Earthquake in Kleifarvatn lake in Krýsuvík volcano


Today (30. May 2023) an earthquake took place in Krýsuvík volcano in Kleifarvatn lake. This earthquake had a magnitude of Mw3,1. I don’t know if this earthquake was felt, it is possible. This earthquake is the second earthquake in this magnitude range in last few days.

Green star in Kleifarvatn lake. Along with few other blue dots on Reykjanes peninsula showing earthquake activity in other volcanoes. One red dot in Reykjanes volcano just west of Grindavík town.
Earthquake activity in Keifarvatn lake. Copyright of this image belongs to Icelandic Met Office.

This seems to be normal earthquake activity, it doesn’t seems to be connected to any magma movement in Krýsuvík volcano. Effects of inflation in other volcanoes (Fagradalsfjall volcano) is something that might be starting to create earthquakes. This is difficult to see in the data at the moment, but that might change in next few weeks if that is happening.


Earthquake swarm in Krýsuvík-Trölladyngja volcano


Yesterday an earthquake swarm started in Krýsuvík-Trölladyngja volcano. This earthquake swarm doesn’t appear (it might be connected, but it is difficult to know currently) to be connected to the inflation that is happening at Fagradalsfjall volcano. Largest earthquake in this earthquake swarm had a magnitude of Mw3,0. This earthquake swarm took place just south-west of Kleifarvatn lake.

Green star just south-west of Kleifarvatn lake in Krýsuvík volcano. Where few smaller earthquakes have been taking place in a small location in Krýsuvík volcano.
Earthquake activity in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm doesn’t seems to indicate an magma movement. There has not been any indicators (clear) that Krýsuvík-Trölladyngja volcano has gone active. It remains a dormant volcano.


Earthquake swarm east of Grímsey island


Yesterday (23. May 2023) at 19:22 UTC an earthquake swarm started east of Grímsey island. Largest earthquake had a magnitude of Mw3,8 at the writing of this article. This earthquake swarm is ongoing. The largest earthquake was felt in Akureyri and other nearby towns.

Green star, red and yellow dots east of Grímsey island. With other red and yellow dots and blue dots on other places on the map. Time of the map is 24. May. 23. 18:40 (Icelandic time)
Earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

Around 130 earthquakes have happened in this earthquake swarm so far. This area of Iceland has frequent earthquake activity. This earthquake swarm might increase, as they sometimes do in this area. It is impossible to know when this activity is going to stop. It took me a little longer to write this article, because this is a frequent earthquake area and I was also trying to get a little break (I also have to do other things outside of this) in next few days from geology. How that goes is to be seen.

I also want to point people out that I have set-up a website that shows Icelandic Met Office harmonic tremor charts and other information for that area.

Harmonic tremor on SIL stations in Iceland

I also have a webicorder website with an earthquake recording that I run. I am trying to figure out how to install and run seismometer in Iceland again. Its a slow work in progress for me because of the technical problems I am dealing with.



Rare earthquake in Snæfellsjökull volcano


A single earthquake took place in Snæfellsjökull volcano today (16. May 2023) at 14:46 UTC. This was a single Mw2,0 earthquake with depth of 0,1 km. This earthquake was 5,4 km east of Hellisandur town. If this earthquake was felt is not known to me (nothing reported in the news).

Red dot just north of the glacier of Snæfellsjökull volcano. This is on Snæfellsnes peninsula.
Earthquake in Snæfellsjökull volcano. Copyright of this image belongs to Icelandic Met Office.

It is rare to see earthquakes like this on Snæfellsjökull volcano and this is the first earthquake I write about from Icelandic Met Office data. Research has shown that small earthquake activity does regularly happen in Snæfellsjökull volcano.


New hot springs detected at Road 1 in Hveradalabrekka in Hengill volcano

The Icelandic Road administration did send out this news report today that new hot springs have been detected at Hveradalabrekka on Road 1 in Hengill volcano. This is an area that sees some heavy traffic. I can’t post pictures here because of copyright, but they can viewed in the news article below.

According to the Icelandic Road administration it seems that the area in question has been getting warmer for some time. According to them the current temperature around 86 degrees celsius. This is the area on a map from website.

The main road one as it is south of Reykjafell mountain in Hengill volcano. Also on this map is Þrenslahnjúkur and Hveradalir are marked in on the map.
The main road 1 on Hengill volcano. Close to the area that is now warming up. Screenshot of map from

Next is to check why this is happening and if there is any risk the Road 1 in this area and if anything can be done if that’s the case. I am unclear on what is going on, since this area (I don’t think this one, but nearby) is known for hot spring activity. There has been some earthquake activity at this location in recent months and that is possibly connected to this new hot spring activity. On 9th of May this area had a Mw1,1 earthquake at the depth of 4 km. Over a time period of 130 days, the number of earthquakes in this area is not unusual for Hengill volcano or Reykjanes peninsula in general. This area of Road 1 might continue to get warmer over the next few months.

