Earthquake with magnitude Mw3,6 in Grímsfjall volcano, no eruption yet

I’ve been trying to wait for information about the activity in Grímsfjall volcano. A new cauldron was discovered yesterday (05-December-2021). It is possible that an small eruption took place in the side of Grímsfjall volcano and didn’t break the glacier. It might have been a short eruption if that is what happened. Harmonic tremor data is unclear on this so I can’t give any good answer. At 06:16 UTC an earthquake with magnitude of Mw3,6 took place. I poorly recorded it my seismometer and it seems to have been a low period earthquake. Suggesting that a magma pushing up was the reason this earthquake happened.
Continue reading “Earthquake with magnitude Mw3,6 in Grímsfjall volcano, no eruption yet”

Deep earthquakes in Fagradalsfjall mountain

Today (21-July-2021) few deep earthquakes took place in Fagradalsfjall mountain that is part of Krýsuvík-Trölladyngja volcano system.

This earthquake activity was not big and the largest magnitude recorded was a magnitude of Mw0,8. Most depth that appeared had a depth of 13,4km.

Earthquake activity in Fagradalsfjalli mountain shown by a red dot, orange dots and few blue dots on Reykjanes peninsula.
The earthquake activity in Fagradalsfjall mountain on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.

It is difficult to know what this means. What is possibly happening is that more magma is pushing up in the magma feeding that now exist where the eruption has been happening. If that is happening, it can result in new craters or fissure opening up and start erupting. At the writing of this article this earthquake activity seems to be ongoing, but at slow rate and small earthquakes only so far.

Fog continues to block view to the crater and Fagradalsfjall mountain. But harmonic tremor data shows that the Fagradalsfjall mountain eruption is currently not erupting.

Update on the eruption in Fagradalsfjall mountain on 30-April-2021

This is a short update on the eruption in Fagradalsfjall mountain on 30-April-2021.

There has not been any major changes since last update. This are the noticeable changes since last update in the eruption in Krýsuvík-Trölladyngja volcano system.

  • Just one crater is now erupting. All other craters have stopped erupting but for now some of them might contain lava lake for now that might be creating a flow in lava tubes under the surface in the lava field. This process might not be visible on the surface.
  • A lot of activity now is in form of high lava arcs (correct word?) are now being formed in the one crater because of increased gas content of the lava.
  • Lava fields are slowly filling up all nearby valleys that it is flowing into. This is a slow process and is going to take months.
  • There are no signs the eruption is about to end.

No other updates have been reported so far. Rúv has installed a new web camera to give better view of the eruption. That camera can be found on YouTube Rúv channel.

Vacation

I am going on a small vacation between 5th May and 10th May. That means next update about the eruption is going to be on 14th May. I don’t know if I can go to the eruption yet as that depends on the weather and the weather is always unstable in Iceland.

Update on the eruption in Fagradalsfjalli mountain on 23-April-2021

This is a short update on the eruption in Fagradalsfjall mountain on 23-April-2021 for the last week. Information is provided with best effort. The volcano that is erupting is Krýsuvík-Trölladyngja volcano system.

No major changes have been seen this week in the eruption. Here are the highlights.

  • According to last chemical analyse of the lava. The magma that is coming up is getting more primitive and from deeper part of the mantle. This increased the chance that the eruption is going to go on for months to years. Details can be found here on Twitter or here on Facebook.
  • Thickness of the lava is in most places just 16 meters. In Geldingadalur valley the thickness is at most 50 meters and getting thicker as the eruption continues and the valley slowly fills up. The lava doesn’t flow far and so it piles up next to the erupting craters.
  • At the writing of this article it seems that crater 1 is slowing down or shutting down. There seems to be some activity but it is low and mostly just gas is blowing out.
  • Craters continue to collapse as the eruption goes on. This happens at random and results in flood of lava happening.
  • The most active area now is the craters that opened on 7th of April and other time after that.

Other than this the eruption continues to be stable and the flow of lava is around 5m2/second according to last report I did read in the news.

Update on the eruption in Fagradalsfjall mountain on 19-April-2021

This is a short update on the eruption in Fagradalsfjall mountain that is part of Krýsuvík-Trölladyngja volcano system.

  • The crater that started erupting on 5-April-2021 has stopped erupting. I am unclear when it stopped erupting but that must have happened sometimes in last few days.
  • Smaller vents have opened up but none of them have been able to create any major eruption crater. Most of those have also stopped erupting and been buried by fresh lava from others craters when they stopped erupting.
  • Earthquake activity has been appearing along the dyke in last few hours. I am unclear what that means at the writing of this article.
  • New fissures with steam or hot air have been reported south of current eruption. I am unclear where they are located. There don’t appear to be any new fissures north of the crater that has stopped erupting at the writing of this article.
  • Crater 1 has now started to smoke a lot. While the second vent continues to erupt a smaller eruption. I am unclear on why one of the vent is smoking as it has been doing for the last few days.
  • The eruption is now 1 month old today. The eruption started on 19-March-2021.
  • Amount of lava being erupted has increased since the start of the eruption according to latest reports.

