Vulkanen IJsland #17 met een Grimmige Grimsvotn

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Op maandag 11 juli 2011 13:37 schreef Frutsel het volgende:
Kan dit topic niet sneller? Dan kan eindelijk de TT eens aangepast worden naar iets als Kahaarin Katachtige Katla Krampjes ofzo

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Op maandag 11 juli 2011 13:40 schreef lipjes het volgende:

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jij kan de TT toch aanpassen fruts?

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Op maandag 11 juli 2011 13:40 schreef lipjes het volgende:

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jij kan de TT toch aanpassen fruts?

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Op maandag 11 juli 2011 13:42 schreef Frutsel het volgende:

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Klopt, maar dan dekt hij de lading van de eerste 150 posts niet meer
Maar goed, zal vanzelf wel vollopen

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Op maandag 11 juli 2011 13:46 schreef Keiichi het volgende:

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Als Katla knalt zijn we gelijk 10 topics verder

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Op maandag 11 juli 2011 13:48 schreef Frutsel het volgende:

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Zal wel meevallen, dan jat NWS al onze viewers

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Op maandag 11 juli 2011 14:52 schreef lipjes het volgende:
en ik zat zo eens wat bij te lezen, denk da tik binnenkort maar eens een bezoekje breng aan laacher see

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Katla floods

Scientists went on expeditions to the site of the glacial flooding by Mũrdalsjökull glacier in south Iceland last weekend to learn more about the circumstances and take samples of gas and water to determine whether the sub-glacial volcano Katla erupted. The flood in Múlakvísl occurred on Friday night and caused the Civil Protection Department to declare a level of danger on Saturday morning, Fréttabladid recollects. First there was a small flood which reached the bridge across Múlakvísl and shortly afterwards the large glacial flood arrived, tearing down the 128-meter long bridge. Trucks and a specialized bus started ferrying people across the river yesterday. The Red Cross opened multi-service help centers in the elementary schools in Vík and Kirkjubaejarklaustur. Approximately 200 people were evacuated from Álftaver, Medalland and Thakgil. They were permitted to return to the area on Saturday afternoon when the danger level was downgraded to a lower level of uncertainty. Only a part of Mũrdalsjökull is still defined as a danger zone. The flood originated in three known calderas (not two as reported earlier) in Mũrdalsjökull and one new caldera was formed.

The flood also created massive cracks in the glacier. Earthquake sensors clearly indicated activity as of 8:30 pm on Friday, which increased significantly shortly after 10 pm. Around 5 am on Saturday morning, the activity started subsiding. Scientists from the University of Iceland Institute of Earth Sciences took samples from the flood water on Saturday and Sunday. By analyzing the water they hope to find out whether this was just a flood or whether a small eruption occurred underneath the icecap where the volcano Katla lies. According to Morgunbladid, samples of gas and other chemicals collected by the team of scientists indicate the flood was likely caused by geothermal water. However, an eruption cannot be ruled out. “The only thing we can be absolutely sure of is that there is a lot of heat underneath Katla and that there is meltwater there, regardless of whether it is geothermal water or whether it was caused by eruptions,” commented Sigurdur Reynir Gíslason, a geochemist at the University of Iceland. It is also clear that magma is moving but it isn’t certain that it has reached the surface, Gíslason added. There is a sound reason to monitor Katla closely as its eruptions can prove dangerous.

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We also saw a small jokulhlaup from Katla over the weekend that got a lot of people very worked up for sure. The unrest at the Icelandic volcano seems to have ended for the time being, but a close watch will be kept on Katla. The Icelandic Met Office has posted a brief summary of the flood that swept away a bridge at Múlakvísl and the Ring Road will likely be disrupted for months. However, the question of whether the flood was related to a very small eruption is still being explored (Icelandic). Be sure to check out the cool video of the flight over Katla after the jokulhlaup that shows the early stages of some of the 50-meter deep collapse structures (see below) that have appeared on the Mũrdalsjökull glacier.

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Op maandag 11 juli 2011 14:52 schreef lipjes het volgende:
en ik zat zo eens wat bij te lezen, denk da tik binnenkort maar eens een bezoekje breng aan laacher see

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This harmonic tremor spike was small compared to the one on 8 – 9. July 2011. But this means that this area continues to be highly active and dangerous in my opinion. While there currently is an little pause ongoing in this area. I do not think that current events are over. When they end and how I don’t have any idea. But I am guessing that this is going to end in an full eruption of Katla volcano. When that might happen is something I don’t have any idea about.

For the moment. The only thing that can be done is to wait and see what happens in Katla volcano.

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Magnitude ML 3.3
Region ICELAND
Date time 2011-07-13 16:04:40.5 UTC
Location 63.65 N ; 19.08 W
Depth 1 km
Distances 149 km E Reykjavík (pop 113,906 ; local time 16:04:40.5 2011-07-13)
148 km E Hafnarfjörđur (pop 22,289 ; local time 16:04:40.5 2011-07-13)
63 km E Vestmannæyjar (pop 4,203 ; local time 16:04:40.5 2011-07-13)

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Op woensdag 13 juli 2011 18:25 schreef Frutsel het volgende:
3.3 aardbeving op IJsland zojuist... dit soort bevingen kunnen wel iets in gang zetten

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Currently the glacier flood has peaked and is getting lower. There not expected to be any damage from this glacier flood on human structures or roads. This area of Iceland is unpopulated. The water is going into large lakes in the area where the effects of this glacier flood are almost none. The glacier flood did flow into a dam lake that is collecting water from rivers that this glacier flood did go into. This did make the lake rise about 70 cm in several hours and fill it. No damage is expected from this glacier flood to the dam or other structures in this area connected to the dam. But it is estimated that 26 gigaliters did flow into the dam lake during the night from this glacier flood.

