The volcanic lakes, Grímsvötn for example, were the sources of a large glacier run in 1996.

The volcanic lakes, Grímsvötn for example, were the sources of a large glacial lake outburst flood in 1996.

By 31 July the jokulhlaup had subsided with conductivity measurements and tremor slowly reaching normal levels.

By 31 July the jökulhlaup had subsided with conductivity measurements and tremor slowly reaching normal levels.

When the volcanoes erupt; the glacier ice above them melts very quickly, creating devastatingly destructive rivers called jökulhlaup, or a 'glacier run'.

In July 1998 a GLOF in the Shahimardan valley of Kyrgyzstan and Uzbekistan killed over 100 people.

On 2 October IMO noted that the jökulhlaup was possibly the largest to have occurred from the Skaftá cauldrons.

During an eruption, the ice melts abruptly in contact with the heat, causing huge catastrophic floods called Jökulhlaup, taking everything with them.

In July 1998 a GLOF in the Shahimardan valley of Kyrgyzstan and Uzbekistan killed over 100 people.

In July 1998 a GLOF in the Shahimardan valley of Kyrgyzstan and Uzbekistan killed over 100 people.

It’s worth noting, however, that the 2011 event produced a “jökulhlaup”, a flash flood caused by part of the glacier melting.

Another in August 2002 in the Shakhdara valley of the Tajik Pamir mountains claimed 23 lives.

Pay attention to your guide when he / she starts speaking of "Jökulhlaup" and you see enormous devastated areas of sandy plains and ash.

Of course, science is constantly improving, and nowadays areas can be cleared and monitored if a jökulhlaup is even suspected.

A minor eruption in 1927 that produced a large jökulhlaup is the only known historical activity from Esjufjöll.