Category: Deflation

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Update on the eruption in Sundhnúkagígar in Svartsengi volcano at 17th July 2025 at 00:43 UTC

This is a summary update with best information I have at the moment. Some information might be out of date without me knowing about it.

  • The eruption fissure reached 2,5 km when it was at the longest length. It has started to get smaller as the eruption has dropped in intensity over the last few hours.
  • This is the most northern eruption in Svartsengi volcano so far.
  • The lava flow is towards Fagradalsfjall volcano and into Fagradals valley and is now filling up, if it has not done so already.
  • Harmonic tremor looks stable at the writing of this article. This can change quickly and without warning.
  • Early GPS data suggest that deflation of Svartsengi volcano is around 100mm for the last 12 hours where it is most. Depending on the GPS station location in the volcano system.
  • Earthquake activity has stopped or almost stopped in the area.
  • I don’t expect this eruption to last more than few days. However eruptions in this area sometimes continue in one crater at very low volume for a several weeks. At current time its impossible to know if that happens.
  • Fog is currently blocking all view of the eruption. So its impossible for me to know what is happening visually.
  • Gas pollution has been a problem in this eruption and wind direction. This might not improve until the eruption ends.

If there is anything more to report. I’ll post update here about it. I don’t expect there is going to be any need for any future update at the writing of this article.

Updated at 00:59 UTC on 17th of July with missing information.

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Update on the eruption in Sundhnúkagígar on 22. March 2024 at 03:42 UTC

This is a short update on the eruption in Sundhnúkagígar in Svartsengi volcano.

  • The eruption is now the longest eruption in Svartsengi volcano since this eruption cycle started on 18. December 2023.
  • There are five to seven craters erupting at the writing of this article. Bad weather has blocked the view to the eruption site for most of yesterday and today (22. March 2024).
  • The outflow of lava, based on my own estimate (that might be wrong) is that the flow is around 20m3/sec. Its not a lot at the moment and that means the lava flow goes shorter distances.
  • Large lava ponds have formed and those empty regularly, resulting in a fast moving flow of lava going down to any area downhill from the eruption.
  • One person working at the be Blue Lagoon got sick from SO2 poisoning on 20. March 2024. That person did go to a hospital and is now recovering fine, according to the news.
  • A gravel mine got filled with lava yesterday (21. March 2024) when the lava pond broke and emptied it self.
  • Bad weather makes it difficult to monitor the eruption. Next good weather won’t be until Saturday (23. March 2024).
  • Early GPS data however suggest that there is not much of a deflation or inflation happening in Svartsengi volcano. That means the magma is flowing directly to the eruption and making minimal stop on the way to the surface.

This is all for now. Next update is going to be when something new happens. If this eruption is going to last for a long time. I’ll post regular updates on it. But for now, this eruption is just going to continue as is now doing.

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Update on the eruption in Sundhnúkagígar (Svartsengi volcano) on 19. March 2024 at 01:21 UTC

This is a short update since there has not been a lot of change in the last twenty four hours.

The eruption is stable at the writing of this article. This might change without warning.

  • Harmonic tremor has been stable in the last 24 hours. With almost no fluctuation.
  • GPS stations around Svartsengi volcano show a deflation around 200 to 300mm at the writing of this article. There’s uncertainty in this data because of bad weather in Iceland.
  • The lava from this eruption has reached 5,85 km2 according to Icelandic Met Office.
  • There is little to no earthquake activity in this area, but measurements might be blocked by bad weather.
  • Crater build up continues in this eruption.
  • The lava is around 350 meters from Suðurstrandarvegi and around 700 meters from reaching out in the ocean.

If there is a change in the eruption. I’ll write about it quickly as I can. Next article should be by 21. March 2024 if the eruption is still ongoing by that date.

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Update for Sundhnúkagígar eruption on 20. December 2023 at 18:29 UTC

This is a short update and information here might go outdated quickly and without warning.

This eruption is a short one and that’s how eruptions in Iceland are normally. This eruption might end by Friday to Monday, depending on what happens.

