Skógafoss and Eruption in Eyjafjallajökull (AE74)

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Location Skógar, Iceland
Coordinates 63°31′47″N 19°30′50″W / 63.52972°N 19.51389°W / 63.52972; -19.51389Coordinates: 63°31′47″N 19°30′50″W / 63.52972°N 19.51389°W / 63.52972; -19.51389
Type Cataract
Total height 60 m (200 ft)
Total width 25 m (82 ft)
Number of drops 1
Watercourse Skógá

Skógafoss (pronounced [ˈskou.aˌfos]) is a waterfall situated in the south of Iceland at the cliffs of the former coastline. After the coastline had receded seaward (it is now at a distance of about 5 kilometres (3.1 miles) from Skógar), the former sea cliffs remained, parallel to the coast over hundreds of kilometres, creating together with some mountains a clear border between the coastal lowlands and the Highlands of Iceland.

The Skógafoss is one of the biggest waterfalls in the country with a width of 25 metres (82 feet) and a drop of 60 m (200 ft). Due to the amount of spray the waterfall consistently produces, a single or double rainbow is normally visible on sunny days. According to legend, the first Viking settler in the area, Þrasi Þórólfsson, buried a treasure in a cave behind the waterfall. A local boy found the chest years later, but was only able to grasp the ring on the side of the chest before it disappeared again.[1]

At the eastern side of the waterfall, a hiking and trekking trail leads up to the pass Fimmvörðuháls between the glaciers Eyjafjallajökull and Mýrdalsjökull. It goes down to Þórsmörk on the other side and continues as the famous Laugavegur to Landmannalaugar.



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Gígjökull, Eyjafjallajökull’s largest outlet glacier covered in volcanic ash
Eyjafjallajökull is located in Iceland


Location in Iceland

Location Iceland
Coordinates 63°38′N 19°36′W / 63.633°N 19.6°W / 63.633; -19.6Coordinates: 63°38′N 19°36′W / 63.633°N 19.6°W / 63.633; -19.6
Area 100 km2 (40 sq mi)
Thickness 28018
Status May 2010

Eyjafjallajökull (pronounced [ˈɛɪjaˌfjatl̥aˌjœkʰʏtl̥] ( listen)) — Icelandic for “island-mountain glacier”[1] — also known as E15, is one of the smaller ice caps of Iceland, situated to the north of Skógar and to the west of Mýrdalsjökull. The ice cap covers the caldera of a volcano with a summit elevation of 1,666 metres (5,466 ft) . The volcano has erupted relatively frequently since the last glacial period, most recently in 2010[2][3][4] and from 1821 to 1823.



  • 1 Geography
  • 2 Etymology
  • 3 Geology
  • 4 1821 to 1823 eruptions
  • 5 2010 eruptions
  • 6 Eyjafjallajökull and Katla
  • 7 See also
  • 8 References
  • 9 External links

[edit] Geography

The ice cap covers an area of about 100 square kilometres (39 sq mi), feeding many outlet glaciers. The main outlet glaciers are to the north; Gígjökull, flowing into Lónið, and Steinholtsjökull, flowing into Steinholtslón. The glacier is the 6th largest in Iceland.[5] In 1967 there was a massive landslide on the Steinholtsjökull glacial tongue. On January 15, 1967 at 13.47.55 there was an explosion on the glacier. It can be timed because the earthquake meters in Kirkjubæjarklaustur monitored the movement. When about 15 million cubic meters of material hit the glacier a massive amount of air, ice, and water began to move from under the glacier out into the lagoon at the foot of the glacier.[5]

The mountain, a stratovolcano, stands 1,651 metres (5,417 ft) at it highest point, and has a crater 3–4 kilometres (1.9–2.5 mi) in diameter, open to the north. The crater rim has three main peaks, being (clockwise from the north-east) Guðnasteinn, 1,500 metres (4,900 ft) (approx), Hámundur, 1,651 metres (5,417 ft) and Goðasteinn, 1,497 metres (4,911 ft). The south face of the mountain was once part of Iceland’s Atlantic coastline, from which, over thousands of years, the sea has retreated some 5 kilometres (3.1 mi). The former coastline now consists of sheer cliffs with many waterfalls, of which the best known is Skógafoss. In strong winds, the water of the smaller falls can even be blown up the mountain. The area between the mountain and the present coast is a relatively flat strand, 2 to 5 km wide, called Eyjafjöll.