I don’t have any more reports today but that might change without warning. If that happens. I am going to write an article soon as I can.

Stronger harmonic tremor reported in Fagradalsfjall mountain eruption

Yesterday (15-April-2021) it was reported (late) that harmonic tremor seems to have been increasing in the eruption since midnight. This normally happens if new craters have opened up. The weather is really bad at the eruption site currently so viewing the eruption with any web camera is difficult if not impossible. Rúv web cameras failed last night because of the weather that has been seeing wind peaks up to 41 meter/second with heavy rain. Current weather forecast is that the weather is not going to start improving until late today (Friday 16-April-2021). The increased tremor might be weather but weather is in general easy to filter out and doesn’t affect the lower bands (0.5 – 1Hz) that much as it does higher bands (2 – 4hz). What is happening won’t be clear until the weather starts getting better.

Information about the volcano Krýsuvík.

News and web cameras that might work

Órói auk­ist en aðstæður óljós­ar (mbl.is, Icelandic)
Gosið í Geld­inga­döl­um í beinni (web camera, mbl.is) – The fog cover sometimes breaks a little on this web camera.

Long eruption is now expected in Fagradalsfjall in Geldingadalir valley (soon a former valley) based on lava chemical details

This is not a update on the eruption. There has not been any major change in the eruption at the writing of this article.

University of Iceland has released a report that can be read here (pdf) showing that the magma that is now erupting comes from the depth of 17 to 20 km. Crust at this location on the Reykjanes peninsula is around 17 km deep. A 3D map can be found here of the eruption. I think it is going to updated regularly by ÍSOR. The lava that is now erupting is part of Tholeiitic magma (Wikipedia). The lava is 1180C when it erupts from the ground.

What seems to be now happening is that a shield volcano is forming. It is a question if this is going to result in a formation of new magma chambers along the dyke where it formed. There is continued risk that new vents and fissures eruptions opens in this change can happen without warning. Based on earthquake activity it seems that the dyke continues to be active rather than having turned into rock by cooling.

The eruption is also high in the following gases, CO (Carbon monoxide), CO2 (Carbon dioxide), SO2 (Sulfur dioxide) and other dangerous gases.

It is now estimated that the Geldingadalir valley is going to overflow in 8 to 18 days and currently a lava pond is forming at this location. Once that happens the lava is going to flow into nearby valley (I can’t find the name of it). One of the valley the lava is in the end going to flow into Nátthagi valley if the eruption lasts long enough.

Update on the eruption in Geldingadalur on 22-March-2021

This is a short article about the eruption in Geldingadalur. The volcano that is erupting continues to be Krýsuvík-Trölladyngja volcano system. This might change at later date. This article is written on 22-March-2021 at 17:30 UTC.

  • The eruption is now mostly just in one crater. There is some activity in two other craters but it seems to be getting smaller as the eruption goes on.
  • This eruption is tiny and one of the smallest eruption observed in Iceland.
  • There is risk of new eruption opening up once this eruption ends or starts to get close to ending.
  • There is a fissure in the ground on the right side of the main crater (as seen on the web camera). A lot of volcanic gas comes from that fissure but no eruption has taken place so far.
  • There has not been any noticeable deflation according to GPS data from today (22-March-2021).
  • The main crater is now estimated to be 30 meters high but it is unstable and collapses often.
  • The lava is estimated going to fill Geldingadalur valley in 10 to 14 days if the eruption continues this long.
  • Earthquake activity has almost stopped on Reykjanes peninsula after the eruption started. Once the eruption stops earthquake activity might increase again.

 

The Geldingadalur valley seen from above with Google Earth. Small valley with small mountains on most sides.
This is a image from Google Earth and shows Geldingadalur valley that is now being filled slowly with lava. Copyright of this image belongs to Google Earth/Google and other companies that Google has made this image available with its Google Earth program.

The last eruption period on Reykjanes peninsula lasted from the ~700 to the year ~1400. It can be estimated that current eruption period that has now started on Reykjanes peninsula is going to last until the year ~2400 to the year ~2600. During this time shortest time between eruptions is 1 year but the longest time between eruptions might be up to 10 years. How this going to be exactly is a big question but this estimate of mine is based on the limited historical data that I have read somewhere (I no longer remember where that was).

News items with videos

Tower breaks again, lava gushes forth (Rúv.is)

Web cameras now with English text

Live feed from Iceland volcano (Rúv.is)
Live from Geldingadalir volcano, Iceland (YouTube)

Rúv has moved the stream to YouTube only.

