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Grimsvotn Volcano


Many questions have come up following the recent eruption in Grímsvötn, Vatnajökull.
How does the eruption affect Iceland and air travel? Are tourists safe in Iceland? We hope to
answer most of your questions here in this document, but if you seek further information feel
free to visit us online at www.iceland.is, where you will find all the links and the latest up dates
that you need.
Bottom line: Travelers are safe and secure in Iceland – and can enjoy all the same activities as
before and even more!
Who are we?
Geologically speaking, Iceland is a very young country and still forming before our eyes. Icelanders are
a resilient people and have learned to live in harmony with the geological wonders of the island. These
very same forces of nature create the natural hot pools, the geysers, and the geo-thermal energy that
make Iceland unique.
The Department of Civil Protection and emergency management authorities in Iceland are always
prepared to cope with natural hazards. Emergency response teams are extremely well trained and on
the alert when nature decides to show its force. Preparedness is the key to safety in the face of any
danger. This includes understanding the situation, its consequences, and having a plan of action. The
Department of Civil protection, in cooperation with emergency teams has the situation well under hand.
About Grímsvötn
Grímsvötn is a basaltic volcano, located near the centre of the Vatnajökull ice cap, the largest ice
cap in Europe. It is the most active volcano in Iceland. There have been approx. 70 eruptions in the
Grímsvötn volcanic system in historical times. This is the fifth eruption since 1983, the last eruptions
through glacier occurred in 2004, 1998, 1996, 1983 and 1934. These eruptions occurred in the
Grímsvötn depression with the exception of the eruption in 1996 known as Gjálp. The volcano has a
caldera complex, the most recent one hosting the Grímsvötn subglacial caldera lake that is sustained
by extensive geothermal activity. The volcano is almost fully ice covered and interaction of magma and
meltwater from the ice causes phreatomagmatic explosive activity.
How does this eruption compare to the eruption in
Eyjafjallajökull in 2010?
In volume, the volcanic eruption in Grímsvötn started out with great force in the beginning, but has
since scaled down considerably. The plume has held steady at about 10 km lately, which is slightly
more than the plume from Eyjafjallajökull.
The most important difference however, is the nature of the magma that it is projecting. The magma
from Eyjafjallajökull was explosive in nature and created very fine ash particles, 90% of which was in
grains less than 1 mm. Grímsvötn on the other hand erupts basalt magma, which is rarely explosive.
The fragmentation is therefore less efficient, and the ash particles it projects are much coarser, and
not likely to stay airborne for long. At the moment, there is melt water flowing into the crater, and the
interaction of magma and meltwater from the ice causes phreatomagmatic explosive activity, but
according to predictions, that should cease soon as the lava walls of the crater build up. This should
greatly reduce explosions, resulting in a flowing stream of magma, and greatly reduced ash particles
The dominating weather system at the moment is also quite different. During the Eyjafjallajökull
eruption, there was a high-pressure system over Northern-Atlantic, which dispersed the ash over
Europe.
Will other volcanoes erupt?
There is nothing to indicate increased activity in other volcanoes.
How long will the eruption last?
It is difficult to predict how long an eruption can last. The last eruption in this area was in 2004 and
lasted for a week. There have been several eruptions in Grímsvötn in the last decades, and they have
all been relatively short lived. An eruption in 1873 lasted seven months, but intensity was relatively low
during that time. After a forceful start to this eruption, it started to show reduced activity on day two.
How does this affect inhabitants?
Falling ash has been reported in most parts of the country, but most of the effects of the eruption are
felt in the area surrounding the site of the eruption, a scarcely populated area in the southern-part of
Iceland. The eruption itself is taking place in Vatnajökull, which is the largest glacier in Europe, far
from populated parts of the country. Considerable ash has fallen in to the south of the eruption, and
inhabitants in these areas are advised to stay indoors and wear masks if they need to go outside.
Tests conducted on samples from the ash in the area have shown very low levels of fluoride and other
toxins, so no special measures have been taken regarding toxicity of any kind.
