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Volcano Photos

Grimsvotn Volcano, Iceland

 Grimsvotn Volcano, Iceland, Volcano photo


Grimsvotn Volcano, Iceland

An ash plume rises from a new crater near the southern margin of Grimsvotn caldera in November 2004.

Grimsvotn, Iceland's most frequently active volcano in historical time, lies largely beneath the vast Vatnajokull icecap.

The 6 x 8 km wide caldera is the source of frequent jokulhlaups (glacier outburst floods) produced when melting raises the water level high enough to lift its ice dam.

Long NE-SW-trending fissure systems extend from the central volcano, including the noted Laki (Skaftar) fissure, which erupted in 1783.

PHOTO SOURCE: Freysteinn Sigmundsson, 2004 (Nordic Volcanological Center), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.


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