Update on the eruption in El Hierro volcano on 9 November, 2011

Short note on comments: This is a short notice on comments. This blog has been getting a spam flood for the past few days. During the past 2 days or so there have been over 300+ spam comments that my spam filter has captured. This makes it ever so hard to find real comments that go into the spam box by accident. If your comment disappears for no reason after it has been posted. Then the spam filter has captured it. Please do not re-post it, as then following comments are just going to go into the spam box too. I have to manually un-check them as spam and approve them. So if you post three comments with the same link, I am going to clear the three comments with the same link. But given the amount of spam that this blog is getting there is always a risk that comment is going to get lost and permanently deleted.

It is also important that if you get “comment is held for moderation” that you do not re-post what you are commenting on. As the comment is going to wait in the moderation until I clear it. I am not always around to check for this, so it might take few hours or more until I approve the comment/s.

The eruption in El Hierro volcano is ongoing and does not appear to show any signs of ending. However the strength of the eruption has dropped a bit during the past two days. But this was to be expected, since this is a fissure eruption and it has mostly been erupting from the same vents during the past four weeks.

It has become a bit difficult to get accurate information on what is going on El Hierro Island. So I am not going to speculate on that. But from what I can gather it seems that dangerous gas level has been detected on the ground. But the reports that I am reading are bit unclear on this. This has also been mentioned in comments on this blog.

The harmonic tremor from the eruption in El Hierro volcano at 15:23 UTC on 9 November, 2011. Copyright of this picture belongs to IGN.

As can be seen on this tremor plot the harmonic tremor in the eruption is dropping. Explosions that have taken place are also clear on this tremor plot. That might be because the eruption vent is getting smaller, therefor less magma is being push out the erupting vent. Or the currently erupting vent might be closing up. As so often happens with fissure type eruptions. If that happens does not mean that this eruption cycle is over. It just means that the current eruption vent has closed up. New fissures are most likely to open up in coming weeks as the eruption goes on. Where and when it impossible to know for sure.

Earthquake activity continues in north part of El Hierro volcano. This are most likely dike intrusions into the bed rock there. So earthquake activity should be expected to continue north west of the town Frontera. If a dike intrusion manages to find a path to the surface in this area there is going to be a eruption and earthquake activity should drop following that. But until and if that happens there are going to be earthquakes. There is also chance of hydrothermal activity to show up in this area if a dike intrusion gets shallow into the bed rock. But is not go up from the ground and start a eruption. This might also be the reason why some part of El Hierro Island are experiencing high levels of toxic gas for the moment.

I am going to post more on the eruption in El Hierro volcano as I know more what is going on.

418 Replies to “Update on the eruption in El Hierro volcano on 9 November, 2011”

    1. Katla will comment it too!

      A star maybe!
      11.11.2011 15:01:31 63.646 -19.129 1.1 km 3.1 85.16 6.0 km E of Goðabunga
      11.11.2011 14:57:25 63.636 -19.163 1.1 km 2.6 90.07 4.3 km E of

    2. It is worrying that they appear to have taken so long. Because, as you say Jon, the data has been [readily] available.

    1. WOW! Brilliant! Thank you to the providers. 🙂 This is greatly appreciated. Of Course, volcanoes being contrary beasts, we will probably find all the action in the North from now on!!! (I really hope not for the sake of all the islanders)

  1. OT and a reply to Geo Loco November 11, 2011 at 09:43 ….. As I grow my own vegetables I am quite happy with a Cucumber Glass. I am not one for designer stuff or fancy trimmings.
    Just for the record I keep my brain young by regular visits here. It gives it exercise thinking about volcanoes and travel rather than the state of the financial and political world.
    I have also set myself a goal to live to at least 100 , just to p…s off a certain pension provider and the Tax man as I could not claim an odd pension of £146 per annum as a lump sum… so I have ticked the box to have the pittance divided in 12 monthly smaller pittances. Even though I am maths phobic I worked out they would spend far more on administration costs if I live for at least another 10 years :).
    My final ploy to keep the Grim Reaper at bay has been to marry a man 20 years my junior. This has worked very well and we have just celebrated 18 wonderful years together 🙂 I recommend it 🙂
    Age is in the mind!

    1. I’m also math-phobic. But i take the maths-teacher! So all i have to do is, every time i don’t understand the maths-stuff here,asking him! Ah, not really. I always show him the best things… 🙂

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