Minor earthquake swarm on Reykjanes ridge and TFZ (Tjörnes Fracture Zone)

The new year (2016) stars with two minor earthquake swarms in Iceland. Both earthquake swarms are small in both earthquake magnitude and number of earthquakes.

Reykjanes Ridge earthquake swarm

The earthquake swarm on the Reykjanes ridge started at 09:08 UTC and lasted until 11:24 UTC. The earthquake swarm has stopped for now, I don’t think it’s over at the moment. It’s difficult to know for sure if an earthquake swarm is over or not in this area, since earthquake swarms are complex and a minor earthquake swarm might start a bigger one few hours later.

The earthquake swarm on the Reykjanes ridge. Copyright of this image belongs to Iceland Met Office.

This earthquake swarm was small in magnitude and the largest earthquake had the magnitude of 2,1. The earthquake swarm is taking place in a volcano that last erupted in 1926 according to Global Volcanism Program. I however don’t think it is connected to any volcano related activity, this appears to be more like a rift earthquake activity.

Tjörnes Fracture Zone (TFZ)

A second earthquake swarm today took place in TFZ. This earthquake swarm was small in magnitude and largest earthquake had the magnitude of 1,9. This earthquake swarm is also rather deep, with deepest earthquake having the depth of 21,9 km (if it was properly located). This might suggest that magma was at work here. This earthquake swarm took place in a volcano that last erupted in the year 1868 (they think) (GVP information). There are two volcanoes in this area and it’s not fully clear what volcano erupted in the year 1868.

The earthquake swarm in TFZ. Copyright of this image belongs to Iceland Met Office.

This earthquake swarm is continuing and has not yet stopped. It remains a question if it is going to grow or start activity in nearby fault, since sometimes activity in one fault on TFZ can trigger earthquake activity in nearby faults. At the moment that has not happened, but it’s difficult to know for sure at the moment.


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11 Replies to “Minor earthquake swarm on Reykjanes ridge and TFZ (Tjörnes Fracture Zone)”

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      Comment has been updated for clarification.

  2. What is the strange behaviour at Godabunga (god) tremor chart. Weather or geology?

    1. Lately I see from time to time quite deep earthquakes at Básar, like the one today at 15:18:19 hrs. They’re not strong in magnitude,
      but 99% quality and it looks like a picture I know about what happened before Eyja in 2010.

      1. Those are due to the rock cooling far as I understand what is going in Eyjafjallajökull volcano. This is going to continue to happen for the next 10 – 15 years as the rock in the volcano cools down.

  3. Looks like things are shaking at Bardy again as well, any relation between these quake swarms?

    1. Yes, but only one star slightly over 3. She is not ready yet. Then it would be many stars with maybe 3 – 6 and many dots with red. These stars seems to come with some regularity and that is maybe a sign, so we will have to wait and see. Maybe this year.

  4. There is a lot of thing going on in Bárðarbunga volcano at the moment. I’m going to have a article about it later today (I need to do few things before that outside in the cold weather).

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