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Eruption on Iceland's Reykjanes Peninsula 2021: activity updates

Mise à jour: 24 mai 2022 22:26 GMT - Refresh

magma likely won't reach surface as models indicate

Update Fri 07 Jan 2022 21:56
The estimated location of the new magma chamber (red line). The black line points out to the previous magma chamber (image: IMO)
The estimated location of the new magma chamber (red line). The black line points out to the previous magma chamber (image: IMO)
GPS instruments continue to detect a mild ground deformation, although the seismic activity at Reykjanes Peninsula continues at decreasing levels.
Numerical models indicate that a current flux of magma is less than half of the pre-eruptive magma volume that started in March.
It is unclear whether the magma batch will reach the surface as happened in March.
The most likely scenario, according to models and the latest measurements, is that the magma may start to solidify in dikes sooner than reach the ground.
"Scientists have pointed out a comparison between the activity at Fagradalsfjall and the activity seen in the Krafla fires", says Michelle Parks, an expert at the Icelandic Meteorological Office. "In the Krafla fires, about half of the magma intrusions ended with an eruption and the other did not and we could see examples of such activity at Fagradalsfjall. It affects how big the magma intrusions are and how shallow they reach", says Michelle.
Source: Icelandic Meteorological Office volcano activity update 7 January 2022

seismicity continues at reduced levels

Update Mon 03 Jan 2022 18:18
The seismic activity at Reykjanes Peninsula continues at decreasing levels.
About 200 earthquakes have been detected since midnight and have reduced both in numbers and frequency.
Source: Icelandic Meteorological Office volcano activity update 3 January 2022

activity slowed down as seismic swarm decreased

Update Thu 30 Dec 2021 18:41
The seismic activity continues with little changes as a number of earthquakes have been lower than in previous days.
1300 earthquakes have been detected on 28 December which is a lot less in compared with the previous day when 2300 quakes were detected.
A maximum magnitude of 3.7 occurred at 10:22 local time yesterday located east of Kleifarvatn ans was widely felt in the capital area.
GPS and InSAR measurements confirm that the flux of magma is limited to a dike intrusion which is very similar to the pre-eruptive pattern before the eruption started on 19 March.
Source: Icelandic Meteorological Office volcano activity update 30 December 2021


more and more frequent earthquakes reflect magma intrusion

Update Wed 29 Dec 2021 04:30
The seismic activity during 21-28 Dec on the Reykjanes peninsula (image: IMO)
The seismic activity during 21-28 Dec on the Reykjanes peninsula (image: IMO)
600 quakes have been detected since midnight, but have occurred at a lower number than yesterday at the same time.
A maximum magnitude of 3.6 occurred yesterday at 08:25 local time.
Magma migration at depth is still about to pressurize and the increase in the seismic activity is likely a sign of its accumulation.
19000 earthquakes have already been detected in total, mostly with magnitudes of 4 or more since the seismic crisis started on 21 December.

strong seismic activity continues

Update Tue 28 Dec 2021 00:28
The seismic activity during 21-26 Dec on the Reykjanes peninsula (image: IMO)
The seismic activity during 21-26 Dec on the Reykjanes peninsula (image: IMO)
The number of earthquakes rapidly increasing but the activity slowed down a bit over the past 24 hours.
18000 earthquakes have already been detected in total, mostly with magnitudes of 4 or more since the seismic crisis started on 21 December.
Strongest earthquakes occurred outside of a potentially eruption site yesterday.
People are advised to avoid the area due to risk of rockfalls.

continuing ground deformation has reached same pre-eruptive February values

Update Sun 26 Dec 2021 21:54
Ground deformation detected during 20-26 Dec (image: IMO)
Ground deformation detected during 20-26 Dec (image: IMO)
The seismicity continues at increasing levels.
Earthquakes have continues to pick up both in numbers and strength.
4 quakes on 24 December were recorded, of which 3 with magnitudes of 4 and 1 with a maximum magnitude of 4.8. 3000 earthquakes have been detected in total since the seismic crisis started on 21 December.
The activity has been intensifying and more frequent under the Fagradalsfjall volcano, but it also occurred near Grindavík and Kleifarvatn.
The latest interferogram measurements (InSAR) detected same pre-eruptive ground deformation (see attached image) as seen in late February reflecting continued magma intrusion and migration under the surface, supported also by continued deformation of the surface.
Source: Icelandic Meteorological Office volcano activity update 26 December 2021
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