Update on 5-August-2022 on the eruption in Meradalir valley

This is a short update because not much has changed in the last 24 hours in the eruption in Meradalir valley in Fagradalsfjall mountain.

  • The eruption is now in 120 meter long eruption fissure. Currently the output of the eruption is around 18 m3/sec according to yesterday’s measurements.
  • The new lava has now flowed over the lava from last year (2021) and into eastern Meradalir. This is about 1 km distance that river of lava has flowed.  Image of that can be found here on Facebook.
  • According to chemical analyse of the magma. This is the same magma that was erupting when the eruption in the older crater stopped erupting in September. This shows that this magma is older and the new magma has not yet reached the surface.
  • Fissures on the ground north-east of the eruption site have started to move and getting wider according to experts that are in the area. This strongly suggests that an eruption is about to happen soon in that location. When it starts is impossible to know. But this is going to close one way to the eruption and if eruption starts in new location south of the crater, seeing and viewing this eruption might start to get difficult or impossible, at least the part in Meradalir were the current eruption is happening now.

I think that is all for this Friday. Next update is going to be on Friday 12-August unless something major happens in this eruption and that might just happen.


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Update on the eruption in Fagradalsfjall on Saturday 17-July-2021

This is going to be shortest update to the eruption in Fagradalsfjall mountain that is part of Krýsuvík-Trölladyngja volcano system.

  • Since 9th July the eruption has been unstable. Between 10th July and 15th of July the eruption continued as before with pulsing activity.
  • On 15th of July at 05:00 the eruption stopped and it didn’t start again until around 10:00 on 16th of July.
  • At the writing of this article it seems that the eruption has stopped again based on the harmonic tremor.
  • The lava flows is down in Meradalir when the lava flow happens. At current rate it is going to take 1 to 4 weeks until Merdalir overflows with lava into next valley.
  • The east side of the crater has collapsed and that allows the lava flow direct flow down into Meradalir.

It is unclear why the eruption stops and starts again. One of my ideas is that the deep feeder system of the eruption is now empty and needs time to refill. The eruption stops when the feeder system is empty. The more empty it is the longer the eruption stops since it takes more time for the magma to fill up the magma chamber that seems to be there at 20km depth or more. How long this is going to go on I don’t know but I don’t think this can go on for many months or years. Current crater is at one point going to seal it self and the eruption is going to stop because of that.