The volcano is fed by a magma chamber under the mountain, which in turn derives from the tectonic divergence of the Mid-Atlantic Ridge. It is part of a chain of volcanoes stretching across Iceland. Its nearest active neighbours are Katla, to the northeast, and Eldfell, on Heimaey, to the southwest. The volcano is thought to be related to Katla geologically, in that eruptions of Eyjafjallajökull have generally been followed by eruptions of Katla. The Eyjafjallajökull volcano erupted in 920, 1612 and again from 1821 to 1823 when it caused a glacial lake outburst flood or jökulhlaup.[6] It has erupted twice in 2010—on 20 March and in April/May. The March event forced a brief evacuation of around 500 local people,[7][8] but the 14 April eruption was ten to twenty times more powerful and caused substantial disruption to air traffic across Europe, and is ongoing. It has caused the cancellation of thousands of flights across and to Iceland.

[edit] Etymology

Active volcanic areas and systems in Iceland

The name Eyjafjallajökull is made up of the words eyja (genitive plural of ey, meaning eyot or island), fjalla (genitive plural of fjall, whose nominative plural is fjöll, meaning fells or mountains) and jökull (meaning glacier, or, more properly here, ice cap, cognate with the -icle in icicle). A literal translation would thus be the “islands’ fells’ ice cap” or the “islands’ mountains’ ice cap”. The name Eyjafjöll describes the southern side of the volcanic massif together with the small mountains which form the foot of the volcano. The village and museum of Skógar are also part of the region undir Eyjafjöllum (meaning “under the Eyjafjalls”).

[edit] Geology

The stratovolcano, whose vents follow an east-west trend, is composed of basalt to andesite lavas. Most of its historical eruptions have been explosive.[9] However, fissure vents occur on both (mainly the west) sides of the volcano.[10]

[edit] 1821 to 1823 eruptions

Some damage was caused by a minor eruption in 1821.[11] Notably, the ash released from the eruption contained a large fraction of fluoride, which in high doses may harm the bone structure of cattle, horses, sheep and humans. The eruption also caused some small and medium glacier runs and flooding in nearby rivers Markarfljót and Holtsá. The eruptive phase started on 19 and 20 December 1821 by a series of explosive eruptions and continued over the next several days. The sources describe heavy ash fall in the area around the volcano, especially to the south and west.

After that event the sequence of eruptions continued on a more subdued level until June 1822.

From the end of June until the beginning of August 1822, another sequence of explosive eruptions followed. The eruption columns were shot to considerable heights, with ashfall in both the far north of the country, in Eyjafjörður, and in the southwest, on the peninsula of Seltjarnarnes near Reykjavík.

The period from August to December 1822 seemed quieter, but farmers attributed the death of cattle and sheep in the Eyjafjörður area to poisoning from this eruption, which modern analysis identifies as fluoride poisoning. Some small glacier runs occurred in the river Holtsá. A bigger one flooded the plains near the river Markarfljót. The sources don’t indicate the exact date.

In 1823, some men went hiking up on Eyjafjallajökull to inspect the craters. They discovered a fissure vent near the summit caldera a bit to the west of Guðnasteinn.

In early 1823, the nearby volcano Katla under the Mýrdalsjökull ice cap erupted and at the same time steam columns were seen on the summit of Eyjafjallajökull.

The ash of Eyjafjallajökull’s 1821 eruptions is to be found all over the south of Iceland. It is dark grey in colour, small-grained and intermediate rock containing about 28-40% silicon dioxide.