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This earthquake took place around 00:30 UTC on 13. July 2011. It is filtered at 1Hz and is extremely long period earthquake. This suggests that magma did create this earthquake.

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Op maandag 11 juli 2011 14:59 schreef kahaarin het volgende:

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Ah, een bezoek aan de vulkaan aldaar. Is een monster, ik hoop dat die blijft slapen. Er is daar een VEI6 of hoger uitbarsting geweest meen ik, ergens in de prehistorie. Hij schijnt nog actief te zijn, dwz op geothermaal vlak.

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Op woensdag 13 juli 2011 20:01 schreef kahaarin het volgende:

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Hij is naar beneden geschaald:
http://www.vedur.is/skjal(...)lsjokull/#view=table
De tremormetingen jojo-en het hele scherm door:
http://hraun.vedur.is/ja/oroi/god.gif Westen van Katla
http://hraun.vedur.is/ja/oroi/alf.gif Zuiden van Katla
http://hraun.vedur.is/ja/oroi/rju.gif Oosten
http://hraun.vedur.is/ja/oroi/sly.gif Noorden

De Badarbunga gaat ineens ook weer zeuren om aandacht, gletsjerloop nr2 is in aantocht:
http://www.jonfr.com/volcano/?p=1190

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http://www.jonfr.com/volcano/?p=1181

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[ afbeelding ]

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Op donderdag 14 juli 2011 07:29 schreef RaymondK het volgende:

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Ik denk dat je deze bedoelt:
http://www.geschiedenis24(...)IJsland-in-1783.html
Invloed van deze vulkaanuitbarsting leide naar alle waarschijnlijkheid tot de Franse revolutie.
Die knaller was in 1783. Nu is "Prehistorie" een ruim begrip natuurlijk.

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Ontstaan

De caldera werd 12.900 jaar geleden gevormd na de uitbarsting van de Laacher vulkaan. De achtergebleven korst stortte vermoedelijk 2 of 3 dagen na de uitbarsting in de lege magmakamer eronder. De resten hiervan kunnen nog door heel Europa teruggevonden worden en de tefra wordt vaak gebruikt voor het dateren van sedimenten. Een aantal unieke mineralen kan in de omgeving gevonden worden en mijnen halen de stenen uit de grond om te gebruiken als bouwmaterialen.
Met een geschatte Vulkanische-explosiviteitsindex van 6 (met ruim 5 kmŗ aan puin), was de uitbarsting van de Laacher vulkaan 5 keer krachtiger dan die van Mount Saint Helens in 1980 (VEI van 5 met 1,2 kmŗ aan materiaal).

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Op donderdag 14 juli 2011 09:14 schreef lipjes het volgende:

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wacht ff, duur die aardbeving nu gewoon meer als een minuut ?

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Possible minor eruption in Hamarinn volcano yesterday. Update on Katla volcano
Posted on July 14, 2011 by Jķn Frímann
There appears to be more in this new hydrothermal activity in Hamarinn volcano then at first sight. It seems that this actually might have a eruption in Hamarinn volcano (Bárđarbunga volcano). If this event is confirmed, this is the first eruption in Hamarinn volcano since the year 1910.

This also mean that there is a chance of more activity in this area in coming weeks or months. But when it might happen is impossible to know.

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Update on Katla volcano

Here is a short update on Katla volcano. There have been repeated short burst of harmonic tremors taking place inside the Katla volcano caldera. This harmonic tremor spikes have been small and they are hard to see on the harmonic tremor graph that Icelandic Met Office has on-line. Other then this it has been quiet so far in Katla volcano.

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Op vrijdag 15 juli 2011 19:36 schreef habbol het volgende:
Intressant! Tijd om de boel extra in de gaten te houden. Iemand al een cam van Bárđarbunga gevonden?

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Geophysicist Helgi Björnsson said a magma intrusion caused the glacial flood from Köldukvíslarjökull, a part of Vatnajökull in southeast Iceland, on Tuesday night. It is possible that a minor eruption occurred underneath the icecap. The Köldukvíslarjökull flood originated in a previously unknown high-temperature geothermal area in the western part of Vatnajökull. Björnsson explained that the magma intrusion occurred near the bottom of the glacier, possibly extending into the ice, and thus furthering glacial melt. He reasoned that it is possible that a minor sub-glacial volcanic eruption occurred, even though it didn’t penetrate the icecap, which is 300 meters thick in this area. Björnsson added it is fairly likely that further seismic activity will occur in the area in the near future—the glacial flood was preceded by tremors—and therefore it should be monitored closely. Earth scientists say both recent glacial floods, from Mũrdalsjökull and Vatnajökull, can be explained by volcanic activity and therefore a close eye must be kept on the volcanoes that lie underneath these glaciers, even though there are no indications of imminent eruptions. Not even two months have passed since the volcanic eruption in Vatnajökull’s Grímsvötn and only one year ago the infamous Eyjafjallajökull erupted. Geologist Oddur Sigurdsson at the Icelandic Meteorological Office noted there has clearly been an increase in volcanic eruptions in Iceland since the mid-20th century.

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Op zaterdag 16 juli 2011 01:04 schreef Frutsel het volgende:

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