[BREAKING] Vulkanen IJsland #21: Eruptie op komst bij Reykjanes?

quote:

Op zaterdag 19 maart 2016 14:56 schreef DemonRage het volgende:
Gaan we weer zo'n periode krijgen dat we met z'n allen met spanning de IJslandse vulkanen in de gaten gaan houden?

quote:

Op maandag 11 juli 2016 23:41 schreef thesiren.nl het volgende:
Ha vandaag bij groeten van Max hadden ze ook een verhaal over de Hekla die op uitbarsten stond. Ze vertellen graag horrorverhalen over vakanties dus nu ook weer, binnen onafzienbare tijd staat het hele vliegverkeer stil. Allemaal omdat 1 professor zegt dat er nu twee maal zoveel druk staat als bij de laatste uitbarsting. Toen namen ze contact op met een Hollandse Fysisch-(geograaf/geoloog) die daar ook reisleider is, die zei dat de professor dat ieder jaar rond deze tijd vertelt! Hij voegde er gelijk aan toe dat het niet zo heftig zal zijn als met de ejafjellajokul, dat was wel een domper voor die presentator.
http://www.omroepmax.nl/g(...)aandag-11-juli-2016/
Vanaf 22:30 Leuk om te zien

quote:

Monitoring of Hekla improved

Monitoring of Mt. Hekla has been improved over the past months, Hekla is one of the most active and potentially dangerous volcanoes in Iceland. According to the Icelandic Meteorological Office (IMO) who is in charge of monitoring Mt. Hekla the system should help in sending out timely warnings with the aim of reducing any harm the volcano might cause.

There are several different types of active volcanoes in Iceland and the hazards associated with each volcano are related to the type, location and intensity of an eruption. According to the IMO public vulnerability to volcanic hazards increases as the number of people exposed to the hazard grows.


Mt. Hekla has been getting ready to erupt now for some years and is according to its normal eruption cycle ready to go, the mountain is a stratovolcano in the south of Iceland with a height of 1,491 m (4,892 ft). Over 20 eruptions have occurred in and around the volcano since 874.with the last one happening in the year 2000.

Travelers are warned not to walk the mountain.

According to the IMO, volcanic risk is mitigated by the capability to detect, interpret, and communicate volcanic signals before and during a volcanic eruption.

quote:

Scientists Follow Katla Volcano Closely

The water level of glacial river Múlakvísl has risen in line with increased seismic activity in volcano Katla, which lies under Mýrdalsjökull icecap in South Iceland. Scientists are monitoring developments in the volcano closely.

Geophysicist Páll Einarsson finds it likely that melt water from cauldrons in Katla has flowed into Múlakvísl from underneath the glacier. His theory is supported by increased conductivity in the river, mbl.is reports.

At the current stage, the glacial outburst flood is insignificant compared to the massive flood which occurred in Múlakvísl in 2011 and destroyed a bridge on the Ring Road. There are currently no indications of an upcoming volcanic eruption.

Katla last erupted in 1918, causing flooding and ash fall.

twitter:

Iceland_Review twitterde op dinsdag 26-07-2016 om 14:32:15 Increased seismic activity in #Katla #volcano continues. #Iceland https://t.co/HPvM1WBwoT reageer retweet

quote:

Op woensdag 27 juli 2016 13:15 schreef aloa het volgende:
En momenteel gewoon weer rustig bij de Katla.

quote:

Op dinsdag 26 juli 2016 13:45 schreef Frutsel het volgende:

[..]

[ afbeelding ]

quote:

Op vrijdag 29 juli 2016 23:46 schreef aloa het volgende:

[..]

We wachten het af. kan idd alle kanten op.

quote:

Remarks of a specialist
According to local reports, the level of the Bláfjallakvísl glacial river is unusually high. Bláfjallakvísl originates from the northern side of Mýrdalsjökull and hikers are advised to show caution if crossing the river.

Water-level and electrical conductivity measurements at the bridge over Múlakvísl show increased drainage of geothermal meltwater from Mýrdalsjökull. Sulfur smell has been reported from the area related to this drainage.
Written by a specialist at 29 Jul 18:08 GMT

quote:

Op zaterdag 30 juli 2016 00:08 schreef aloa het volgende:

[..]

Het gaat ook nooit rustig worden op IJsland.

quote:

Yesterday, August 3rd, there was a seismic swarm in Bárðarbunga. At 16:15, a magnitude 3,9 earthquake, the largest of the swarm, was detected in the northern rim of the volcano's caldera. This swarm is not thought to be out of the ordinary when compared to the activity in Bárðarbunga over the past few months, but nonetheless, the volcano is being thoroughly monitored around the clock.
Written by a specialist at 04 Aug 01:58 GMT

quote:

Iceland raised alarm after biggest tremor since 1977 hits largest volcano
Iceland raised the alarm after its largest volcano was hit by the biggest tremors since 1977.
Two quakes larger than 4 in magnitude early Monday rocked the crater of Katla, the country’s Met Office said in a statement. That was followed by at least 10 more tremors at the volcano, which rises 1,450 meters (4,757 feet) into the air on the North Atlantic island’s southern coast.

