Author: Jón Frímann

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Dyke intrusion in Þórðarhyrna volcano

Yesterday (24-January 2026) from 10:27 UTC and until 12:02 UTC an earthquake swarm took place in Þórðarhyrna volcano. This earthquake swarm looks like a dyke intrusion in that volcano. Largest earthquake had a magnitude of Mw2,8 and other earthquakes where smaller in magnitude.

Just south-west of Grímsfjall volcano, in the white snow on the map of Vatnajökull glacier a cluster of earthquake is located in Þórðarhyrna volcano.
Earthquake activity in Þórðarhyrna volcano. Just south-west of Grímsfjall volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is showing a increase in activity in this volcano over the recent years. There has not been a eruption in Þórðarhyrna volcano since 1830 to 1903 (year is uncertain). This volcano is inside Grímsfjall volcano fissure swarm. There are no clear signs that eruption is going to happen any time soon. This increase in earthquake activity might continue for next 10 to 20 years before an eruption happens in Þórðarhyrna volcano. There are more information about Þórðarhyrna volcano on Icelandic Volcanoes website.

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Earthquake in Torfajökull volcano

A earthquake with the magnitude of Mw3,3 took place in Torfajökull voclano at 02:42 UTC on 20-December 2025. A second earthquake with magnitude of Mw2,5 took place at 03:12 UTC. After this, there has not been any more earthquake activity in Torfajökull volcano.

Green star in Torfajökull volcano. That is located north of Mýrdalsjökull glacier.
Green star in Torfajökull voclano. Copyright of this image belongs to Icelandic Met Office.

More earthquake activity in this location or nearby location can’t be ruled out. Bad weather might block recording of those earthquakes, since the weather forecast for next few days is not good.

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Earthquake activity in Hamarinn volcano

Today (06-December 2025) at 10:10 and 10:13 UTC two earthquake with magnitude of Mw3,1 and Mw4,0 took place in Hamarinn volcano. This was followed by few smaller earthquakes in the same area.

Two green stars on top of each other in western Vatnajökull glacier. This is in Hamarinn volcano.
Two green stars in Hamarinn volcano. Copyright of this image belongs to Icelandic Met Office.

No other activity has happened following this earthquake activity. There has not been any change in harmonic tremor levels. I am not expecting more activity at the writing of this article.

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Earthquake in Askja volcano

A magnitude Mw3,5 earthquake took place in Askja volcano today (9-November 2025) at 09:39 UTC. This was a single earthquake with no aftershocks. It is unlikley that more earthquakes are going to happen following this earthquake.

Green star at the bottom of the image in Askja volcano. The green star is in the northern part of the caldera in Askja volcano.
Earthquake activity in Askja volcano. Copyright of this image belongs to Icelandic Met Office.

There has been some inflation in Askja volcano in recent years. It is my view that that inflation is not going to result in a eruption for the next few decades. That might change if the situation changes in Askja volcano. At the current time, that seems unlikely to happen.

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Magnitude Mw5,4 earthquake in Bárðarbunga volcano

Today (29-October 2025) at 16:46 UTC an strong earthquake took place in Bárðarbunga volcano. This earthquake had a magnitude of Mw5,4. It was not felt according to news. This earthquake is the result of inflation that is happening in Bárðarbunga volcano and has been since its eruption ended in the year 2015.

Green star in Bárðarbunga volcano, located in northern part of Vatnajökull glacier. A lot of red dots showing smaller earthquake activity.
Green star showing the earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

There was some aftershock activity, but it has been minimal. Currently there are no signs of an eruption is about to start in Bárðarbunga volcano.

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Strong earthquake swarm in Katla volcano

This morning on 20-October 2025 an strong earthquake swarm started in Katla volcano. Strongest earthquake so far had a magnitude of Mw4,5. It was most likely felt in nearby populated areas. Several earthquakes with magnitude above Mw3,0 also took place. This earthquake swarm is ongoing, but it happens in waves and at the writing of this article there is a quiet period happening.

Red dots showing smaller earthquakes in Katla volcano. Green stars showing stronger activity in Katla volcano caldera.
Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

At the moment there has not been any signs of magma movement. That might change without warning. There also not been any change in glacier water from Mýrdalsjökull glacier. That only show up after 4 to 8 hours, since it takes time for the glacier water to travel to the glacier rivers from Mýrdalsjökull glacier. If anything more important happens. I’ll post a new update on what is going on.

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Strong earthquake in Hamarinn volcano

Today (18. September 2025) at 00:04 UTC an earthquake with the magnitude of Mw3,6 took place in Hamarinn volcano, that is south of Bárðarbunga volcano.A small aftershock took place soon after the largest earthquake. There are no signs that an eruption is about to happen. Last year this area also had an earthquake, but a bit smaller one.

Green star in Hamarinn volcano, south of Bárðarbunga volcano on Vatnajökull glacier.
Earthquake in Hamarinn volcano. South of Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

It is difficult to know if any more earthquakes are going to happen in this area. At the moment that is unlikely.

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Strong earthquake in Brennisteinsfjöll volcano on 18th August 2025

On 18-August 2025 at 18:10 UTC an earthquake with magnitude of Mw3,8 took place in Brennisteinsfjöll volcano. This earthquake was felt in Reykjavík and nearby towns.

Green star in Brennisteinsfjöll just south of Reykjavík in Iceland on Reykjanes peninsula.
Earthquake swarm in Brennisteinsfjöll volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm has stopped. There is a lot of stress on the crust in this part of Reykjanes because of the ongoing inflation and deflation cycle in Svartsengi volcano. Larger earthquake might happen without warning.

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Strong earthquake in Bárðarbunga volcano on 27-July 2025

On the 27-July 2025 at 23:39 UTC an earthquake with magnitude of Mw5,2 took place in Bárðarbunga volcano. A second earthquake with magnitude of Mw3,1 took place at 23:41 UTC. That second earthquake is embedded into the first earthquake and that makes it impossible to see it in earthquake data without good analyse. The largest earthquake was felt in Akureyri, far north of Bárðarbunga volcano.

Two green stars in Bárðarbunga volcano. The northern green star is the larger earthquake with magnitude of Mw5.2.
The earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Office.

This is normal earthquake activity as Bárðarbunga volcano continues to inflate. This large earthquake happen every few month in Bárðarbunga volcano.

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Earthquake swarm in Krýsuvík volcano

During the night of 20-July 2025 at 02:55 UTC an earthquake with magnitude of Mw3,5 took place in Krýsuvík volcano. This earthquake was felt in Reykjavík and other nearby area.

Green star east of Kleifarvatn in Krýsuvík volcano. Few blue dots showing older earthquakes are also in the same location.
Green star in Krýsuvík volcano. Showing the main earthquake activity area. Copyright of this image belongs to Icelandic Met Office.

This is a tectonic earthquake. Possibly adjustment in the crust the eruption that is happening in Svartsengi volcano. Since the eruption results in the Svartsengi volcano to deflate. This earthquake swarm seems to be over for now.