Day-to-day life continues as usual in Iceland, businesses are open and society functions normally. As
before, there is plenty to see and do while in Iceland!
Is it safe?
It is safe to say that injuries or fatalities due to volcanic eruptions in Iceland are extremely rare. Since
1947 there have been two deaths related to volcanic eruptions. In that time there have been 12
volcanic eruptions. The first death involved a scientist who was killed by rocks falling from the front of
a lava stream where he was collecting samples, this was during the eruption of Hekla in 1947. The
second instance involved a person who entered the basement of a building in a low-lying area where
volcanic gases had gathered during the eruption of Heimaey in 1973. In both instances these people
were in areas where no access would be allowed today.
Preparedness is the key to safety in the face of any hazard. Preparedness includes understanding
the hazard and it´s consequences and having a plan of action. Injuries or fatalities due to volcanic
eruptions in Iceland are extremely rare, and there have been no such cases due to the volcanic
eruption. The Grímsvötn volcano is located to the south of Iceland, and only covers a tiny part of the
large island. It poses no safety threat to the general population.
Can floods be expected?
Floods will often follow an eruption in this area. These are glacier outburst flood, as the area of activity
is subglacial, and a caldera lake rest under the icecap above. The area is closely monitored by online
gauges in several rivers around the volcanoes, The water levels in the caldera area above the volcano
were low to begin with. Large or damaging floods are therefore not expected in connection to this event
unless changes occur in the eruption pattern.
How is the eruption monitored?
The Icelandic Meteorological Office (IMO) monitors earth movements, water conditions and weather
and issues warnings. Many kinds of measurements are carried out by the IMO and other agencies
that provide valuable information used to warn of impending danger, for example potential eruptions
and floods. The IMO’s weather radar on the southwest tip of the country and the mobile radar, which
is located in Kirkjubaejarklaustur, shows the height of the ash plume, which is important for calculating
the distribution of the ash. There is a 24/7 watch at the IMO, where a meteorologist is present and a
seismologist and hydrologist are on call. The IMO works closely with the National Emergency Agency,
the University of Iceland and the British Meteorological Office, where the London VAAC (Volcanic
Ash Advisory Centre) is stationed. The London office gives information on ash which are based on
information from the Icelandic Met Office.
How are eruptions forecast and monitored in Iceland?
To forecast and monitor seismic and volcanic activity in Iceland, IMO operates a nationwide digital
network of seismic stations and continuous GPS stations. Subglacial eruptions often co-incide with
glacial floods. To monitor the glacial floods, IMO uses water-level gauges and electrical conductivity
meters.
How do I find weather forecasts for Iceland?
Information on the weather conditions near the volcano can be viewed on the weather pages of
the IMO-web. The text forecast is most reliable but maps with specific wind-, temperature- and
precipitation forecasts are automatic. The difference between the weather in the lowland and in the
mountains can be considerable. Wind-chill and wetness (rain, snow or blowing snow) are always a
potential hazard, as sudden weather changes are more common on higher ground than in the lowland.
Can I fly?
The Grímsvötn eruption has not caused wide-spread disturbances to flight schedules. There have
been local disturbances, with Icelandic airports, including Keflavík International Airport, closing
down for about 24 hours. Based on weather predictions and ash dispersion models, wide-ranging
disturbances to flight schedules are not considered likely.
As a precaution, passengers are asked to monitor flight schedules closely on travel industry web sites.
Even if volcanic ash might still affect air travel, there are four international airports in Iceland, and if
one were to close down, air traffic would be directed to one of the others.
Clean and safe!
Iceland ranks as the cleanest country in the world, according to Forbes magazine. We are used to
the geothermal activity of all kinds and have learned to make the most of them. As a result Iceland is
one of the world’s leaders in green energy and sustainable development. It is also the only Western
country that produces all its electricity from emission-free and sustainable natural resources in the
form of geothermal and hydro power.

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