Strong earthquake swarm on Reykjanes peninsula

Currently there is a strong earthquake swarm on the Reykjanes peninsula. Largest earthquake so far was a magnitude 4,0 with second largest earthquake having magnitude of 3,8. This earthquake swarm is currently ongoing. Over 150 earthquakes have been detected so far (this number is going to get obsolete soon).


The earthquake swarm on Reykjanes peninsula at 15:10 UTC. Copyright of this image belongs to Icelandic Met Office.


The earthquake swarm is highly active at the moment. Copyright of this image belongs to Icelandic Met Office.

According to the Icelandic Met Office (news at 12:20, Rúv) this earthquake swarm is a mixture of tectonic forces and magnetic (magma) forces in the ground. It is currently too early to know if this is going to result in a eruption.

Update 1 at 00:04 – 27-July-2017

Over 300 earthquakes have happened so far on the Reykjanes peninsula. Largest earthquake so far had the magnitude of 3,8 and second largest had the magnitude of 3,3.


Earthquake activity remains heavy on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.


Earthquake activity is heavy as is shown here. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity is ongoing and strong when this is written.

This article is going to be updated as needed.

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Article updated at 00:04 UTC on 27-July-2017.

28 Replies to “Strong earthquake swarm on Reykjanes peninsula”

  1. If this is the beginning of the next eruption, it is a small surprise, even if we have seen some activity in this area lately.

    Activity is slowing down a bit now, but is still loud…

    1. It is a common feature in earthquake swarm like this that they drop in activity before it increases again. I don’t know if that happens now.

      1. I am well aware of that. Interesting to see how authorities react as this is so close to populated areas. Especially Grindavík.

  2. I do not understand. Are there any known active Calderas in this vicinity? Or maybe as you say, this is a genuine earthquake of tectonic ramifications. Iceland is an intriguing place.

  3. 250 quakes with 9 stars! I belive that when IMO review them the stars will grow…

  4. One more star:
    Wednesday
    26.07.2017 21:40:55 63.877 -22.302 7.9 km 3.6 90.01 3.1 km SSW of Fagradalsfjall

  5. Wednesday
    26.07.2017 22:15:30 63.660 -19.130 5.6 km 3.6 50.5 6.3 km ENE of Goðabunga. – but note quality; unreviewed as yet. Interesting place and depth if accurate; most stronger Katla quakes have been very shallow.

  6. Updated:
    Wednesday
    26.07.2017 22:18:13 63.663 -19.084 0.1 km 4.5 99.0 8.6 km ENE of Goðabunga

    Wednesday
    26.07.2017 22:15:30 63.660 -19.130 5.6 km 4.4 50.5 6.3 km ENE of Goðabunga

  7. I bet that IMO has a tough time prioritizing and validating earthquakes right now. How many are working the night shift right now? More than usual…

  8. Hi Jon. I just wondered if you or anyone noticed this one? It’s on the N-Atlantic page and happened at the same time as a few others nearer to Fagradalsfjall. Could they be related?

    Wednesday
    26.07.2017 21:40:04 64.031 -26.540 1.1 km 4.7 90.01 147.1 km WNW of Eldeyjarboði

    Wednesday
    26.07.2017 21:40:55 63.899 -22.293 6.0 km 3.3 99.0 1.0 km WSW of Fagradalsfjall
    Wednesday
    26.07.2017 21:40:32 63.899 -22.287 6.0 km 3.1 99.0 0.7 km WSW of Fagradalsfjall

  9. Thursday
    27.07.2017 14:31:35 63.903 -22.302 5.7 km 3.0 99.0 1.4 km W of Fagradalsfjall

    Magnitude more than 3 in all: 13
    Total: 466

  10. This earthquake swarm continues. It has been at slower phase today. This activity might increase again. Largest earthquake in this area was a magnitude Mw6,0 in the year period 1960 – 1970. I don’t have the exact year of that at the moment.

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