Eruption on Iceland's Reykjanes Peninsula 2021: activity updates

Обновленный: 14 авг 2022 22:01 GMT - Обновить

Fagradalsfjall volcano (Reykjanes Peninsula, Iceland): volcanic-seismic crisis continues to evolve, earthquake M 5.4 yesterday

Mon, 1 Aug 2022, 07:43
07:43 AM | ПЇЅПЇЅПЇЅПЇЅПЇЅ: MARTIN
Earthquakes at Reykjanes Peninsula in the last 48 hours (image: IMO)
Earthquakes at Reykjanes Peninsula in the last 48 hours (image: IMO)
The seismic record of the area (image: IMO)
The seismic record of the area (image: IMO)
Depth vs. magnitude during 25 Jul - 2 Aug (image: Volcano Discovery)
Depth vs. magnitude during 25 Jul - 2 Aug (image: Volcano Discovery)
The seismic activity remains elevated and had been more frequent.
Nearly 3000 earthquakes in total have been detected since the phase began by the Norwegian Meteorological Agency, of which four were recorded with magnitude of 4 and more.
The first earthquakes depths measurements were located at approx. 5-8 km depth, but since 18:00 local time on 30 July have become shallower at depth of about 2-5 km.
At 17:47 local time yesterday, seismic instruments registered the strongest event so far with magnitude M 5.4 located northeast of Grindavík. Shakes were even visible in the live stream (see the attached M 5.4 quake video below). The earthquake was widely felt by inhabitants, some minor damages reported.
Magma continues to intrude under the surface and causes voltage changes NE of Grindavík and west of Kleifarvatn lake.
A similar scenario occurred in December last year, but doesn't seem to be powerful enough to trigger an eruption yet.
Source: Icelandic Meteorological Office volcano activity update 1 August 2022

Fagradalsfjall volcano (Reykjanes Peninsula, Iceland): intense seismic activity, alert level raised to Yellow

Sat, 30 Jul 2022, 20:46
20:46 PM | ПЇЅПЇЅПЇЅПЇЅПЇЅ: MARTIN
Distribution of quakes in Fagradalsfjall volcano area this afternoon (image: IMO)
Distribution of quakes in Fagradalsfjall volcano area this afternoon (image: IMO)
An intense swarm of earthquakes has been occurring at Reykjanes peninsula, starting at noon today.
A series of earthquakes have been located northeast of Fagradalsfjall, of which the strongest one was measured with magnitude M 4.0 at 14:03 local time.
Earthquakes were located at depths between 5 and 7 km and are arranged in a northeast-southwest trending linear area. Quakes likely reflect magma intrusion shifting under the surface at shallow level.
Therefore, the Icelandic Meteorological Office (IMO) and authorities raised the alert status to "yellow".
The current hazard poses an increased risk of rockfalls in the area caused by stronger earthquakes. People are advised to avoid steep slopes, cliffs and areas prone collapse.
Source: Icelandic Meteorological Office volcano activity update 30 July 2022

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.
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