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This would have cooled temperatures in the northern parts of the globe for a few years afterwards.
Initially a 2–4 cm layer of tephra was deposited over Austur-Húnavatnssýsla and Skagafjördur, resulting in the deaths of both fish and livestock.In late 1389 Hekla erupted again (VEI 3), starting with a large ejection of tephra to the southeast.Later "the eruption fissure moved itself out of the mountain proper and into the woods a little above Skard".But there is a general correlation: the longer Hekla goes dormant, the larger and more catastrophic its opening eruption will be.of volcanic rock into the atmosphere, placing its Volcanic Explosivity Index (VEI) at 5.The volcano's frequent large eruptions have covered much of Iceland with tephra, and these layers can be used to date eruptions of Iceland's other volcanoes.
Approximately 10% of the tephra created in Iceland in the last thousand years has come from Hekla, amounting to 5 km A poem by the monk Benedeit from circa 1120 about the voyages of Saint Brendan mentions Hekla as the prison of Judas.This fissure opens along its entire length during major eruptions and is fed by a magma reservoir estimated to have a top 4 km below the surface with centroid 2.5 km lower.The tephra produced by its eruptions is high in fluorine, which is poisonous to animals.Rangárvellir, Land and Hreppar also suffered damage.During the eruption up to 0.5 m lava bombs were thrown 15–20 km away, and flooding was caused by the sudden melting of snow and ice on Hekla's slopes.is a stratovolcano in the south of Iceland with a height of 1,491 m (4,892 ft).