anyone an Icelandic friend of mine (non-technical) has provided these translations.

    http://qvsdata.wordpress.com/learning-links/1084-2/

    Please feel free to add any corrections in the comments

  9. Stefan says:

    A new single Quake near Hekla:

    09.02.2011 13:38:55 63.933 -19.937 8.5 km 0.9 90.01 14.7 km WSW of Hekla

  10. I have updated the link bar at the top of the blog. I have moved to support and donation into drop down menu.

  11. Hekla seems to have gone back to sleep.
    I haven’t recorded a transient-event for more than 48 hours. The current activity is all at the Hella-strainmeter and that is more likely caused by Hengill then anything else.

    But, I still say that Hekla is prone to erupt anytime, remember that it met the requirements of MET for erupting more than 5 years ago.
    As such Hekla is in a way the biggest mistake from MET in some 40 years. All the other predictions have been really well met by real eruptions. But the MET prognosis in 2005 that Hekla would erupt in 1-3 years was obviously wrong, even though it was based on very good logics and facts. Instead Hekla has just gone on and on with inflation, straining and deformation that is now way beyond any figures measured for the two last eruptions. Remember that it passed the inflation-points of both 2000-eruption and the one before already in 2005 and the inflation rate has since then been hard and very fast. The same goes for deformation of the mountain towards Burfell/Isakot.

  12. A new blog post is up! :)

  13. Irpsit says:

    There was a hell of a storm here yesterday, near Selfoss.
    Winds have topped 115km/h with a maximum gust 147km/h. Amazing!
    Almost hurricane 1 winds. We even had damage in some windows of our home.

    But we still a part of the 50cm of snow that fell on the blizzard of last weekend.
    A new storm comes Friday.

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