Earthquake swarm in Reykjanes volcano and earthquake activity on Reykjanes ridge

Today (29-December-2020) an earthquake swarm took place in Reykjanes volcano. This was just small earthquakes but the amount is considerable. This earthquake activity happens because of magma inflation in this area.


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

Reykjanes ridge

Today (29-December-2020) and earthquake with magnitude of Mw3,1 took place on Reykjanes ridge. This earthquake was far out in the ocean. Only one other smaller earthquake seems to have happened in that same area after the largest earthquake. Otherwise there has not been any more earthquake activity today out on the Reykjanes ridge.


Earthquake activity on Reykjanes ridge. Copyright of this image belongs to Icelandic Met Office.

Single earthquake on Reykjanes ridge

Yesterday (01-December-2020) at 20:40 UTC an magnitude MW3,5 earthquake took place on Reykjanes ridge. This earthquake was located close to Geirfuglasker rock on the Reykjanes ridge.


A single earthquake on the Reykjanes ridge. Copyright of this image belongs to Icelandic Met Office.

Since this was just a single earthquake it is not possible to know what happens in this area. More earthquakes might happen in this area in next few days and even larger ones.

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Reports of gas according to Icelandic Met Office close to Grænavatn lake after the earthquake yesterday (20-October-2020)

It was reported by Icelandic Met Office at 22:20 UTC that people had been noticing more gas smell close to a small lake called Grænavatn. This suggest that magma might be on the move in the crust. It is currently difficult to be sure at writing of this article. This would be inside the volcano of Reykjanes.


Grænavatn lake. Copyright of this image belongs to Google Earth / Google.


Earthquake activity on the Reykjanes peninsula at midnight 21-October-2020. Copyright of this image belongs to Icelandic Met Office.

At the writing of this article there has not been any change in harmonic tremor on nearby SIL stations. If magma is about to move that is possibly going to happen without much warning but this difficult to know for sure at the writing of this article.

Sharp increase in earthquakes in √ěorbj√∂rn mountain (Svartsengi/Reykjanes volcano)

Since around 06:00 this morning (13-June-2020) a sharp increase in earthquake activity took place north of Grindavík town. The most dense earthquake swarm was located west of the Blue lagoon with other minor swarms in other nearby areas. The active volcano is Reykjanes and Svartsengi (no Global Volcanism profile). Map can be found here and here (go to Höggunarkort).


The clusters of earthquake activity close to Grindavík town. This map can be found here (Icelandic only). Copyright of this image belongs to Icelandic Met Office.


Current earthquake activity close to Grindavík town. Copyright of this image belongs to Icelandic Met Office.

Largest earthquakes at the writing of this article have a magnitude of Mw3,5 (at 20:27 UTC) but since this earthquake swarm in ongoing that number can change without warning.

There was also considerable noise during the earthquake swarm earlier. Suggesting that something is going on but I do not know what might be for now. The noise results in the blue band thickens during the earthquake swarm.


The termor plot during the earthquake swarm. Copyright of this image belongs to Icelandic Met Office.

Current GPS data (can be viewed here) doesn’t show any major changes at the writing of this article. That might change in next few days.

Weekend long earthquake swarm in Reykjanes volcano (both of them)

This is the first article on the Iceland geology new domain and new hosting location. I’ve resolved most problems but few remains that I am working on resolving. Please report any problems in a comment here or send me an email to volcano [at] icelandgeology [dot] net. I have updated the email postlist for those who use it. Please check your spam folders and update your rules for the new addresses that are now being used.
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Over the weekend there has been a earthquake swarm in the Reykjanes volcano. Largest earthquake in this swarm had a magnitude of Mw2,6 on Saturday 06-June-2020 at 01:01 UTC. Other earthquakes have been smaller in magnitude. Around 220 earthquakes have been recorded at the writing of this article.


The earthquake activity in the volcano called Reykjanes and Svartsengi (√ěorbj√∂rn). Copyright of this image belongs to Icelandic Met Office.

The reason for this earthquake swarm is inflation that has been increasing in recent days according to GPS data that is not yet corrected or verified. That GPS data can be found here. This inflation increases the risk of larger earthquake in next few days.

