Ligt niet plat.quote:Op woensdag 10 augustus 2022 11:28 schreef HulkHeld het volgende:
Mijn vriendin moet daar 1 t/m 3 september heen, is dat uberhaupt te doen nu? Ben niet helemaal op de hoogte of heel IJsland plat ligt nu.
Viel tegen idd. Dit was vannacht.quote:Op woensdag 10 augustus 2022 11:35 schreef chufi het volgende:
Eindelijk weer beeld, na dagen mist rook etc
Mist/wolken: ja, rook: nee. Hij rookte juist bijzonder weinig voor een vulkaan.quote:Op woensdag 10 augustus 2022 11:35 schreef chufi het volgende:
Eindelijk weer beeld, na dagen mist rook etc
En hoe voelt dat ?quote:Op zondag 11 september 2022 01:07 schreef Puntenjager het volgende:
[..]
Mist/wolken: ja, rook: nee. Hij rookte juist bijzonder weinig voor een vulkaan.
[ afbeelding ]
De foto is van 6 augustus. Ik was toevallig op vakantie op IJsland. Tegelijk mijn eerste aardbeving gevoeld en voor het eerst een vulkaan gezien irl
Ik heb helaas maar 1 aardbeving (aardbevinkje) gevoeld. Naar ik aanneem 1 van de wat zwaardere bevingen van 3,5 a 4 op de schaal van richter. In het nieuws werd gemeld dat er letterlijk tienduizenden aardbevingen gemeten werden in dagen vooraf en gedurdende de eruptie. Echter dan spreek je over trillingen die een seismograaf kan meten. Niet wat jij als mens voelt. Tevens waren de bevingen in een gebied op 35 km afstand van Reykjavik.quote:
quote:Glacial flood in Grķmsvötn, Aviation Color Code raised to Yellow, Iceland
A new glacial flood started at Grķmsvötn, a subglacial volcano under Vatnajökull, Iceland, on October 10, 2022, prompting authorities to raise the Aviation Color Code to Yellow and announce the State of Uncertainty.
Glacial flooding can trigger subglacial eruptions, which have been known to happen at Grķmsvötn.
This is the most active volcano in Iceland with eruption intervals every 5 to 10 years. The last took place in 2011 and was quite large and powerful.
The ice sheet has receded by almost 3 m (10 feet) several days before the flood started and by 7 m (23 feet) on October 12, the Icelandic Met Office (IMO) reports.1 If the Grķmsvötn subglacial lake drains completely, the ice shelf can likely sink by some 10 – 15 m (33 – 50 feet) in total.
The flow is currently at 300 m3/s so IMO predicts that the maximum flow out of the lakes will be late Thursday, October 13 or Friday.
Graph showing how much the ice sheet has receded since the beginning of October this year
Graph showing how much the ice sheet has receded since the beginning of October this year. Credit: IMO
It can be calculated that it takes about 24 hours for runoff water to flow under the Skeišarjökull glacier from Grķmsvötn and down to the course of the Gķgjukvķslar by Highway 1. Going forward, it is calculated that the maximum flow out of the lakes will be around 500 m3/s.
It is likely that the flow at the bridge over Gķgjukvķsl will be less than out of the lakes themselves due to the attenuation of the runoff in the reservoirs in front of Skeišarjökull. The flow at the bridge in this run will therefore be equal to the high summer flow and will not have any effect on structures such as roads and bridges.
There is little or no seismic activity in the volcano and no volcanic eruptions have been detected.
The last flood from Grķmsvötn was in December last year, so it’s been a short time since the last flood.
There are examples of volcanic eruptions in Grķmsvötn coinciding with glacial floods. It is likely that the sudden pressure relief due to decreasing water level can trigger eruptions. The last time such a scenario happened was in 2004, and before that in 1934 and 1922.
However, Grķmsvötn has much more often had floods without an eruption.
Two things need to happen for an eruption to start: pressure relief has to be enough to “trigger” and wake up the volcano, and magma pressure within the volcano has to be enough to set off an eruption, but there is uncertainty about both aspects.
The chance of an eruption will quickly decrease after the flood.
