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

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

  • The eruption continues its strange cycle of not erupting for few hours and erupting for few hours.
  • The consequence of this type of eruption is that the lava doesn’t flow that far from the crater. It just piles up next to the crater making the structure ever higher. I am currently estimating (this is a guess and might be wrong) the crater at 200 meters high (-+ 50 meters).
  • The eruption has now been going on for five months. Holuhraun eruption in Bárðarbunga volcano in 2014 to 2015 lasted for six months.
  • At the writing of this article there are no new craters open but it doesn’t rule out that new crater might have opened but are hidden under the amount of lava that is around the main crater. As there are some extreme large caves in this lava field. Allowing for a lot of space for new crater to form and start erupting unnoticed.

There are no more updates of the eruption at the writing of this article. That might change without warning but I don’t know if that is going to happen.

Update on the eruption in Fagradalsfjall mountain on 10-August-2021

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

  • The eruption continues as before with few hours of eruption and few hours of no activity. (This is my personal view of the situation) Each event is an active eruption as it would happen with any other volcano. The time between eruptions now is just shorter than in any volcano in Iceland. Its hours, not decades between eruption. I don’t know why this is happening like this.
  • Cracks have appeared in the viewing area hill closest to the erupting crater. Why this is happening is unclear. There are two explanations for this. The first one is that this are tension cracks because of the eruption and lava flows nearby to this hill . The second explanation is that this is deformation cracks because magma is about to start erupting in this part of the hill. Formation of new cracks was observed early on in the eruption in Fagradalsfjall mountain few days before an eruption started in that area.
  • There is now slightly less lava flowing from the crater. Current flow is up to 9m3/sec according to latest reports about the lava flow. This studies are done by Earth Science of University of Iceland and Icelandic Metrology Office.

This eruption remains small. Currently it is even smaller than Hekla volcano 2000 eruption that was the smallest eruption in Hekla in recorded history (according to the news). While the eruption remains this small the lava is not going to flow far or is going to do so slowly. Most of the lava is just going to build up next to the crater and next nearby area.

People continue to walk out in the lava and that is extremely dangerous. The lava field, where it is deep enough has large caves full of 1100C hot lava and if the roof breaks and people fall into it there is no saving anyone from this. Just break in the lava field crust allows for lava flows to break out with same deadly consequences.

Unconfirmed report about ash cloud off the coast of Krýsuvík-Trölladyngja volcano (Krísuvíkurberg)

This is possible mistaken reporting. There have been reporting of ash clouds or steam clouds off the coast during the evening of 7-August-2021. This would be in the volcano system Krýsuvík-Trölladyngja.

The ash cloud or steam cloud would indicate an activity off the coastline or possible eruption activity in the ocean. Explosive events like that appear a lot more clearly as harmonic tremor on SIL stations and according to news reports nothing has been seen so far in the harmonic tremor data. There have been no earthquake activity in the area where the clouds are supposed to have been seen.

The coast guard has been sent to this area, as they where nearby anyway. I don’t know if anything has been reported so far. The weather is fine in south Iceland and I don’t think there is a lot of ocean waves, but as this is the Atlantic ocean there can be ocean waves even if there is no wind, since the ocean waves can arrive from parts of the ocean with bad weather thousands of kilometres away.

If anything new is reported I am going to update this article or write a new one.