Harmonic tremors – Page 6 – Iceland geology

May 11, 2015

Small glacier flood from Grímsfjall volcano caldera

Today (11-May-2015) a glacier flood started from Grísmfjall volcano caldera. This is not a dangerous glacier flood due to its small size. There is however a danger from sulphur gases and other gases that dissolve when the pressure is dropped on the water. If people get too close to the Gígukvísl glacier river where the flood comes from Vatnajökull glacier they risk a damage to there eyes and lungs due to burning effects from the gases in the air.

Increased harmonic tremor from Grímsfjall volcano. Copyright of this image belongs to Icelandic Met Office.

There is now a increased harmonic tremor from Grímsfjall volcano. It is not clear why that is, it is either the glacier flood or hydrothermal vents boiling at the bottom of the lake due to the sudden pressure release on them. There is nothing suggesting that an eruption is going to follow this glacier flood from Grímsfjall volcano. Last glacier flood took place in 2014.

Icelandic News

Lítið hlaup í Gígjukvísl (Rúv.is, Icelandic)

February 28, 2015February 28, 2015

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.

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.

February 27, 2015

No lava flow visible in Holuhraun main crater

Today (27-February-2015) there was no visible lava flow from the main crater in Holuhraun. The eruption is not officially over, this however seems to be the end of this eruption in Bárðarbunga volcano. It appears that gas emission continue from the crater and Holuhraun at the moment, it can be expected those are going to end in next few weeks to months.

New video of the crater in Holuhraun can be found here.

Ekki glóð í gígnum í Holuhrauni – Myndband (Rúv.is, video)

It is not known what happens next in Bárðarbunga volcano or when it is going to happen. All that can be done is to wait and see.

February 25, 2015February 25, 2015

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.

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.

February 18, 2015February 18, 2015

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.

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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February 10, 2015February 10, 2015

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).

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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February 6, 2015

Bárðarbunga volcano update for 06-February-2015

This update is going to be slightly shorter than usual because I am sick (I got flu at the moment).

Over the past two weeks there has been considerable drop in the lava lake.
Lavafall was seen on new images (in the one of the lava rivers) in Holuhraun yesterday (05-February-2015).
Earthquake activity in Bárðarbunga volcano continues to drop. It continues to be classified as considerable.
GPS data show that the area around Bárðarbunga volcano continues to subside towards the volcano.
The eruption in Holuhraun might end in 5 – 12 months, there is also a chance it might go on for years at low level. There is no way to know for sure.
Sulfur dioxide pollution continues to be a problem in Iceland. Depending on wind direction. Current release of Sulfur dioxide from the eruption in Holuhraun is from 30.000 tons/day and up to 80.000 tons/day.

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

Largest earthquake in the past 48 hours was a magnitude 4,9 earthquake in north-east Bárðarbunga volcano. It has now been one month since magnitude 5,0 or larger earthquake took place in Bárðarbunga volcano.

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February 3, 2015February 5, 2015

Bárðarbunga volcano update for 3-February-2015

Since last update of activity in Bárðarbunga volcano there have not been major changes in Holuhraun eruption. The lava lake in the crater has lowered by several meters based on pictures from Holuhraun today. Large cliffs have formed where the lava river is, I don’t have exact depth for them, but it is around 30 – 40 meters according to my estimate (it might be wrong).

Bárðarbunga volcano earthquakes for the past 48 hours. Copyright of this image belongs to Icelandic Met Office.

Largest earthquake in the past 48 hours had the magnitude of 4,6. Other earthquake activity is as it has been for the past three to four weeks in terms of earthquake activity. What I have been observing in the past few days are harmonic tremor spikes, the largest one happened on 30-January-2015, after that smaller harmonic tremor spikes have been taking place. It is unclear at the moment why this is happening. This might be due to changes in hydrothermal areas under the glacier or magma is on the move inside the volcano.

Update 1: New webcamera close to the eruption. It can be viewed here.

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Article updated at 20:30 UTC.
Article updated at 20:36 UTC.
Article updated at 21:14 UTC.

January 30, 2015February 5, 2015

Bárðarbunga volcano update for 30-January-2015

Since last update nothing major has changed in Holuhraun. There have been some changes in Bárðarbunga volcano it self and I am going to cover that later in this article. The magma flow from the craters in Holuhraun remains high at the moment, with latest flow measurements saying that flow of lava is now 100m³/sec. There seems to be uncertain or maybe changes in the flow of lava out of the crater. The volume is now ~1,4 km³. The lava-field has been getting thicker over the past weeks and closest to the craters it is now around 40 meters thick. New estimate of when the eruption might end are now 4 to 15 months.

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

Earthquake activity remains high, but it continues to drop at steady rate between weeks. Earthquake activity now also drops between peaks in activity. I still don’t know if a small eruption took place in Bárðarbunga volcano. Nothing has yet been confirmed and it might remain unconfirmed for a long time. I am also seeing small spikes in the harmonic tremor data due to hydrothermal activity in Bárðarbunga volcano (far as I can tell).

If anything major happens I am going to post update about it soon as I can.

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January 30, 2015January 30, 2015

Possible minor eruption in Bárðarbunga volcano caldera

It appears that at 21:22 UTC (on 29-January-2015) a possible minor eruption might have taken place somewhere along the Bárðarbunga volcano caldera rim or in it slopes. I don’t have any confirmation yet, but this is what the tremor data suggest at the moment. This minor eruption appears to have lasted around 30 – 55 minutes in total. If there was an high amount of glacier melt the glacier water is going to start appearing in Jökulsá á fjöllum or other glacier rivers that come from Vatnajökull in next 8 – 18 hours. Depending on the router the water takes. I don’t know where it is going to go, but the highest chance is that it is going to appear in Jökulsá á fjöllum glacier river. This minor eruption was followed by a minor earthquake swarm, the largest earthquake in that swarm had the magnitude of ~4,5 according to automatic results.

The earthquake activity that followed this harmonic tremor (the red dots). Copyright of this image belongs to Icelandic Met Office.

The harmonic tremor spike can be seen on Dynjuháls SIL station at the end of the blue line, where it spikes up. Copyright of this image belongs to Icelandic Met Office.

The harmonic tremor spike as it appears on the SIL station on Skrokkalda. The spike is clear based on other activity that appears clearly on this SIL station (earthquakes). Copyright of this image belongs to Icelandic Met Office.

High resolution image of the harmonic tremor on Dyngjuháls SIL station. This is the signature of eruption under the glacier. Even if it was just a small one. Copyright of this image belongs to Icelandic Met Office.

If anything more happens I am going to post update soon as possible. I am going to write about the earthquake swarm on the Reykjanes Ridge tomorrow.

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