The last eruption at this volcano occurred in 2011 CE – May 21 to 28, 2011 (VEI 4) – and emitted about 0.8 km3 (0.20 mi3) of basaltic tephra (bulk volume).
Eindelijk was ik weer net iets eerder dan jouquote:Op donderdag 4 mei 2023 12:30 schreef Houtenbeen het volgende:
Katla naar alert level geel, na meerdere lichte aardbevingen
quote:Strong earthquake swarm in Mżrdalsjökull
At 9.41 am this morning, a strong earthquake swarm started in Mżrdalsjökull glacier. First, but not conclusively verified, results show that three quakes have occurred above magnitude 4.4, with magnitudes 4.5, 4.3 and 4.2.
There have been about seven quakes ranging in magnitude from 3 to 4, the Icelandic Met Office reported.
No harmonic tremors have been detected.
The quakes are located in the center of the caldera. A flight alert colour code for Katla has been put on yellow.
quote:Activity summary:
Yesterday at 09:41 a sudden and intense seismic swarm started in Katla with three earthquakes of magnitude larger than 4 located in the middle of the caldera. Since yesterday afternoon the activity has decreased significantly and no other geophysical measurements show indicators of significant changes or anomalies. Katla is currently back to known background activity and the colour code is changed to green.
quote:Earthquakes Rocking Reykjanes Pointing To Another Eruption
A magnitude 4.0 earthquake woke late sleepers in central Reykjavķk at 8:21 this morning. But, it’s residents of the Reykjanes peninsula that are likely a little worse for wear this morning, waking up from a long night of back to back quakes.
A tally from the Icelandic Met Office lists well over 1000 quakes that have struck the peninsula over the past days, with 21 larger than a magnitude of 3.0. The return of constant rumbling has geologists and volcanologists watching the area closely, with RŚV reporting that an eruption could be imminent at Fagradalsfjall.
The area last erupted at Geldingadalir in 2021 and Meradalir in 2022.
Volcanologist Žorvaldur Žóršarson told the radio station Bylgjan on Monday the land has been inflating under the entirety of the Reykjanes peninsula in recent weeks, signalling rising lava under the surface.
The rising land throughout the entirety of the peninsula – not just under the previous eruptions sites – also signals that the entire peninsula could be one giant active volcano rather than a chain of smaller volcanoes, as previously believed. In theory, that means that lava could begin erupting from any place on the Reykjanes peninsula.
Liever deze, dan b.v. de Katla.quote:Op woensdag 5 juli 2023 13:17 schreef Elan het volgende:
Stel dat dat kreng uitbarst, op wat voor schaal aan gevolgen moeten we dan denken? Wat hinder voor het vliegverkeer, of massa-evacuaties en/of (lokale) klimatologische ellende?
Ah ja dat vroeg ik me af of in augustus het dezelfde betrof. Zat dit verhaal te lezen laatst, wat een horrorgevolgen een grootschalige uitbarsting kan hebben wereldwijdquote:Op woensdag 5 juli 2023 16:04 schreef aloa het volgende:
[..]
Liever deze, dan b.v. de Katla.
Deze is vorig jaar ook al uitgebarsten..
quote:Earthquake swarm close to Eldey and Eldeyjarboša į Reykjanes ridge
It seems that sometimes in the last 24 hours an earthquake swarm started close to Eldey and Eldeyjarboša on the Reykjanes ridge. Largest earthquakes seems to be around Mw3,2 to Mw3,7 or in around that magnitude. Since it is close to impossible to see the earthquakes on the map in all the activity that is happening close to Keilir mountain.
Green stars out in the ocean is the activity on the Reykjanes ridge. There's a lot of activity on this map and the whole thing is a mess to read.
Heavy earthquake activity on the Reykjanes peninsula and Reykjanes ridge. Copyright of this image belongs to Icelandic Met Office.
I don’t know if this earthquake swarm is connected to what is happening in Fagradalsfjall mountain and Keilir mountain. It seems unlikely, but this activity might have been triggered by that earthquake swarm. What is going on there is unclear. Since this is out in the ocean.
Eldey is nu ook verhoogd naar geelquote:Op woensdag 5 juli 2023 16:10 schreef Houtenbeen het volgende:
Alert level voor Fagradalsfjall verhoogt naar oranje
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