Vegagerðin news in Icelandic

Jarðhitavirkni undir Hringvegi ( – has pictures of the area.


Rúv has published a news about this and has a video of the area where this new hot spring activity is happening. This is new because vegetation is in this area and is now dying off.

Allt að 100 gráðu hiti mælist við veginn (Rú, Icelandic)

Update 2

Icelandic Road Administration web camera shows the new hot spring area. The web camera can be viewed here.

Article updated 12. May 2023 at 20:41 – Reykjavík time (+0 GMT)
Article updated 14. May 2023 at 13:01 – Reykjavík time (+0 GMT)

Earthquake swarm in Þórðarhyrna volcano

Today (11. May 2023) there was a earthquake swarm in Þórðarhyrna volcano. This are small earthquakes, but their location and depth suggest that this is a dyke intrusion taking place at this location.

Earthquake swarm in south-west part of Þórðarhyrna volcano. This volcano is located in Vatnajökull glacier, just few km south of Grímsfjall volcano, is part of the Grímsfjall volcano fissure swarm. Time on image 11. May. 23 13:10.
Earthquake activity in Þórðarhyrna volcano. Copyright of this image belongs to Icelandic Met Office.

Þórðarhyrna volcano is part of Grímsfjall volcano fissure swarm, that connects to Laki eruption fissures. Last eruption in Þórðarhyrna volcano was in the year 1902 to 1904 and had the VEI=4 according to Global Volcanism Program report that can be read here.

Earthquake swarm in Reykjanes volcano (out in the ocean)

During the night of 4. May 2023 an earthquake swarm took place in the Reykjanes volcano out in the ocean. This was not a large earthquake swarm. Largest earthquake recorded had a magnitude of Mw3,4. Other earthquakes where smaller in magnitude.

Green star and a cluster of earthquakes on down and west part of this image. Showing the Reykjanes peninsula. Few other earthquakes are dotted on the map in other volcanoes on the Reykjanes peninsula.
Earthquake swarm in Reykjanes volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity suggests an dyke intrusion in this area. This is part of Reykjanes volcano, but that volcano is in part out in the ocean. The Reykjanes volcano has been having regular dyke intrusion in recent years without it resulting in an eruption. That is most likely what is going to happen now.

Strong earthquake swarm in Katla volcano

This morning there was a strong earthquake swarm in Katla volcano. At the writing of this article the largest earthquake had a magnitude of Mw4,8 and the second largest earthquake had a magnitude of Mw4,7, the third largest earthquake had a magnitude of Mw4,5. This earthquakes where felt in nearby farms and towns close to Katla volcano. Currently, a lot of smaller earthquakes have happened in Katla volcano.

Red dots and green stars in Katla volcano caldera showing the main earthquake activity.
Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

There are no changes in harmonic tremor levels at the writing of this article. That makes an eruption unlikely to happen now. That might change later without warning. The air aviation code has been moved to yellow and can be viewed here.

I’ll write a new article if something more happens.

Earthquake swarm north of Grindavík town, next to Blue Lagoon

This morning (25. April 2023) an earthquake swarm started north of Grindavík town, next to the Blue Lagoon. This earthquake swarm is ongoing at the writing of this article. If this is going to result in a eruption is impossible to know. The magma has reached the depth of 2 km and that is not good news if this continues to intensify. Large earthquakes do not need to happen before an eruption starts under the correct conditions in the curst and there has been a lot of dyke activity in Reykjanes volcano in last 3 years. Without that activity resulting in a eruption.

Red dots north of Grindavík town and next to the Blue lagoon on the map (the lagoon doesn't appear on the map). Time on map 25. Apr. 14:00.
Earthquake activity north of Grindavík town. Copyright of this image belongs to Icelandic Met Office.

Eruption at this location would be bad, because of the tourist infrastructure next to this location that is the Blue Lagoon. Only thing that can be done now is to monitor the situation and see if it changes from what is currently happening.

It is possible to view the earthquake swarm in high resolution on Skjálfta-Lísa and other private websites that have similar maps.

Earthquake swarm in Grímsfjall volcano

Today (23. April 2023) at 15:!5 UTC an earthquake swarm took place in Grímsfjall volcano. Largest earthquake in this swarm had a magnitude of Mw3,3. Few other smaller earthquakes also took place.

Green star and red dots under it in Grímsfjall volcano. Also in this image is the earlier earthquake in Bárðarbunga volcano, shown with a green star.
Earthquake activity in Grímsfjall volcano. Copyright of this image belongs to Icelandic Met Office.

There are no signs that Grímsfjall volcano is about erupt following this earthquake swarm. That might change without warning, but seems unlikely to happen at the moment. More earthquakes might happen in next few hours.