Vulkanen IJsland #17 met een Grimmige Grimsvotn

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Op maandag 5 september 2011 10:41 schreef lipjes het volgende:
het rommelt weer lekker

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4.6 earthquake - 2011/09/05 08:22:46 59.004 -30.760 10.0 REYKJANES RIDGE
4.7 earthquake - 2011/09/05 07:19:03 59.040 -30.706 11.0 REYKJANES RIDGE
4.6 earthquake - 2011/09/05 07:15:51 59.018 -30.516 10.0 REYKJANES RIDGE
4.6 earthquake - 2011/09/05 05:44:07 59.046 -30.701 10.0 REYKJANES RIDGE
4.9 earthquake - 2011/09/05 05:05:37 59.143 -30.815 10.2 REYKJANES RIDGE

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Op maandag 5 september 2011 11:44 schreef Ketchupcurry het volgende:

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Op maandag 5 september 2011 11:11 schreef zenkelly het volgende:

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Ja, het is al een poosje aan de gang...zelfs 'inflation'. Magmaverschuivingen in iig de Katla. Je schop ertegenaan heeft wel wat gedaan, lipjes!
Spannend.....

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Growing Harmonic tremors around Katla
It seems that Katla volcano is going to keep me busy for coming days and weeks.

At this moment it seems that there is a growing harmonic tremor in Katla volcano. This harmonic tremor started today after the earthquake swarm that took place earlier today. After it stopped a spikes of small harmonic tremor spikes did start to appear. During the past few hours they have been growing in size. But it seems that the harmonic tremor drops for few moments between spikes.

Earthquake swarm that took place yesterday in Katla volcano. Copyright of this picture belongs to Iceland Met Office.

This earthquake swarm was mostly small one. With largest earthquakes going up to around ML2.1.

From what I can tell this harmonic tremor signal is growing every few hours or so. It is possible that this is a repeat of what did happen in July. But for the moment it is too early to know that for sure at the moment. But for the moment there is no eruption about to start in Katla volcano.

When I was writing this blog post, it seems that a new earthquake swarm is about to start in Katla volcano. But the earthquake swarms in Katla volcano often start slowly with few earthquakes, but they seems to grow with time.

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For the moment: Water seems to be cause of tremors
Most likely water creating harmonic tremors in Katla volcano (for the moment)
Posted on September 6, 2011 by Jón Frímann

In the news from Rúv at 22:00 UTC it was sad that water is the most likely source of the harmonic tremors in Katla volcano. But it seems that hydrothermal activity in Katla volcano is increasing and melting the glacier. But for the past few hours there have been signs of hydrothermal melt water getting into Múlakvísl glacier river, making the river have more water then normal and increasing conductivity in it. This is not glacier flood as such. The cauldrons that formed in July have not changed according to this news, but it was not reported if they had actually gotten deeper or larger.

Due to cloud cover it was not possible to explore the north part of Mýrdalsjökull glacier. Just the south part. According to the news on Rúv at 22:00 new small cauldron have formed in the south part of Mýrdalsjökull glacier. They are shallow at present time and may have taken few weeks for form to present size (not sure how big they are), but among this cauldrons is a cauldron that has not been seen for past seven to eight years, cracks have formed around the cauldron and he has gotten deeper and water has collected in the cauldron. But with more earthquake activity and increased hydrothermal activity under the glacier. So more monitoring is needed on Katla volcano according to Magnús Tumi Guđmundsson volcanologist at University of Iceland.

Note: When I wrote this blog post. It seems that new earthquake swarm is about to start in Katla volcano. At least I think so.

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Op maandag 5 september 2011 13:19 schreef lipjes het volgende:

Tevens Frutsel.
Is het misschien handig om de link naar de aardbevingen te wijzigen naar http://en.vedur.is/earthquakes-and-volcanism/earthquakes/ ?

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Op woensdag 7 september 2011 12:36 schreef Frutsel het volgende:

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Welke moet dan veranderd worden? Of gewoon als extra erbij?

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6-9-2011 | 09:01 Onrustig rond Katla
Sinds begin juli is er een toename van het aantal kleine aardbevingen bij de Katla. Ook is er de laatste dagen een kleine toename van harmonische trillingen. Dat laatste duidt gewoonlijk op magmaverplaatsingen onder de vulkaan.
De Katla kent meer onrustige periodes zoals deze.

Er zijn GEEN signalen, die wijzen op een mogelijke uitbarsting op korte termijn.
Vandaag:
Er blijven zich kleine bevingen voordoen in/rond de Katla.
Ook zijn er plekken met verhoogde thermische activiteit, te zien aan een nieuwe verdieping in de gletsjer.
De gletsjervloed in de Mulakvisl van deze zomer was hier ook het gevolg van.

Verder is het afwachten, hoe dit zich ontwikkelt. De ideeen hierover lopen uiteen.
Vooralsnog wordt er NIET uitgegaan van een uitbarsting op (zeer) korte termijn. Het is tevens zeer goed mogelijk, dat deze golf van activiteit weer overgaat en de rust weerkeert.

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Op woensdag 7 september 2011 13:44 schreef Frutsel het volgende:
heb trouwens het gevoel dat het woord "KATLA" in de TT van #18 komt

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Op zaterdag 17 september 2011 13:20 schreef blids het volgende:
Ik vind dit topic wel erg offtopic geraakt, omdat we het alleen over Katla hebben en dat daar door het on overzichtelijk wordt