  • The flow from the craters that are erupting is around 10m3/sec. This is low compared to the start of the eruption on Monday 18. December 2023 and suggest that this eruption is going to end soon.
  • GPS data shows that Svartsengi volcano has only lowered around 80mm since Monday. This means there’s a lot of lava in Svartsengi for new eruptions to happen without much warning.
  • Earthquake activity along the fault valley has resumed, after stopping soon after the main eruption took place. This is interesting and I am unclear what this means at the writing of this article.
  • Icelandic Met Office is reporting that the eruption, even is small, is stable at the writing of this article. This can change without warning.
  • The lava field is now, according to best measurements around 3,7 km2 (square kilometres).
  • According to University of Iceland Earth science department, the chemical makeup of the lava shows that its more evolved in part than the lava in Fagradalsfjall volcano. This can be read here (new link, now in English). This means that this magma stopped on its way to the surface and cooled a little and changed chemical makeup before erupting.
  • This new lava is different than the lava that erupted 2400 years ago at the same location. Why that is I don’t know. It is going to take few years to maybe get an answer to this question when the experts have done their research and published their science papers.
Earthquake activity along the rift valley in Svartsengi volcano shown by a green stars, red and orange dots showing smaller earthquakes.
Earthquake activity along the rift valley. Copyright of this image belongs to Icelandic Met Office.

It is interesting to see that Þorbjörn mountain continues to get lower, based on GPS data from today (20. December 2023). Icelandic Met Office has released new danger map and that can be found here in English on Icelandic Met Office website.

This is all the information I know of today (20. December 2023). Next article should be tomorrow (21. December), unless something happens then I’ll try and write article soon as I can.

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Deflation has stopped in Bárðarbunga volcano

According to a short news today on Rúv it appears that Bárðarbunga volcano has stopped deflating and activity is slowing down in new hydrothermal vents that opened up during the most active period of Bárðarbunga volcano. The rift activity that has started in this region of Iceland is not over yet, even if there is nothing happening at current time.

It is impossible to know when next period of eruptions starts in this area. Until then it is going to remain mostly quiet.

Icelandic news

Sigið í Bárðarbungu er hætt (Rúv.is)

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Bárðarbunga volcano continues to deflate

The eruption in Holuhraun is over and nothing has been happening the crater for the past three weeks. This does not mean the deflation is over in Bárðarbunga volcano. Currently Bárðarbunga volcano continues to deflate at the rate of 2cm/day, total deflation since 31-August-2014 is around 60 meters. All this deflation has started to move the glacier inside the caldera, creating what appears to be inflation, that change in the glacier, that inflation is 1,5cm/day. That inflation should be 3-4cm/day according to Icelandic Met Office, so the difference is the deflation taking place. Currently the GPS sensor inside Bárðarbunga volcano caldera is not working so the only way to monitor this deflation is to continue to fly over the glacier and measure it that way. Next scheduled flight for Bárðarbunga volcano is going to take place after Easter.

News in Icelandic

Bárðarbunga hefur sigið um 60 metra (Rúv.is)

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The eruption in Holuhraun has ended

The eruption in Holuhraun ended yesterday (27-Februar-2015) it seems. Current status of Bárðarbunga volcano is now yellow. While the eruption is over the area continues to be closed for public due to danger of new eruptions in the area, both outside the glacier and inside it. It is unclear what is going to happen next in Bárðarbunga volcano. There is also a considerable gas emission from Holuhraun crater at the moment and that gas is toxic.

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Current earthquake activity in Bárðarbunga volcano and for the past 48 hours. Copyright of this image belongs to Icelandic Met Office.

What happens next is not known. There is a high risk of new eruption taking place under the glacier. I don’t know if subsidence of the caldera is going on at the moment or has stopped. It might take days, weeks or months until inflation starts again in Bárðarbunga volcano. This is a rifting event and that means this is far from over. For the moment however it is going to be a little break (at least, it can be hope) in the activity in Holuhraun or Bárðarbunga volcano. The lava and the crater continue to be extremely hot (~800C) and are going to remain hot for many years (5 years?).

Since the eruption in Holuhraun is over I won’t post any update next Wednesday. Next update is going to be when something happens.

Icelandic News

Icelandic Met Office information website
The eruption has come to an end (Icelandic Met Office)

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Article updated at 16:59 UTC.

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Bárðarbunga volcano weekly update for 25-February-2015

There hasn’t been a lot of new information about the eruption in Holuhraun this week. Earthquake activity continues in Bárðarbunga volcano as before, but at slower rate and earthquake with magnitude 3,0 and larger have almost stopped at the moment.

