Photographer's Note

Hvannadalshnśkur or Hvannadalshnjśkur is a peak in the north-western rim of the Öręfajökull and the Grimsvotn volcano in Iceland and the highest point of the island.

An official measurement completed in August 2005 established its height as 2,109.6 m (previously set as 2,119 m).

The peak is part of the Skaftafell National Park. The route to the top is a popular climb though numerous and frequently hidden crevasses call for experienced mountain guides.

Jökulhlaup: eruptions under the icecap regularly give rise to glacial bursts, known in Icelandic as jökulhlaups. Eruptions may melt enough ice to fill the Grķmsvötn caldera with water, and the pressure may be enough to suddenly lift the icecap, allowing huge quantities of water to escape rapidly. As a result, the Grķmsvötn caldera is monitored very carefully by scientists. When a large eruption occurred in 1996, geologists knew well in advance that a glacial burst was imminent. It didn't occur until several weeks after the eruption finished, but the monitoring allowed the closing of the Icelandic ring road (Hringvegur) when the burst occurred. A section of road across the Skeišarį sandur was washed away in the ensuing flood, but no-one was hurt.

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Additional Photos by Michel Detay (mdetay) Gold Star Critiquer/Gold Note Writer [C: 485 W: 1 N: 1031] (4881)
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