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Earthquake swarm activity increases in Reykjanes ridge volcano

Since early this morning (18-May-2020) earthquake activity has been increasing in Reykjanes volcano. For the last several weeks there has been a deflation taking place in the volcanoes from Kr√Ĺsuv√≠k (possibly) and to Reykjanes volcano. Such event is to be expected with a rift volcanoes (see Krafla volcano 1980 – 1984 eruptions).


Current earthquake activity in the Reykjanes volcano and √ěorbj√∂rn mountain. Copyright of this image belongs to Icelandic Met Office.

Other than this minor activity it has been quiet in Iceland for the last month. This happens regularly in Iceland. This quiet time might last a while longer.

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Earthquake warning for Reykjanes/Reykjavík

Today (11-April 2020) an earthquake swarm took place north of Grindav√≠k town. Largest earthquake in today’s swarm had a magnitude of Mw3,2. Other earthquakes where smaller in magnitude.


The earthquake activity on the Reykjanes peninsula today. Copyright of this image belongs to Icelandic Met Office.

Icelandic Met Office has issued a earthquake warning for Reykjanes and Reykjavík area. The warning is that magnitude Mw6,3 earthquake might hit this area soon but it is not possible to give any better time frame than this. The reason for this warning is that the magma injection is now changing the stress levels in the crust and is pressuring nearby faults that might break without much warning.

Icelandic News about the earthquake warning

F√≥lk √ĺarf a√į b√ļa sig undir skj√°lfta n√¶rri sex a√į st√¶r√į (R√ļv.is)

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Small earthquake swarm on Reykjanes ridge

Today (4-April 2020) an earthquake swarm took place close to Eldey island. Largest earthquake in this swarm had a magnitude of Mw3,3 other earthquakes in this swarm were smaller in magnitude. This earthquake is in the volcano Reykjanes.


Earthquake activity on the Reykjanes peninsula today in the volcano Reykjanes. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity seems to be part of the inflation that is now happening in this part of the Reykjanes peninsula and now part of the Reykjanes ridge. This is going to continue for a while and I am not going to write about all of this earthquake activity since that would be pointless.

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Earthquake swarm on the Reykjanes ridge yesterday (28-March 2020)

Yesterday (28-March 2020) there was an earthquake swarm on the Reykjanes ridge. This was a short earthquake swarm at the writing of this article. Largest earthquakes in this swarm had a magnitude of Mw3,5. Total of seven earthquakes happened that were larger than magnitude Mw3,0. Earthquake activity has stopped at the writing of this of this article.


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

It is unclear if this earthquake swarm is connected to the earthquake activity north of Grindavík village. It is unclear if this is the volcano Reykjanes or some other volcano at this location (Eldey).

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Earthquake swarm on the Reykjanes ridge close to Eldeyjarbo√įa islands [updated]

Today (18-January-2020) at 12:38 UTC an earthquake swarm took place on the Reykjanes ridge close to Eldeyjarbo√įa island. Largest earthquake in this swarm had a magnitude of Mw4,0 according to Icelandic Met Office. Both USGS and EMSC are reporting this earthquake as a mb4,5 in automatic detection. Second largest earthquake had a magnitude of Mw3,8.


Earthquake swarm on the Reykjanes ridge not far from Eldeyjarbo√įa island. Copyright of this image belongs to Icelandic Met Office.

Other earthquakes have been smaller in magnitude. This earthquake swarm appears to be over but it is possible that this is just a limited stop in earthquake activity before it starts again. That is a common feature of earthquake swarms in this area. Earthquake can reach magnitude of Mw5,5 in this area of Reykjanes ridge.

Update on 19-January-2020

Icelandic Met Office updated the earthquake magnitudes yesterday and it now shows two Mw4,5 earthquakes taken place at 14:07 UTC and 14:17 UTC and one Mw4,0 earthquake having taken place at 15:52 UTC.


Updated earthquake map of the earthquake swarm on the Reykjanes ridge on 18-January-2020. Copyright of this image belongs to Icelandic Met Office.

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