Category: Swarm

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Small dyke intrusion into Sundhnúkagígar in Svartsengi volcano during the night (4-November 2024)

During the night of 4th November 2024 at 02:30 to around 03:00 UTC an small dyke intrusion took place in Sundhnúkagígar crater in Svartsengi volcano. Around 20 to 25 earthquakes took place in this minor dyke intrusion that stopped as quickly as it had started.

Dots of small earthquakes all over Reykjanes peninsula. The dots in Svartsengi volcano, in Sundhnúkagígar crater row. This group of small earthquakes is the dyke intrusion that was trying to happen during the night.
Earthquakes in Svartsengi volcano, Sundhnúkagígar crater row. Copyright of this image belongs to Icelandic Met Office.

There is a ongoing risk of more sudden dyke intrusion like this. Those can go on for hours and might not even erupt at all. A lot more earthquake activity is going to happen if such a dyke intrusion happens.

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Earthquake activity in Katla volcano

Today (30-September 2024) at 05:35 UTC an earthquake with magnitude of Mw3,6 took place in Katla volcano. This earthquake was not felt. This earthquake happens right after a minor glacier flood from Mýrdalsjökull glacier.

Green star in the north part of Katla volcano. A long with few smaller dots showing smaller earthquakes that also happened.
Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

There has not been any more earthquakes following this activity. Overall the activity at the writing of this article is quiet and has been so since the small eruption in July in Katla volcano. Small and large glacier flood can happen without warning from Mýrdalsjökull glacier.

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Two earthquakes in Krýsuvík-Trölladyngja volcano

Today (29-September 2024) at 17:40 and 17:43 UTC two earthquakes with magnitude of Mw3,6 and Mw3,3 took place in Krýsuvík-Trölladyngja volcano. This earthquakes where felt in Reykjavík and nearby towns.

Two green stars on top of each other along with blue and orange dots that are showing smaller earthquakes from today and last few days in the same area. Earthquakes in other areas of Reykjanes peninsula.
Earthquakes in Krýsuvík-Trölladyngja volcano. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity has been increasing in last few weeks in Krýsuvík-Trölladyngja volcano. The reason for this increase is unclear at this moment.

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Earthquake with magnitude Mw5,0 in Bárðarbunga volcano

Today (3-September 2024) at 16:31 UTC an earthquake with magnitude of Mw5,0 took place in Bárðarbunga volcano. This was followed by few smaller earthquakes and there has been increased minor earthquake activity in Bárðarbunga volcano in recent days.

Green star in the east part of Bárðarbunga volcano in Vatnajökull glacier. Along with few dots that are orange in colour and mark the locations of smaller earthquakes.
Earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This size of earthquake is going to happen in Bárðarbunga volcano at least once to twice a year for the next 40 to 60 years. I am not expecting an eruption in Bárðarbunga volcano until at least 2120 and no earlier then the year 2090. Until then, its going to be decades of earthquake activity like this one.

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Earthquake swarm in Krýsuvík volcano

Yesterday (25. August 2024) at 23:56 UTC an earthquake with magnitude of Mw3,6 took place in Krýsuvík volcano. This earthquake was felt in Reykjavík area and other nearby towns.

Green star just south of Kleifarvatn lake. Along with few orange dots showing the smaller earthquakes.
The earthquake activity in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.

This is a normal tectonic earthquake. I don’t know if it is a response to stress changes because of Svartsengi volcano cycle of inflation and deflation. This earthquake swarm seems to be over for now.

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Update on the eruption in Svartsengi on 23. August 2024 at 17:39 UTC

This is a short update on the eruption in Svartsengi volcano. This information might go outdated quickly.

  • The eruption is now on a 2 km long fissure. It is located just north of Stóra Skógfell. This is the most north part of the eruption fissure so far. Total length of the eruption fissure is 7 km, but most parts of it have stopped erupting.
  • The eruption can be seen from Reykjanesbraut on the way to Keflavík or Keflavík airport.
  • It is impossible to know how long this eruption is going to last. But harmonic tremor is already dropping and has been doing that since around 06:00 this morning. This eruption might last a day or it might last a month, at current time it is impossible to know.
  • Icelandic Met Office lost a seismometer (Litla Skógarfell) and a GPS station under lava in this eruption. So far, its only two stations. Since one (Norðurljósavegur) GPS station had been moved out of harms way earlier in August.
  • Largest earthquakes had the magnitude of Mw4,1 and Mw3,3. The larger one was just off Fagradalsfjall volcano and the smaller one was in Keilir mountain. The larger one was felt in Reykjavík and nearby areas.

This eruption can change without warning. If anything worth reporting happens. I’ll write a new article about what is going on.

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Eruption has started in Svartsengi volcano, Sundhnúkagíga

Eruption started in Svartsengi volcano, in Sundhnúkagíga crater row. The eruption is powerful as is the normal with this type of eruption. The time from earthquake start to the eruption started was around 30 to 40 minutes.

I’ll post more information if I have anything to report. Last eruption in this same area started on 29. May and ended on 22. June.

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Possible small eruption in Katla volcano, glacier flood ongoing

Starting sometimes late yesterday (26-July 2024), a small eruption seems to have started in Katla volcano. At the writing of this article, the eruption seems to be over, but it might restart at any time without warning, it is impossible to know at the moment, since harmonic tremor is unclear for now because of the glacier flood. Largest earthquake at the writing of this article had magnitude of Mw2,9.

Red dots showing small earthquakes in east part of Katla volcano caldera in Mýrdalsjökull glacier.
Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Met Office.
Harmonic tremor plot from Icelandic Met Office. Showing increased harmonic tremor starting at around midnight of 27-July 2024. Reaching peak few hours later before starting to lower again.
The harmonic tremor in Austmannsbunga SIL station. Copyright of this image belongs to Icelandic Met Office.

Glacier flood is ongoing and is going to be ongoing for next few hours. The area around Mýrdalsjökull glacier is dangerous because of this.

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Earthquake swarm in Brennisteinsfjöll volcano

Today (5-July 2024) an earthquake swarm started in Brennisteinsfjöll volcano. Largest earthquake had a magnitude of Mw3,1 at 07:17 UTC. This earthquake was felt in Reykjavík and nearby areas.

The earthquake swarm on the left side on this image, with orange dots because of the age of the earthquakes on the map. Green star shows the largest earthquake.
Earthquake activity in Brennisteinsfjöll volcano. Copyright of this image belongs to Icelandic Met Office.

At the writing of this article, the earthquake swarm seems to have stopped. It might restart again, since that is common in this volcano and in this area.

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Small earthquake swarm next to Bláfjallaskáli in Brennisteinsfjöllum volcano

Yesterday (26-June 2024) at 17:07 UTC an earthquake with magnitude of Mw3,1 took place in Brennisteinsfjöll volcano, not far from Bláfjallaskáli area. That is a popular skiing area during the winter.

Green star just south of Reykjavík area in the Bláfjöll area in Brennisteinsfjöll volcano. Smaller dots all over Reykjanes peninsula showing smaller earthquakes in the last 48 hours.
The earthquake activity in Brennisteinsfjöll volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake was part of a small earthquake swarm in the same area. It seems to have quieted down again.