Update on activity in Fagradalsfjall and Reykjanes volcanoes

This is a short update on what is going on in Reykjanes peninsula. This article is written at 16:29 UTC.

Volcanoes in this article

Fagradalsfjall
Reykjanes
Krýsuvík

  • Fagradalsfjall volcano has not erupted since Pleistocene. When last eruption took place is not listed or not known. This the first magma movement in Fagradalsfjall volcano in 11700 years.
  • Eruption risk is now in Reykjanes volcano*.
  • *This might also be a different volcano known as Svartsengi (no Global Volcanism Profile). There is no agreements between maps on this detail for now. Reykjanes volcano might only extend into Reykjanestá and then is mostly under ocean and might not extend into Reykjanes peninsula as sometimes is shown on maps.
  • Krýsuvík volcano has quieted down a little in the last 24 hours. Eruption risk is lower for now in that volcano.
  • Largest number of earthquakes detected in one day was over 3000 earthquakes.
  • In the last 24 hours 12 earthquakes with magnitude above Mw3,0 have happened. Most of them are felt in nearby populated areas.
  • No harmonic tremor has been detected since it ended during the night on 4-March-2021.
  • During the last 48 hours over 3300 earthquakes have been recorded by Icelandic Met Office.
  • New! Magma is now estimated to be at 5 to 6 km depth but might be as shallow as 2 km depth.

 

Dense earthquake activity in the volcanoes Reykjanes, Fagradalsfjall and Krýsuvík volcanoes
Heavy earthquake activity on Reykjanes peninsula in three volcanoes. Copyright of this image belongs to Icelandic Met Office.

Maps of possible eruption areas has been made by Earth science department of University of Iceland and can be found here. University of Iceland Earth science department also made a lava flow prediction can that map can be found here. Both maps are updated daily on Facebook.

Web cameras

Beint vefstreymi af skjálftasvæðinu – Vogastapi (Rúv.is)
Keilir í beinni (mbl.is)
Óróasvæðið í beinni útsendingu (Vísir.is)
Live from Iceland
Keilir og skjálftasvæðið (YouTube)

Added at 21:12 UTC

Road camera 1
Road camera 2 (night vision/infrared)

Cameras and links might go offline without warning.

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Article updated at 16:53 UTC.
Article updated at 21:13 UTC.

Krýsuvík volcano update at 19:56 UTC

This is a short update since this situation is developing quickly.

No eruption has started at the writing of this article. Harmonic tremor is slightly lower compared to when it started at 14:20 UTC in Krýsuvík volcano. This drop in harmonic tremor started around 16:00 UTC. This harmonic tremor is ongoing as for writing of this article. There are no signs of the rift valley formation on the surface yet, but it does show up on measurements, both GPS and satellite measurements. Earthquake activity is high at the writing of this article but most earthquakes are small in magnitude but there are few earthquakes with magnitude of Mw3,0.

Earthquake activity in Krýsuvík volcano. A lot of green stars and red dots showing new earthquakes.
Earthquake activity in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.
The earthquake trace shows a dense dots of blue, yellow, orange and red dots. All are earthquakes of different magnitude
Earthquake activity trace of the earthquake activity on Reykjanes peninsula. Most earthquakes are in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.

Web cameras of the possible eruption area can be found in this locations.

Beint vefstreymi af skjálftasvæðinu (Rúv.is)
YouTube stream.

I am going to add more streams as I find them online.

I’ll update soon as possible if anything happens. This situation is changing quickly.

Earthquake activity and more in Grímsfjall volcano (Grímsvötn)

Yesterday (29-January-2021) at 23:34 UTC an earthquake with magnitude of Mw2,4 took place in Grímsfjall volcano (Grímsvötn). There where few smaller earthquakes before and after this largest earthquake. There where no signs of change in harmonic tremor following this earthquake activity.

In the center of Vatnajökull glacier there is a volcano Grímsfjall. East of that a yellow dot shows the location of an earthquake with magnitude of Mw2,4. Grímsfjall volcano is marked by a triangle that shows the location of a seismic sensor to record earthquakes in this area.
Earthquake activity in Grímsfjall volcano. Copyright of this image belongs to Icelandic Met Office.

It has also been reported in the news that glacier plate that is on top of Grímsfjall volcano is now the highest since 1996. Inflation is now taking place in eastern part of Grímsfjall volcano, in a location called Eystri Svíahnúkur. Magma pressure is today (30-January-2021) equal or higher than when the May 2011 eruption took place in Grímsfjall volcano.

Sources / News in Icelandic

Íshellan í Grímsvötnum ekki mælst hærri í 25 ár (Icelandic, Rúv.is)
Fundur í vísindaráði almannavarna (Icelandic, Almannavarnir.is)

Swarm of small earthquakes in Reykjanes volcano

Today (11-November-2020) a swarm of small earthquakes took place north of Grindavík town in the Reykjanes volcano. This where all small earthquakes and largest earthquake had a magnitude of Mw1,7. At the writing of this article Icelandic Met Office website lists 76 earthquakes on Reykjanes peninsula.


The earthquake activity in the Reykjanes volcano. Copyright of this image belongs to Icelandic Met Office.

There is not a big change in the GPS data but there is a small change that suggests that Krýsuvík volcano has started to inflate more after the magnitude Mw5,6 earthquake. The GPS data can be viewed at University of Iceland GPS Reykjanes time series.

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Strong inflation detected in Reykjanes volcano after Mw5,6 earthquake

The earthquake on 20-October-2020 was followed by a strong inflation in Reykjanes volcano. Current levels of inflation are about ~50mm according to Icelandic Met Office and can be seen on GPS measurements in recent days (GPS time series for Reykjanes).


