Category: Earthquakes

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Earthquake swarm on Reykjanes peninsula (close to Fagradalsfjall mountain)

Yesterday (19-December-2018) an earthquake swarm started close to Fagradalsfjall mountain on Reykjanes peninsula. Largest earthquake in this swarm had a magnitude of 3,2. This earthquake swarm is ongoing as of writing of this article.


Earthquake swarm on the Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.

The largest earthquake was felt in Grindavík village, that is the closest to this earthquake swarm. Around 160 earthquakes have been recorded in this swarm.

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Earthquake swarm close to Herðubreið

Since yesterday (18-December-2018) there has been a earthquake swarm close to Herðubreið (Wikipedia). Largest earthquake in this swarm had a magnitude of 2,7. The earthquake swarm is currently ongoing and there is a risk of larger earthquake happening in this area.


Earthquake swarm in Herðubreið area (red dots). Copyright of this image belongs to Icelandic Met Office.

Over 140 earthquakes have been recorded so far and since this earthquake swarm is currently ongoing that number is going to change. This earthquake swarm appears to be only tectonic in nature. There is no sign of magma movement in the crust on nearby SIL stations.

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Earthquake swarm in Bárðarbunga volcano

This morning (17-December-2018) an earthquake swarm started in Bárðarbunga volcano. Largest earthquake in this swarm had magnitude of 3,6. Other earthquakes have been smaller in magnitude.


Earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is a sign that Bárðarbunga volcano has not slowed down on inflating. I don’t know how much the inflation is since I have not seen GPS data for Bárðarbunga volcano in a while.

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Earthquake swarm in Öræfajökull volcano

Today (8-December-2018) there has been a fresh earthquake activity in Öræfajökull volcano. This earthquake swarm was in the northern part of the caldera, or just outside it.


Earthquake activity in Öræfajökull volcano. Copyright of this image belongs to Icelandic Met Office.

Largest earthquake in this swarm had a magnitude of 2,6. Other earthquakes had a magnitude of 0,2 to 0,8. This is normal for Öræfajökull volcano in its current phase.

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Earthquake activity in Þórðarhyrna volcano (Thordarhyrna)

During the night of 3-December-2018 earthquake activity started in Þórðarhyrna volcano (no GVP profile, under Grímsvötn volcano profile). Largest earthquake in this swarm had a magnitude of 2,1 and second largest earthquake had a magnitude of 2,0.


Þórðarhyrna volcano is located south-west of Grímsvötn volcano. Yellow dots on this image. Copyright of this image belongs to Icelandic Met Office.

Last eruption in Þórðarhyrna volcano was in the year 1902 December to 1904 12-January and was a VEI=4 eruption. An eruption happened in Grímsvötn volcano at the same time.

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Two earthquake swarms in Öræfajökull volcano

Today (1-December-2018) two earthquake swarm took place in Öræfajökull volcano.


Earthquake activity in Öræfajökull volcano. Copyright of this image belongs to Icelandic Met Office.

Largest earthquakes in this two earthquake swarms had magnitude of 1,1. All other earthquakes are smaller in magnitude. What is unusual now is that there are two earthquake swarms happening in Öræfajökull volcano. In last few months only one area has been having earthquakes at time. It is worth keeping a eye out for this change if it holds.

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Earthquake activity in Hekla volcano (there is *no* eruption risk above normal levels!)

Over the last few days there has been swarm of small earthquakes in Hekla volcano. This earthquake activity is situated in the south part of the Hekla volcano system. It is just outside the main volcano. What is causing this earthquake activity is unclear.


Earthquake activity in Hekla volcano. Copyright of this image belongs to Icelandic Met Office.

There is no eruption risk from this earthquake activity. There is nothing suggesting that for now at least this is going to result in a eruption. A lot stronger earthquake activity is needed before that can be declared!

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Earthquake swarm on Reykjanes peninsula – Bláfjöll area

Today on 24-November-2018 a magnitude 3,3 earthquake took place in Bláfjöll area. Second largest earthquake in this swarm had a magnitude of 2,9. Other earthquakes have been smaller in magnitude.


Earthquake activity in Bláfjöll area. Copyright of this image belongs to Icelandic Met Office.

The larger earthquake was felt in Reykjavík area according to news reports. The earthquake swarm appears to be ongoing.

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Earthquake in Hamarinn volcano

Today (23-November-2018) at 21:35 UTC an earthquake with magnitude of 3,5 took place in Hamarinn volcano (No GVP, is under Bárðarbunga volcano, also known as Loki-Fögrufjöll). Last unconfirmed eruption was in July 2011 and lasted ~12 hours. It resulted in a glacier flood and did not break the glacier. That eruption was only visible on harmonic tremor measurements.


Hamarinn volcano activity (green star to the left). Copyright of this image belongs to Icelandic Met Office.

It is possible that more activity is on the way, before the eruption in 2011 there was a increase in earthquakes in Hamarinn volcano. The same pattern seems to be happening now. The July 2011 eruption started without any earthquake activity, suggesting that magma is shallow in the crust already and doesn’t need any major change in pressure to start an eruption.

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Earthquake activity in Grímsvötn (Grímsfjall) volcano

During the night of 23-November-2018 there was an magnitude 3,1 earthquake in Grímsvötn volcano (Grímsfjall). Only one aftershock appeared and it had a magnitude of 0,9.


Earthquake activity in Grímsvötn volcano (green star). Copyright of this image belongs to Icelandic Met Office.

No change happened on tremor plots following this earthquake activity. Last eruption in Grímsvötn took place in 2011.

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