39 comments on “Activity increases at Semisopochnoi

  1. multiple parasitic cones currently building in the caldera. These include Sugarloaf, Anvil and Cerebus

    Not Cerebus The Aardvark, surely? 🙂 Great post as always; this is yet another of those basaltic shields which has ‘gone caldera’ with a massive silicic eruption in the Holocene (Okmok, Ambrym, etc)

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    • Wish I knew. I don’t read these things very well other than look at the frequency and amplitude of the smaller quakes. It reminds me a lot of what the webicorders looked like during the leadup to Redoubt. Not saying that anything like that is underway. But the smaller quakes started coming early and often along with other stuff I didn’t understand at the time. Cheers –

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  2. Hi agimarc, thanks for the heads up! That’s one of those I have never heard of before!

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  3. To the NtV riddlers – are the remaining ones too tough to find out, do you want me to add hints? Come on now, you should at least make out #034 without a hint:

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  4. Hurricane “Niklas” is raging outside and I am sitting in my loft apartement, waiting for the roof to take off… :/ All afternoon messages have come in of fallen trees, collapsed walls, flying roofs etc., some people died. In many areas train traffic has been stopped completely for danger of trees on the rails, and some large buildings, as for exemple Munich Main Railway Station, have been evacuated and closed until winds would calm down – something unheard of before.

    To me the most impressive picture was this one: a train had hit a tree fallen onto the rails – luckily, nobody was killed in this accident:

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    • Stay safe! Night storms are scary! Hope your night passes without incident and you can get some rest as it dies down! Check in tmrw so we know u r OK!

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      • Thank you maggiemom and dfm! Me and my family have suffered no damage, just my potted tree on the balcony which I had tied securely to the iron railings – or so I thought – was torn loose and lost a few branches. The house I live in was built in 1910. I always think firstly that they built sturdier at that time, and secondly, if it had withstood all storms for 105 years there is no reason that this should change just now. 😀

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        • So true! Don’t build them like they used to! Glad all is well and your town can recover soon.
          Gosh,the train does look like it devoured that tree. . .

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  5. Hi

    Bardarbunga is nearly quiet these days so it’s time to make a retrospective.

    I did not supply plots for some time, so I try to amend and change that a bit.

    Here is the first of a new series. Unfortunately I lost some of my data (the file was corrupted) and this plot uses data from august to end of december 2014. The good news is that I can rebuilt the data file but it will take some time.

    I tried a new approach, filtering by magnitude range (ie 0-2, 3-4 and 4-6, instead of simply > or > to…) and showing only a maximum number of quakes (here 750) so that the time window of the display varies (see title bar for mag adn time span)

    So this is an hour by hour earthquake plot for bardarbunga area.

    Earthquake magnitude is selected from 0 to Mag 2.

    Only 750 events are shown at all time to avoid overcrowding.

    Dot color is date dependant (see left colorbar). Blue is older and red is younger.

    There is also some terrain altitude information (see right side of colorbar)

    First view is from the east, then from the top and finally all events are shown with rotation and some tilt.

    There seems to have been some dyke like activity under Herdubreid (see at 0:17 to 1:00 and 3:44-4:15, the aligment is remarquable).

    On the top view the dyke progression is well seen including it’s change of direction @ 3:37)

    Data from IMO (>99% quality) , NOAA, Made on Gnu Octave for Volcanohotspot.wordpress.com

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  6. Here is another plot.
    Earthquake magnitude is selected from 2 to Mag 3.
    Only 500 events are shown at all time to avoid overcrowding.
    Dot color is date dependant (see left colorbar)
    First view is from the east, then from the top and finally all events are shown with rotation and some tilt.
    There seems to be some dyke like activity under Herdubreid (see at 0:17 to 1:00 and 3:44-4:15, the aligment is remarquable)

    You can also “see” the building of the fissure eruption chamber (twin chambers it seems) from 20 s (not an expert). Then from 1:00 and onward the activity goes back nearly solely under the Caldera.

