Strong earthquake swarm in south Iceland yesterday (20-October-2017) – minor damage reported

Yesterday (20-October-2017) a strong earthquake swarm happened in south Iceland on the SISZ fault zone. This earthquake swarm is currently ongoing and stronger earthquakes cannot be ruled out at this point.


The earthquake swarm as of the writing of this article. Copyright of this image belongs to Icelandic Met Office.

Largest earthquake that has happened so far had the magnitude of 4,1 and four magnitude 2,9 earthquakes have happened at the writing of this article. During the strongest earthquake yesterday some minor damage has been reported, items falling out of shelves and breaking, picture frames getting skewed on walls. For a short time the village of Stokkseyri lost all line phone communication, I don’t know how long that outage lasted but phone service was restored quickly according to the news on Rúv. Largest earthquake was felt over a wide area, all the way to Reykjavík and up to Akranes village and east to Hella village.


The magnitude 4,1 earthquake as it appeared on my geophone in Dellukot. This image is under Creative Commons Licence, please see CC Licence page for more details.


The magnitude 4,1 earthquake as it appeared on my geophone in Böðvarshólar. This image is under Creative Commons Licence, please see CC Licence page for more details.

I don’t know if this earthquake activity signals a new period of earthquake swarm in SISZ. I have listed large history of earthquakes of the SISZ in a article from 2011 here.

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8 Responses to Strong earthquake swarm in south Iceland yesterday (20-October-2017) – minor damage reported

  1. Luisport says:

    Report says the above mentioned that this can possiby result in large quakes in the coming days. Also says that 10 >M3.0 quakes can be expected after the one that occurred yesterday evening. Until now only 5 have taken place so we can expect more of these small ones.
    http://www.mbl.is/frettir/innlent/2017/10/21/ekki_haegt_ad_utiloka_staerri_skjalfta/

  2. Jack McIlveen says:

    I suppose that all the comments about Iceland being quiet will stop now!!

  3. Elmar says:

    Any ideas about Reykjanes and Nylenda, tremor plos?
    http://hraun.vedur.is/ja/oroi/nyl.gif

    • This is just ocean wave noise hitting the beach. There is a large low pressure system on the way to Iceland and such weather system start to appear on SIL stations days before they go over Iceland.

  4. Luisport says:

    Tuesday
    24.10.2017 14:18:32 64.520 -17.410 4.4 km 4.0 50.5 14.4 km NNW of Grímsfjall

  5. Jack McIlveen says:

    followed by
    Tuesday 24.10.2017 02:54:36 PM 64.621 -17.43 1.4 km 3.4
    99 5.1 km ESE of Bárðarbunga

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