Update on the eruption in Fagradalsfjall mountain on 6-April-2021 (2nd update)

This is a short update and second update for 6-April-2021 for Fagradalsfjall mountain that is part of Krýsuvík-Trölladyngju volcano system.

  • During the night a new fissure was discovered between the new eruption and the old eruption. The fissure is about 150 meters long and there is hot air coming up from it.
  • There are reports of a new fissure north of the new eruption and land has been sinking down at that location. No other changes have been reported at the writing of this article.
  • The lava going down into Meradalir valley slows down once it is there because it cools down quickly once it is there. There is a lava river going down in the Meradalir valley and that lava is moving quickly.
  • It is now estimated that this is a start of a long volcano activity period on Reykjanes peninsula that is going to last for centuries with breaks of 10 to 20 years between active periods of 30 to 50 years.

The situation is currently changes often during the day and the night and the risk of a new eruptions starting without any warning is now extremely high.


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Deep earthquake activity south-east of Katla volcano

Yesterday (5-April-2021) from 17:12 UTC until 17:36 UTC. This where all smaller earthquakes and according to Icelandic Met Office (Kristín on twitter) this area last had this earthquake swarm in this area eight years ago just south-east of Katla volcano.

Mýrdalsjökull glacier that contains Katla volcano. Just south east of Katla volcano a small cluster of  earthquake appeared at great depth in the crust
The earthquake activity south-east of Katla volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity at this location has never resulted in an volcanic eruption in this location during historical times. The depth of this earthquakes was mostly around 19 km and magnitude was from Mw0,7 to Mw1,0.

Earthquake activity in Öræfajökull volcano

On Sunday (4-April-2021) a small of small earthquakes took place in Öræfajökull volcano. Most of the earthquakes that happened where deep, with most depth at 11,3 km.

Blue dots showing earthquake activity in Öræfajökull volcano. The blue dots are on top of each other.
Earthquake activity in Öræfajökull volcano. Copyright of this image belongs to Icelandic Met Office.

It is unclear if this means anything at this point. Earthquake activity in Öræfajökull volcano at this point has been slow to start and happens without much warning as is. This might be an early sign that more activity is ahead in Öræfajökull volcano but only time is going to make it clear if that is the case.

Update on the eruption in Fagradalsfjall (including Geldingadalir valley) on 6-April-2021

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

There has been a slight increase in micro-earthquake activity along the dyke after the new fissures opened up in Fagradalsfjall mountain. Most of them are interestingly forced on a area close to Keilir mountain.

Earthquake activity on the Reykjanes peninsula many earthquakes form a direct line with the magma dyke that formed in February and March. Few red dots close to Keilir mountain
The earthquake activity on the Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.
  • It has been reported that lava flow from the new and old eruption site is now more than what was most at the old eruption site (Geldingadalir valley). It is now estimated to be total 10m3/second.
  • Craters are building up at the new eruption site. That might change the lava flow long term and there is a risk that it is going to flow towards Geldingadalir valley when that change in lava flow happens.
  • There is a high risk of new fissures opening up both north and south of Geldingadalir valley (1st eruption) and north of Fagradalsfjall mountain eruption (2nd eruption).
  • Lava is now flowing into Meradalir valley. That valley is far larger then Geldingadalir valley and won’t be filled up easily. There seems to be more water in this valley and that might result in lava explosions if the lava gets that far down into the valley.

Currently there are no other new information that I can find. Next update should be on Friday 9th April 2021 unless something major happens.