Posted on 09/18/2008

Photo taken on August 20, 2008

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Going around the volcano

Going around the volcano
Hekla erupts a magma type that is unique for Iceland, intermediate between highly silicic and andesitic composition. From surface deformation studies after the 1980 eruption, it has been concluded that its magma chamber is located around 8 km below the summit. Since the Middle Ages, Hekla's has been one of the most active volcanoes of the world, with recorded major eruptions in 1104, 1158, 1206, 1222, 1300, 1341, 1389, 1510, 1597, 1636, 1693, 1766, 1845, 1947, 1970, 1980, 1991 and 2000. Typically, at least the beginning parts of Hekla's eruptions are largely explosive. Some of these eruptions caused great damage, especially the eruptions in 1510, 1693 and 1766. Note that since 1970 the repose interval appears to have changed, becoming much shorter and quite regular, around 10 years, with respect to an approximately 50 years rhythm during the preceding centuries.

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