[edit] 2010 eruptions

Main articles: 2010 eruptions of Eyjafjallajökull, Aftermath of the 2010 Eyjafjallajökull eruption, and Air travel disruption after the 2010 Eyjafjallajökull eruption

A photo of Eyjafjallajökull taken from Route 1 in August 2009

The eruption on 27 March 2010

Around December 2009, seismic activity was detected in the volcano area, with thousands of small earthquakes (mostly magnitude 1–2 on the Richter magnitude scale, with only a couple greater than 3 magnitude) 7–10 kilometres (4.3–6.2 mi) beneath the volcano.[12] On 26 February 2010, unusual seismic activity along with rapid expansion of the Earth’s crust was registered by the Meteorological Institute of Iceland.[13] This gave geophysicists evidence that magma was pouring from underneath the crust into the magma chamber of the Eyjafjallajökull volcano and that pressure stemming from the process caused the huge crustal displacement at Þorvaldseyri farm.[14] The seismic activity continued to increase and from 3–5 March, close to 3,000 earthquakes were measured at the epicentre of the volcano.

The eruption is thought to have begun on 20 March 2010, about 8 kilometres (5.0 mi) east of the top crater of the volcano, on Fimmvörðuháls, the high neck between Eyjafjallajökull and the neighboring icecap, Mýrdalsjökull. This first eruption, in the form of a fissure vent, did not occur under the glacier and was smaller in scale than had been expected by some geologists. The fissure opened on the north side of Fimmvörðuháls, directly across the popular hiking trail between Skógar, south of the pass, and Þórsmörk, immediately to the north.

On 14 April 2010 Eyjafjallajökull resumed erupting after a brief pause, this time from the top crater in the centre of the glacier, causing meltwater floods (also known as jökulhlaup) to rush down the nearby rivers, and requiring 800 people to be evacuated.[4] This eruption was explosive in nature, due to melt water getting into the volcanic vent. It is estimated to be ten to twenty times larger than the previous one in Fimmvörðuháls. This second eruption threw volcanic ash several kilometres up in the atmosphere which led to air travel disruption in northwest Europe for six days from 15 April and in May 2010, including the closure of airspace over many parts of Europe.[15] The eruptions also created electrical storms.[16] On 23 May 2010, the London Volcanic Ash Advisory Commission declared the eruption to have stopped, but are continuing to monitor the volcano.[17] The volcano continues to have several earthquakes daily, with Volcanologists watching the volcano closely.[18] Only when activity has ceased for three months will it be considered dormant.[19]

[edit] Eyjafjallajökull and Katla

Eyjafjallajökull in March 2006, viewed from a recreation area on the Sólheimajökull, a glacier on the Katla volcano

North view of (from left to right) Mýrdalsjökull, Fimmvörðuháls and Eyjafjallajökull on 4 April 2010, taken from an altitude of 10,000 metres (32,800 ft)

Eyjafjallajökull lies 25 km[20] west of another subglacial volcano, Katla, under the Mýrdalsjökull ice cap, which is much more active and known for its powerful subglacial eruptions and its large magma chamber. Each of the eruptions of Eyjafjallajökull in 920, 1612, and 1821-1823 has preceded an eruption of Katla.[21] Katla has not displayed any unusual activity (such as expansion of the crust or seismic activity) during the 2010 eruptions of Eyjafjallajökull, though geologists have been concerned about the general instability of Katla since 1999. Some geophysicists in Iceland believe that the Eyjafjallajökull eruption may trigger an eruption of Katla, which would cause major flooding due to melting of glacial ice and send up massive plumes of ash.[21][22] On 20 April 2010 Icelandic President Ólafur Grímsson said “the time for Katla to erupt is coming close…we [Iceland] have prepared…it is high time for European governments and airline authorities all over the world to start planning for the eventual Katla eruption”.[23]

As of June 2010, volcanologists are continuing to monitor Katla, aware that any eruption from Katla following an eruption from Eyjafjallajökull has historically occurred within months of an Eyjafjallajökull eruption. The Icelandic Meteorological Office updates its website with reports of quakes both at Eyjafjallajökull and Katla[18]

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