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Earthquake activity in Bárðarbunga volcano for the past 48 hours, no earthquake above magnitude 3,0 has been recorded for the past few days. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity continues in Bárðarbunga volcano, but at far lower level than just few weeks ago. Subsidence has slowed down considerably at the moment. It has not stopped. There are earthquakes along the dyke from Bárðarbunga volcano, suggesting that pressure might be increasing in it. That in it self might not lead to a new eruption.

The eruption in Holuhraun continues, but at low level. The only remaining vent that is now open is building a new crater inside the big crater that has now stopped erupting. The eruption might continue at this low level for many more months. Current status of the eruption is not known due to extremely bad weather in Iceland at the moment. The eruption is not over, it is however really small at the moment.

Due to bad weather I am expecting that my geophones might go offline due to loss of power or other connection problems that might happen due to this bad weather. Information about the storm can be found here. This is not a weather to travel outside. If you are in Iceland, stay where you are and don’t travel until the weather has passed over Iceland.

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Article updated at 16:35 UTC.

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Bárðarbunga volcano weekly update on 18-February-2015

There has not been major change in Holuhraun eruption since last week. The eruption continues at low phase at the moment far as I know. Bad weather has prevented scientists monitoring the eruption in the past few days. There continues to be considerable activity in Bárðarbunga volcano, the volcano continues to deflate.

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Earthquake activity in Bárðarbunga volcano for the past 48 hours. Green star is a magnitude 4,1 earthquake that took place at 14:18 UTC on 18-February-2015. Copyright of this image belongs to Icelandic Met Office.

New vents might open up along the dyke once current vent closes up in Holuhraun. There seems to be several weak points forming along the dyke, based on current earthquake activity (cluster of earthquake activity). There is also a risk this might happen before the eruption in Holuhraun ends. If the pressure inside the dyke is enough to start an eruption in new location before that.

The long term view of Bárðarbunga volcano

When the eruption in Holuhraun ends it is not going to mean the end of activity in Bárðarbunga volcano. Current activity is just a start of activity that is going to last for several years. According to Ármann Höskuldsson volcanologist in a interview at Rúv News yesterday. While it is not known for how long the rift episode that has now started in Bárðarbunga volcano is going to last. It is clear that this is at minimum of 5 years, common time for rift zone activity is up to ten years. There is a chance it is going to last longer than that. When it comes to Bárðarbunga volcano how long such activity is not known. There are also going to be breaks, with no activity at all between eruptions. Activity in Bárðarbunga volcano won’t be declared over until it is once again stable. Eruption activity in Bárðarbunga volcano might not end until the year 2026 at the longest.

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Bárðarbunga volcano update for 10-February-2015

No mayor changes have been reported since my last update. Bárðarbunga volcano continues to subside at slow rate. The eruption in Holuhraun continues around the same rate as before. Sulfur dioxide pollution continues to be a problem. There are now also worries about the amount of sulfur dioxide that is bound into snow, since once spring arrives in Iceland (April – May) that snow is going to melt and flood the grasslands and rivers with sulfur dioxide pollution, when sulfur dioxide is combined with water it creates acid rain (that has also been a problem in Iceland).

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Earthquake activity in Bárðarbunga volcano for the last 48 hours. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity remains high in Bárðarbunga volcano, but there has not been a magnitude 5,0 earthquake since January-8 according to latest reports. Largest earthquake in past 48 hours had the magnitude of 4,7. I did notice today (10-Feburary-2015) several deep earthquake had taken place. This might suggest that magma is coming up from depth into Bárðarbunga volcano. It is difficult to know for sure what this means at the moment.

Correction of misunderstanding regarding Hreppar Microplate

Hreppar microplate has nothing to do with the eruption and rifting episode in Bárðarbunga volcano. Details on Hreppar microplate can be found here (page 18). Few more details can be found here (page 9).

New article schedule for Bárðarbunga volcano updates

With less activity in Bárðarbunga volcano I am lowering the amount of articles I am writing about it. Since it is hard to write about the same thing for five months. There won’t be any article on Friday (13-Feburary). Next update is going to be on Wednesday 18-Feburary. After that I am going to have weekly updates on Bárðarbunga volcano activity.

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