    On the top view there may have been another intrusion between the caldera and the dyke’s progression around 1:40.
    @2:15 have a look at the linear structure near Heirdubreid on the upper right fo the plot.
    After 3:40 the images of the previous plot appear (my bad).

    Data from IMO, NOAA, Made on Gnu Octave for Volcanohotspot.wordpress.com

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  7. And the last one – Mag 4-6

    Interestingly the first part of the dyke intrusion does not show with these magnitudes. Look @0:50

    An hour by hour earthquake plot for bardarbunga area.
    Earthquake magnitude is selected from 3 to Mag 6.

    Only 250 events are shown at all time to avoid overcrowding.

    Dot color is date dependant (see left colorbar)

    First view is from the east, then from the top and finally all events are shown with rotation and some tilt.

    Interestingly the first part of the dyke intrusion does not show with these magnitude. Look @0:50

    After 1:50 the plot is not relevant (old pictures)

    Data from IMO, NOAA, Made on Gnu Octave for Volcanohotspot.wordpress.com

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    • Spectacular work, dfm. Many thanks. Amazed with all the activity under Bardarbunga and never a peep of an eruption. Fascinating that the dike appears to have extended to Herdubreid without it participating. Perhaps sometime soon…. Cheers –

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      • Thanks Agimarc

        Partly from the listi directory
        Otherwise from the IMO page (cut and paste, yeah I know, it’s not optimized….)

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    • Thanks dfm, that must be a labour of love, and a revealing experience for the trained eye. Special thanks for your explanations and conclusions, as for the not so trained eye (as mine) it is difficult to make sense of the dancing dots. With the help of some hints, I look more focussed on events and even replay them until I see what you see, and then I go on with own thoughts or conclusions.

      As to Herdubreid, it would be interesting to see what the rest of the MAR towards north is doing at the same time. There must be many similar spots where the magma is coming up in dike like intrusions, as the MAR itself is a constantly active line shaped feature. I expect that at every weaker spot magma comes up, but how far up depends on the conditions of the overlying rocks.

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      • Well to be totally honest, the way the data is displayed can sometimes be misleading. In that case I keep a “window” of 250 to 750 quakes after the first events there is always the same number of events (but the date span changes). If you look at the title bar, you’ll see that the “time window” gets larger as we move forward in time.
        in my opinion, the more interesting video is the mag 2 to 3 one. maybe I’ll try to display successively the different magnitude “slices” for a different view. Everyone suggestions or comment are of course welcome.

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  8. The lunar eclipse was visible here in ANC last night. Beautiful clear night. Stunning full moon that went very dark. Started around 2 AM. Totality around 3:30. Ended around 5 AM. Haven’t seen one of these in a long time. Very nice. Cheers –

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  9. Just want to let webcam watching people know that I have finished and uploaded an Alaska page to my webcam collection. This should be almost the completion of it, I don’t want to let it get much bigger in regard of pages. It will now only be add and/or remove, so it doesn’t take all day to go through them.

    http://volcams.malinpebbles.com/pubweb/Alaska.htm

    (If your browser doesn’t show the new page, press Ctrl+F5 to refresh avoiding loading of the cached “overdue.html”)

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  10. We should keep an eye on Guagua Pichincha, Ecuador. Half of Quito living at its flanks and the other half meandering onto its two peaks at the weekends would make for a fine spectacle if G.P. decided to throw a few cartloads of ash on them. Hopefully not the way it happened with Ontakesan!
    The latest IGEPN report (02 Apr 2015) has it that,
    “The guardian of Refuge of Guagua Pichincha, Rodrigo Viracucha, reported that due to bad weather in the volcano area, he has failed to make observations. But on Tuesday, he observed that the vents were slightly active, and these days the smell of sulfur was higher than normal, being perceptible from the refuge.” and that “On 31/03/2015, 58 events between VT and LP were recorded, most of these events are long period events. The total of localized events from 01/01/2015 to 01/31/2015, is 106 events. Some of these events were located inside the crater, the other near the crater at depths between 4 and 9 km”. So… watch out!


    Photo: IGEPN

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  11. Tungurahua, Ecuador, last webcam image for today before switch off…. abt. two hours ago

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