There were no immediate reports of casualties or damages to property.

Katla last erupted in 1955 and 1999. Neither of those were large enough to break the ice covering its 10 kilometer-wide (6 mile) caldera. Its last major eruption was back in 1918, when it spewed ash for more than five weeks.

An eruption of the Eyjafjallajokull volcano in 2010 caused the cancellation of more than 100,000 flights across Europe on concern that glass-like particles formed from lava might melt in aircraft engines and clog turbines. Historically, Eyjafjallajokull has been known to erupt one to two years prior to Katla.

twitter:

jonfr500 twitterde op maandag 29-08-2016 om 21:46:15 Increased conductivity reported in Múlakvísl glacier river from Mýrdalsjökull glacier, with increased water levels. This is report from IMO. reageer retweet

quote:

This is not going to be a too long update about the activity in Katla volcano. Since I fear that this article might become outdated rather quickly.

quote:

IJsland vreest voor uitbarsting vulkaan Katla

IJsland maakt zich op voor een mogelijke uitbarsting van de vulkaan Katla, een van de grootste vulkanen van het land. Het gebied is vanmorgen geraakt door twee krachtige aardbevingen, wat mogelijk een uitbarsting kan veroorzaken.

Het gebied werd vanmorgen vroeg getroffen door aardbevingen van respectievelijke 4.5 en 4.6 op de schaal van Richter. Gevreesd wordt dat de trillingen een uitbarsting kunnen bespoedigen. ,,Het is een behoorlijk dynamische situatie op dit moment, en dat zal de komende uren en dagen zo blijven", aldus wetenschapper Matthew Roberts van het meteorologisch instituut van IJsland. ,,Maar op dit moment zien nog we geen direct gevaar."

IJskap
De 1450 meter hoge vulkaan is voor het laatst in 1918 uitgebarsten. Volgens wetenschappers zou er binnenkort sowieso weer een uitbarsting kunnen zijn, hoewel het ook nog decenia kan duren.

De vulkaan is bedekt met ijs dat de hete lava bij een uitbarsting ruim een uur zou moeten kunnen tegenhouden. Daardoor is er genoeg tijd om het gebied te evacueren en het vliegverkeer in te seinen, licht Roberts toe.

Aswolk
De as afkomstig van de uitbarsting van de dichtbijgelegen vulkaan Eyjafjallajökull legde in 2010 het Europese vliegverkeer nog plat voor zes dagen.

quote:

Cluster of Big Earthquakes Rattles Iceland’s Katla Volcano

LAST NIGHT, A brief earthquake swarm rattled the caldera at Katla in southern Iceland. The largest earthquakes were over M4, ranging from a few kilometers deep to near the surface (although the depth locating is likely problematic for many of the smaller earthquakes). These M4+ earthquakes (see below) are the largest temblors to occur to Katla since 1977 (note: those earthquakes did not lead to any eruption). However, although a few of the earthquakes were fairly large, the swarm seems to have petered out quickly as seismicity returned to background levels by Icelandic morning.

The Icelandic Meteorological Office is reporting no tremor recorded currently at Katla, which suggests that at least for the moment, no magma is making its way to the surface. Icelandic officials have not changed the alert status for Katla from normal at this point.

UPDATE 8/29 at 8 PM EDT: The IMO has now reported that flow in the Múlakvísl River, which flows out from under Mýrdalsjökull, has increased and has high concentrations of sulfur dioxide and hydrogen sulfide. Both of these are common gases related to hydrothermal fluids (heated from magmatic sources). This is a common occurrence when earthquake swarms have disturbed the Katla caldera and is not likely directly linked to any change in eruption likelihood.

The earthquake swarm that occurred on the night of August 29 at Katla in Iceland. The green stars are earthquakes over M4.
The earthquake swarm that occurred on the night of August 29 at Katla in Iceland. The green stars are earthquakes over M4.ICELANDIC MET OFFICE
Two big hazards exist at Katla right now. One is obviously that the volcano might have its first eruption since 1918. That lack of harmonic tremor means that the likelihood of an imminent eruption is low. The other hazard might be a jökulhlaup, or glacial outburst flood. Melting from the summer within the Myrdalsjökull icecap and that meltwater can accumulate until it spills over as a flood of water, ice, and debris. These have occurred often and do not need to be associated with any volcanic activity.

Katla has experienced numerous earthquake swarms in the 98 years since its last eruption, most recently in 2011. So this new one, even with its larger earthquakes, is no reason for immediate alarm. Katla does have a history of large, explosive eruptions, which means it makes people nervous. Keeping an eye on any restlessness at the behemoth is vital for both the people of Iceland and for air travel across the North Atlantic.