Fagradalsfjall volcano has no document eruption history over the last 10.000 years and the main volcano location is unknown if it exists.
Updates from the last few hours
Small rift valley has started to form between Keili mountain and Fagradalsfjall mountain. This is part of the rift zone that is Reykjanes peninsula.
Harmonic tremor stopped this morning and as Icelandic Met Office has been telling the news the origins of this harmonic tremor was earthquake activity that was so dense it created this harmonic activity. In the morning the activity dropped a little.
Magma continues to move in the Fagradalsfjall volcano system.
Earthquake activity is now between the volcanoes Reykjanes, Fagradalsfjalls and Krýsuvík. Why that is unclear but magma movement for now is only in Fagrdalsfjall volcano system.
Largest earthquake in last 24 hours had a magnitude of Mw4,5. Over the last 48 hours total of 72 earthquakes with magnitude over Mw3,0 have taken place. There is no sign of activity slowing down.
It is currently impossible to know for sure what happens next since this situation is extremely complicated because of all the volcanoes interactions and earthquake activity.
There has not been a lot of change in the earthquake activity in Reykjanes volcano. There has been a slight increase in earthquake activity compared to yesterday (28-Febrary-2021) but that increase is not a lot and only from 800 earthquakes to 1000 earthquakes for a 12 hour time period according to the news. Largest earthquake in last 24 hours had a magnitude of Mw4,9 and was felt over a wide area in West Iceland and was clearly felt in Reykjanes area.
There have now been two earthquakes outside Reykjanestá out in the ocean. A swarm of earthquakes started to appear at that location few hours ago. It is unclear what this earthquake activity means for now. This earthquake activity is something that needs to be watched since it seems to be connected for some unknown reason to the main earthquake activity on Reykjanes peninsula.
Update at 16:57 UTC
The newest earthquake has the magnitude of Mw5,1 at 16:35 UTC. This earthquake was felt over a wide area in western Iceland and all over Reykjanes peninsula.
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Article updated at 16:58 UTC.
Article updated at 23:35 UTC.
I have now switched to daily update for the earthquake swarm in Reykjanes and Krýsuvík volcanoes.
The situation in the earthquake swarm on Reykjanes peninsula in the volcanoes Reykjanes and Krýsuvík remains the same. During the last 24 hours the largest earthquakes have had magnitude of Mw4,7 and a lot of earthquakes with magnitudes above M3,0. No magma movement has been detected so far but University of Iceland – Earth science department warned that detection of magma is only limited to the first 5 km of Earth crust and any magma movement below 5 km might not be detected by seismometer. It also issued that signs of magma might be getting lost in all this earthquake activity that is currently taking place and no clear sign of magma have been detected. The whole thing can be read on Facebook here. Text in English is provided by Eldfjallafræði og náttúruvárhópur Háskóla Íslands about this.
Some of the earthquake activity has migrated closer to the mountain Keilir. Other earthquake activity appears to be located at the same place as before. That location is close to Fagradalsfjall mountain and Krýsuvík volcano. If that changes anything when it comes to this earthquake activity I don’t know but the risk is there. Icelandic Met Office is now hoping that the earthquake swarm ends next week.
If anything major happens I’ll post new article soon as possible.
Largest earthquake in the last 24 hour had a magnitude of Mw5,2 at 08:17 UTC and this earthquake was felt over a wide area in west Iceland. Over the last 48 hours there have been 95 earthquakes with magnitude above Mw3,0. GPS is showing a lot of displacement and those information can be found here. Largest displacement has been in and around Krýsuvík and other GPS stations on Reykjanes peninsula.
Cracks have also formed in one road and other surface damage and other small damages have started to appear in buildings and roads on Reykjanes peninsula. There is going to be a storm in Iceland until early 2-March-2021. This storm is going to reduce the detection of smaller earthquakes in this earthquake swarm while it goes over Iceland.
All this information can change without warning.
News about cracks in the road on Reykjanes peninsula
This is a short update on activity in Reykjanes and Krýsuvík volcanoes. This update is written at 19:28 UTC.
The activity today (25-February-2021) has been mostly just minor earthquakes. Largest earthquakes today had a magnitude of Mw3,5 but this number can still change. In the last 24 hours over 2500 earthquakes have been recorded by Icelandic Met Office according to the news.
Steam has been confirmed close the parking lot close to Keilir mountain on Reykjanes peninsula. This area did not have steam before the Mw5,7 earthquake yesterday (24-February). It is unclear that is going on in that location. There continues to be high risk for a earthquake with magnitude Mw6,0 to Mw6,8 on Reykjanes peninsula because of this earthquake activity.
I’ll post update soon as possible if anything happens.
This is a short update at 21:19 UTC about the earthquake activity in volcanoes Reykjanes and Krýsuvík.
Earthquake activity slowed little since last update at 14:41 UTC. There are now fewer larger earthquakes taking place at the writing of this article. That has the chance of changing without warning. There seems to be new areas of activity appearing on the automatic Icelandic Met Office map. It is unclear if this is a artifact of the heavy earthquake activity in the area or a real thing is difficult to know for sure at the writing of this article.
Currently there are no signs of magma moving in both volcano systems. That might change without warning if there is a sudden change in activity. Because of how long it has been since last eruption took place in both volcanoes what happens before an eruption is unclear. What is only known from around 681 year old historical records that did survive to this day is that earthquake activity increases sharply before an eruption and does so a good while before the first eruption happens. Last eruption in Krýsuvík volcano was in the year 1340.
I am going to post next update tomorrow (25-February-2021) unless something major happens and then I’ll post a new article soon as possible.
According to new pictures from Icelandic Coast Guard. Steam has been seen from the area that had the strongest earthquakes this morning. This seems to be in a area that did not have an earlier any steam activity, this however depends a confirmation.
Icelandic News about the steam activity that has been detected.
This is a short update at 12:28 UTC on the earthquake swarm on Reykjanes peninsula and in Reykjanes volcano.
It is possible to see the earthquakes in my webicorder website here. This website is on limited bandwidth so it might load slowly if there is a lot of traffic to it. I am also self hosting it because of software requirement.
Largest earthquake in this swarm had a magnitude of Mw5,7 and was felt over most of Western Iceland. Minor damage has been reported in Reykjavík but it has been limited to stuff falling off shelves, walls and other such locations.
I am going to post updates as I know more about this earthquake activity. The reason why I am a bit late on this is that I was sleeping and I didn’t wake up with earthquake activity.
The earthquake swarm that started more than one year ago in Reykjanes volcano continues to be ongoing. Largest earthquake on 11-February 2021 at 07:56 UTC had the magnitude of Mw3,0. Other earthquakes had smaller magnitude as has been ongoing since 20-January-2020.
Since this magma activity in Reykjanes volcano started around 20-January 2020 there has been ongoing earthquake activity in this area. I don’t expect this to stop. When a eruption is going to happen is not something that is possible to know. Currently GPS data does not show any interesting change and doesn’t suggest anything is about to happen.
On Friday 22-January-2021 an earthquake swarm took place just east of Grindavík town. This earthquake activity then stopped but resumed at midnight on Sunday 24-January-2021. All of the earthquakes where small in magnitude and only few did go above magnitude Mw1,0 in size.
The earthquake swarm that started on Sunday lasted for 12 hours according to Icelandic Met Office website. There is no change in GPS location data (can be viewed here) and there is no change in harmonic tremor. Currently there is a bad weather in Iceland preventing automatic detection of small earthquakes all over Iceland.
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