quote:Grímsvötn volcano Aviation Color Code raised to Orange, Iceland
The Icelandic Met Office (IMO) has raised to Aviation Color Code for Grímsvötn volcano from Yellow to Orange on December 6, one day after the glacial flood from Grímsvötn reached its peak discharge. By definition, the Aviation Color Code is updated to Orange when a volcano shows increased activity and there is an increasing probability of an eruption.
The seismic activity at Grímsvötn has been increasing above the normal level over the last couple of days. A magnitude 2.3 earthquake was recorded near the volcano on December 6 followed at 06:10 UTC by a shallow M3.6 at the eastern summit caldera rim and several aftershocks of magnitude 1.1
This seismic activity is possibly occurring due to the decreased pressure above the volcano since the floodwater left Grímsvötn sub-glacial lake.
According to a GPS meter from the Meteorological Office in Grímsvötn, the ice cap has sunk about 77 m (252 feet) since subsidence started on November 24. The subsidence has slowed down a lot and the glacial flood has decreased, so it can be concluded that the lakes have mostly emptied.
According to flow measurements made between 16:00 and 18:00 UTC on December 5, the flow in Gígjukvísl was 2 310 m3/s (81 000 ft3/s). Between 09:30 and 12:30 on December 6, the flow was was 1 100 m3/s (39 200 ft3/s) and has therefore decreased significantly.
No volcanic tremor has been detected and no increase/changes in geochemical emissions at the volcano are measured, IMO said.
According to calculations from the Institute of Earth Sciences at the University of Iceland, at least 0.8 km3 (0.2 mi3) of water has drained from the sub-glacial lake. Due to this elevated seismic activity, the IMO has decided to raise the Aviation Color Code from Grímsvötn volcano from Yellow to Orange.
There are examples of eruptions in Grímsvötn after water flows from there.
"The last time this happened was in 2004 and before that in 1934 and 1922. In 2004, traces of the start of the eruption were seen on October 28 and the eruption began about three days later, or at the end of the day on November 1," IMO said.
In the days before, the earthquake in Grímsvötn was a sign that an eruption was imminent.
The last eruption in Grímsvötn took place in 2011, but this time it had run out of Grímsvötn just over six months before. Since 2011 it has run a total of 6 times from Grímsvötn without an eruption.
The eruption has taken place every five to ten years from Grímsvötn, and scientists agree that measurements show that conditions are such that Grímsvötn is ready to erupt
quote:Op zaterdag 11 december 2021 09:57 schreef aloa het volgende:
Gave dronebeelden van de nog stomende vulkaan![]()
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Fagradalsfjall volcano (Reykjanes Peninsula, Iceland): volcanic-seismic crisis continues to evolve, earthquake M 5.4 yesterday
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.
quote:More than 5 500 earthquakes near Fagradalsfjall volcano in 48 hours, Iceland
More than 5 500 earthquakes have been registered under Krýsuvík-Trölladyngja volcanic system, east and west of Fagradalsfjall volcano, Reykjanes Peninsula, Iceland since around 09:00 UTC on July 30, 2022. The Aviation Color Code remains at Yellow.
More than 1 800 earthquakes were detected by midnight UTC on July 31, with another 600 over the next 4 hours. By 11:21 UTC on August 1, the number of earthquakes exceeded 5 500.
GPS data shows deformation at stations in the immediate vicinity of the seismic activity. The deformation is consistent with a magma vent forming. This scenario is very similar to the activity in December 2021, but does not seem to be quite as powerful, IMO said.
“GPS displacement data shows magma is pushing its way through the crust at a fast speed, but has not yet broken up through the crust. When that happens is impossible to know, but this might not be a long wait based on the speed the magma is going. Current depth of the magma is around 2 to 4 km (1.2 – 2.4 miles),” said Jón Frímann Jónsson of Iceland Geology in his update posted at 13:47 UTC today.
Increased risk of rockfall is in Reykjanesskagi and has been reported in the area. People are advised to be careful on steep slopes, near sea cliffs and avoid areas where rocks can fall.
The last eruption at this volcano started on March 19, 2021, after more than 50 000 earthquakes registered since February 24, and lasted until September 18, 2021 (VEI 0).
Is dit de vulkaan die op uitbarsten staat?quote:
Jep.. al is niet exact te voorspellen OF er wat gebeurd en waar...quote:Op woensdag 3 augustus 2022 11:58 schreef Starhopper het volgende:
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Is dit de vulkaan die op uitbarsten staat?
Nice! Dan gaat ie onder mijn favorietenquote:Op woensdag 3 augustus 2022 11:59 schreef Frutsel het volgende:
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Jep.. al is niet exact te voorspellen OF er wat gebeurd en waar...
quote:Op woensdag 3 augustus 2022 16:14 schreef Starhopper het volgende:
Gaat het eigenlijk nog heftiger worden? Of blijft het waarschijnlijk bij een druiper?
quote:Op woensdag 3 augustus 2022 16:35 schreef Houtenbeen het volgende:
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De uitbarsting wordt zo krachtig dat het hele eiland uit elkaar spat, wat ervoor zorgt dat er tsunami's van honderden meters hoog ontstaan.
Neem aan dat de meeste routes er nog liggen ...quote:Op woensdag 3 augustus 2022 23:16 schreef Fretwork het volgende:
Vorig jaar september nog geluk gehad en de uitbarsting kunnen meemaken, hopen dat ze nu ook weer veilig kunnen faciliteren en "wandelroutes" kunnen aanleggen.
Nou ja, route is overrated. Een stel palen in de grond over een berg stenen. Enkele routes zijn toen ook met lava overstroomt.quote:Op woensdag 3 augustus 2022 23:20 schreef chufi het volgende:
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Neem aan dat de meeste routes er nog liggen ...
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