Beint: Eld­gosið í Fagra­dals­fjalli (mbl.is, this camera is on the other side compared to the Rúv camera)

Update at 23:57 UTC

According to the evening news on Rúv the lava and magma that is now flowing into the valley of Geldingadalur is around 1200C and is a primitive magma of Tholeiitic magma series (Wikipedia). The source of this eruption is a magma chamber with the depths of 17 km to 20 km and the origins of the magma it self is far deeper into the hotspot below Iceland. This magma has a lot of CO and CO2 gases that are highly dangerous. There is also a lot of SO2 gas in the eruption and that is dangerous gas.

News in Icelandic about this

Hraunkvikan sýnir beintengingu við miðju möttulsins

Rate of updates

Since the eruption is now in stable activity I am going to limit update to if anything major happens. Next update about the eruption should be on Friday 26-March-2021. Other activity in Iceland is going to be reported as normal if anything happens.

Donation

Please remember to support my work with donations. Google Adsense remains limited on my website and I don’t know when it might get back to normal. Thanks for the support. 🙂

Article updated at 18:32 UTC. New web camera added.
Article updated at 20:50 UTC. Web camera information updated.
Article updated at 23:57 UTC. Information added about the eruption.

Update on Geldingadalur in Fagradalsfjall mountain eruption on 21-March-2021

This information is going to get outdated quickly. This article covers Krýsuvík-Trölladyngja volcano. This article is written on 21-March-2021 at at 00:40 UTC.

  • This eruption is tiny. The amount of magma erupted is now around 0.02km3 but this number might not be fully accurate since I’ve not seen any published number about of volume of lava erupted so far.
  • This is unconfirmed but it is possible that an new fissure opened up under the lava field next to the hill side (seen on the web camera, this is on the left side).
  • The current erupting fissure is now about 200 meters long and might be getting shorter.
  • Earthquake activity has almost stopped at the writing of this article.
  • This eruption might only last 1 to 3 days before it stops.
  • There is no sign of deflation in the GPS data at the writing of this article.

There are no other reports about this eruption at current time. This might change without warning.

Web cameras

Beint vefstreymi frá eldstöðvunum – Rúv.is – Live from the eruption.

Beint vefstreymi af eldgosinu – Vogastapi (Rúv.is) – Added 22-March-2021. View from a distance. Should show a red glow from the eruption if the weather isn’t too bad. – This web camera is no longer active!

Update at 15:28 UTC – One side of the main crater collapses

Here is a video of the main crater collapse on one side and give lava a new path for short period of time. At the writing of this update that path for the lava has closed down again.

Gígbarmurinn gefur sig og ný hraunrennslisæð myndast (Rúv.is)

Update at 21:21 UTC

Kvikustreymið braut sér nýja leið (Rúv.is) – This is a new video of the crater collapse that took place at 14:20 today (21-March-2021).

Article updated at 15:29 UTC. New information added.
Article updated at 21:21 UTC. New information added.
Article updated at 03:06 UTC on 22-March-2021. Web camera added.
em>Article updated at 16:34 UTC on 22-March-2021. Web camera has been removed by Rúv – comment added to that web camera.

Overview of the eruption in Geldingadalur in Fagradalsfjall mountain

This is a short overview of the eruption that is now ongoing in Geldingadalur in Fagradalsfjall mountain area. This is part of Krýsuvík-Trölladyngja volcano system according to latest information. This information might change as the time and more information is collected. This article is written on 20-March-2021 at 02:58 UTC.

  • This is the first eruption in Krýsuvík-Trölladyngja volcano system since the year 1340.
  • The eruption started at 20:45 UTC according to Icelandic Met Office.  The harmonic tremor from the eruption is almost invisible.
  • The fissure is at the writing of this article estimated about to be 1 km long with the direction south-west and north-east.
  • Currently the eruption is small and there is no risk of damage to any infrastructure. Next road (currently closed because of earthquake damage) that might get damaged is 2,5 km distance from the eruption site.
  • This eruption suggests that more eruption might start in different fissures once this eruption is over.
  • The valley that the lava is flowing into might get filled with lava if the eruption lasts long enough. The valley next to it is equally deep so there is no danger of this lava flow.
  • The eruption is in a area that is difficult to access even by a car.

 

The earthquake activity in the dyke between Fagradalsfjalls and Keili. Mostly just minor eartquakes show by red dots
The earthquake activity in the dyke. Copyright of this image belongs to Icelandic Met Office.

The eruption might only last for two to three days as it currently looks but that might change without warning since it is impossible to know for sure what is going to happen next with this eruption.

There are no good web cameras of this eruption since it is remote and started late on Friday night and the weather on Reykjanes peninsula is not good for today (20-March) or tomorrow (21-March).

Updated at 04:49 UTC. Web cameras added to this article.

Rúv – Beint vefstreymi af eldgosinu – Vogastapi
Beint vefstreymi frá eldstöðvunum – Rúv.is – New! This web camera is closest to the eruption.
Road camera 1
Live from Iceland – Keilir
Live from Iceland – Reykjanes

Article updated at 03:49 UTC. Information added. Spell check fixes.
Article updated at 04:52 UTC. Web cameras added.
Article updated at 14:44 UTC. New web camera added from Rúv.