The inflation in Reykjanes volcano. I had to scale this image because of WordPress requirements. Full size image can be found here on Icelandic Met Office website. Red is more inflation, blue is deflation or lower areas. Copyright of this image belongs to Icelandic Met Office.

This inflation appears clearly on GPS stations that are closest to this area. The area where the most inflation is a small mountain called Keilir. Last eruption in this area was sometimes during last ice age. This inflation also explains the earthquake activity that has been going on in this area for the last few days as I have written earlier about.


Current earthquake activity on the Reykjanes peninsula. Detection of smaller earthquakes is lower because of bad weather in Iceland. Copyright of this image belongs to Icelandic Met Office.

As of the writing of this article I am expecting more earthquakes and more inflation to happen in this volcano and other close by areas. It is not possible to know when a eruption is going to happen in Reykjanes volcano.

Icelandic Met Office News

Significant ground deformation detected associated with recent earthquakes (en.vedur.is)

Earthquake swarm in the Reykjanes volcano

Over the last few hours there has been an earthquake swarm close to mountain called Fagradalsfjall in or close to the volcano called Reykjanes. At the writing of this article no earthquake with magnitude over Mw2,0 have happened. That might change without a warning.


The earthquake swarm in the volcano Reykjanes or close to it. Copyright of this image belongs to Icelandic Met Office.

Currently there isn’t anything suggesting that magma is on the move at the writing of this article. This earthquake swarm is something to watch out for since this might increase in size and magnitude over the next few hours. Inflation data from GPS measurements from this area are still unclear. There is also ongoing earthquake swarm north of Grindavík town but it has quieted down in last few hours.

Earthquake activity in Bárðarbunga volcano

Today (14-June-2020) an earthquake with a magnitude of Mw3,4 took place in Bárðarbunga volcano. This is now the regular and usual earthquake activity in Bárðarbunga volcano and is connected to inflation in the volcano after the 2014 – 2015 eruption in Holuhraun.


Earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is located normally either in the south-east part of the caldera or in the north-east part of the caldera. This earthquake was located in the south-east part of the caldera. More earthquake activity is going to happen in Bárðarbunga volcano in next few months to years and should not be a surprise to anyone.

Sharp increase in earthquakes in Þorbjörn mountain (Svartsengi/Reykjanes volcano)

Since around 06:00 this morning (13-June-2020) a sharp increase in earthquake activity took place north of Grindavík town. The most dense earthquake swarm was located west of the Blue lagoon with other minor swarms in other nearby areas. The active volcano is Reykjanes and Svartsengi (no Global Volcanism profile). Map can be found here and here (go to Höggunarkort).


The clusters of earthquake activity close to Grindavík town. This map can be found here (Icelandic only). Copyright of this image belongs to Icelandic Met Office.


Current earthquake activity close to Grindavík town. Copyright of this image belongs to Icelandic Met Office.

Largest earthquakes at the writing of this article have a magnitude of Mw3,5 (at 20:27 UTC) but since this earthquake swarm in ongoing that number can change without warning.

There was also considerable noise during the earthquake swarm earlier. Suggesting that something is going on but I do not know what might be for now. The noise results in the blue band thickens during the earthquake swarm.


The termor plot during the earthquake swarm. Copyright of this image belongs to Icelandic Met Office.

Current GPS data (can be viewed here) doesn’t show any major changes at the writing of this article. That might change in next few days.

Inflation resumes at Þorbjörn mountain on Reykjanes peninsula

According to Icelandic Met Office and news at Rúv.is the inflation at Þorbjörn mountain seems to have started again after few weeks of no inflation being detected. The inflation now seems to be small but that might change without warning. There might not be a lot of earthquake activity connected to this time of inflation because the area already is inflated and there was a lot of earthquake activity earlier in the year when this started. Earthquake activity might be more common on the edges and at those location the risk of magnitude Mw6,0 earthquake is highest, but is impossible to be certain about this due to how many faults there are on the Reykjanes peninsula, both from volcanoes and rift faults due to the rift valley that is there (its just full of lava).


There was a earthquake swarm yesterday (28-May-2020) north of Grindavík town. Copyright of this image belongs to Icelandic Met Office.

How this is going to change and evolve over the next few weeks is not something that can be predicted with any certainty for now. Since there have not been any eruption in this area for close to 800 years it is not known how this volcano systems behave in a eruption and inflation phase.

GPS data can be found here.

Icelandic News

Land virðist farið að rísa við Þorbjörn á ný (Rúv.is)
Vísbendingar um að landris sé hafið að nýju við Þorbjörn (Vísir.is)

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Please remember to support my work with donations. Thanks for the support. 🙂

I am going to start working I hope next week in order to increase my income and making things easier for me when it comes to money from July to September. This means slightly less time to update this website if anything happens during the work day.

Strong earthquake in Bárðarbunga volcano during the night

During the night of 20-April 2020 a magnitude Mw4,8 earthquake took place in Bárðarbunga volcano. This activity is normal and this is the strongest earthquake in Bárðarbunga volcano since January 2020 when a magnitude Mw4,8 earthquake took place. Article on that earthquake can be found here.


The earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This is how the earthquake was recorded on my geophones.


The earthquake on my first Hvammstangi geophone station.


The earthquake on my second Hvammstangi geophone station.

The traces show that there was a lot of ground displacement in this earthquake. This is due to the inflation taking place in Bárðarbunga volcano and the fact Bárðarbunga volcano collapsed during the 2014 – 2015 eruption in Holuhraun.

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Please remember to support my work with donations. It helps me to keep this website running and just to do everyday normal thing and not to go too broke. Thanks for the support. 🙂