Earthquake swarm in Krýsuvík-Trölladyngja volcano (Kleifarvatn lake)

Today (28. June 2023) an earthquake swarm took place in Krýsuvík-Trölladyngja volcano in Kleifarvatn lake. Largest earthquake had a magnitude of Mw3,2 at 09:21 UTC and was felt in Reykjavík area and other nearby towns.

Green star and red dots in Kleifarvatn lake in Krýsuvík-Trölladyngja volcano. There are red dots and orange dots in nearby Fagradalsfjall volcano.
Earthquake activity in Krýsuvík-Trölladyngja volcano. Copyright of this image belongs to Icelandic Met Office.

Its unclear what is going on at this location. Most likely explanation for this activity is stress changes because of inflation in nearby Fagradalsfjall volcano. At the moment, I don’t think there is going to be an eruption in Krýsuvík-Trölladyngja volcano. This earthquake swarm looks like its ongoing at the writing of this article.

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 in Krýsuvík-Trölladyngja volcano

Today (21. December 2022) an earthquake with magnitude of Mw3,4 took place in Krýsuvík-Trölladyngja volcano. This earthquake is because of inflation in Fagradalsfjall volcano. This possibly means that the inflation in Fagradalsfjall volcano is reaching critical point and might result in a eruption soon, when that point is reached is difficult to know.
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Magnitude Mw3,5 earthquake in Krýsuvík-Trölladyngja volcano

Today (12-October-2022) at 14:18 UTC an earthquake with magnitude of Mw3,5 took place in Krýsuvík-Trölladyngja volcano. This earthquake was followed by few smaller aftershocks. This earthquake seems to be happening because of a inflation that is taking place in Fagradalsfjall volcano and this strongly suggests that inflation in Fagradalsfjall volcano is slowly reaching critical levels. There is no eruption expected from Krýsuvík-Trölladyngja volcano as is.

Green star with few red dots just west of Kleifarvatn lake, showing increase in activity in Krýsuvík-Trölladyngja volcano
Earthquake activity in Krýsuvík-Trölladyngja volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity suggests that more stronger earthquake activity is possibly on the way. When it might start is difficult to know for sure. This has been the pattern in recent months. Earthquake activity starts to appears like this and then one day a major earthquake swarm starts. What happens now is a wait and see as before.

Inflation from start of September in Krýsuvík-Trölladyngja volcano and in Reykjanes volcano

According to GPS data from Icelandi Met Office that can be viewed here for Krýsuvík-Trölladyngja volcano (Þorbjörn) and here for Reykjanes volcano. It seems that a inflation period, at least in Krýsuvík-Trölladyngja volcano started in early September and is ongoing at the writing of this article. Earthquake activity is low at the moment, but the area has already moved a lot in recent earthquake swarms and that might he dropped the crustal stress in the area. It might also explain some of the GPS movements. I have some, but limited understanding of reading GPS data so my assessment might be off, wrong or both.

There also seems to be inflation going on, without many earthquakes in Reykjanes volcano. That seems to be have been going on since start of August. There have not been any eruption in Reykjanes volcano even after repeated inflation and deflation cycles in the volcano. Inflation cycles often have earthquake swarm activity if dyke activity follows an inflation event. That does not seem have happened this time around.

If this inflation continues, in either one or both volcanoes. It is clear a new period of high earthquake activity is about to start on Reykjanes peninsula. When that earthquake activity is going to start is impossible to know. Since recent earthquake and volcano activity has changed how the crust works in the parts of the Reykjanes peninsula where magma has been active. Since hot magma slowly softens the hard rock in the crust at depth and that lowers the earthquake activity. Rather then at the start of an volcano activity, when the crust is cold and brittle, resulting in high earthquake activity before an eruption.

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Magnitude Mw3,5 earthquake south-west of Keilir mountain

During the night of 6-September-2022 an earthquake with magnitude of Mw3,5 took place 1,2 km south-west of Keilir mountain. The depth was 4,1 km. This earthquake was part of a swarm of earthquakes in that same area. All of them smaller than this earthquake.

Green star just south-west of Keilir mountain, with blue dots showing older and smaller earthquakes in the same line to Fagradalsfjall mountain
Earthquakes close to Keilir mountain. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm and activity strongly suggests that a new earthquake time period is about to start. If it is going to end in a eruption like in July – August is a wait and see situation. How this develops is also impossible to know. It seems that for now, this earthquake swarm is over. Earthquake activity is ongoing and continuos on Reykjanes peninsula and has been since 2021 when cycle of earthquake and volcano activity started.

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The eruption in Meradalir is going to end in next few days

Today (19-August-2022) there hasn’t been any lava flow seen from the crater in Merdalir valley in Fagradalsfjall mountain according to University of Iceland, Earth Science on Facebook. Few splashes of lava have been seen coming from the crater. This has also been observed on web cameras watching the eruption. Harmonic tremor has also dropped considerably since yesterday (18-August-2022) and continues to drop.

When the eruption ends exactly is unclear, but it might happen in the next few days.

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Increasing pulse activity in the eruption signals end of the eruption

It has been reported in the news today (18-August-2022) at Rúv that more pulse activity has been seen. This results in lava being thrown up high in the air.

This is the same pattern as happened last year in the eruption in Geldingadalir valley. It took a while for that eruption to end and that might also be the case now.

Other than this, there have not been any other news of the eruption. There also has been interesting events out in the lava field, where the new lava is compressing the lava from 2021, resulting it being squeezed out at the edges. Since there is still flowing lava in the lava field from 2021 and that is going to be like that for many decades until this lava field cools through.

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Magnitude Mw3,0 earthquake in Kleifarvatn lake

Today (9-August-2022) at 11:43 UTC an earthquake with magnitude Mw3,0 took place in Kleifarvatn lake. At the writing of this article, no other larger earthquakes have taken place. Today there has been a swarm of small earthquakes in Krýsuvík-Trölladyngja volcano and in Fagradalsfjall mountain. Some of this earthquake activity are just tectonic earthquakes, this applies mostly to earthquakes that are in Kleifarvatn lake and east of Grindavík town (might also be east of Grindavík, but I am not sure). This are because of the inflation from the dyke in Fagradalsfjalli mountain that reaches to Keilir mountain. The earthquake activity before current eruption in Fagradalsfjall mountain in Meradalir valley also caused some major fault line movements over a large area. What that is going to result in when it comes to magma movements is unclear for now.

Orange and red dots over Kleifarvatn lake and close to Fagradalsfjall mountain. Showing considerable earthquake activity on Reykjanes peninsula, in the area that is now volcanic active
Earthquake activity on Reykjanes peninsula and in Kleifarvatn lake and Fagradalsfjall mountain. Copyright of this image belongs to Icelandic Met Office.

Over the last two days there has not been any visibility on web cameras of the eruption. I am hoping that the weather might clear up later today or tomorrow but that is just wait and see. There has also been heavy rain in there and I don’t recommend that anyone going there in this weather. The area is also closed and now fines can be imposed by the police on people attempting to go there when the area is closed. Kids under the age of 12 have also been forbidden to walk to the eruption. Since the distance is 7 km one day (in total 14 km) over difficult area.

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