Þórðarhyrna
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Thordarhyrna ( is, Þórðarhyrna ) is one of seven
subglacial volcano A subglacial volcano, also known as a glaciovolcano, is a volcanic form produced by subglacial eruptions or eruptions beneath the surface of a glacier or ice sheet which is then melted into a lake by the rising lava. Today they are most ...
es beneath the Vatnajokull glacier Iceland.


Eruptions

It last erupted in 1910 and prior to that in 1903. An eruption in 3550 BC ± 500 years poured out 150,000,000 cubic meters of lava in the area Bergvatnsárhraun to the south of Thordarhyrna. An eruption between 1887 and 1889 had a VEI of 2.


Geology

There is a mechanical interaction between Thordarhyrna and Grimsvötn, despite these volcanoes being relatively far apart, so the eruption in 1902 - 1904 was combined with an eruption from Grimsvötn and had a Volcanic Explosivity Index (VEI) of 4. A fault runs (N.35°W) from Thordarhyrna towards Hamarinn, and separates two different tectonic regions.http://www.igsoc.org/login/?returnto=/annals/8/igs_annals_vol08_year1985_pg11-18.pdf Surface and bedrock topography mapped by radio echo sounding


See also

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List of volcanoes in Iceland This list of volcanoes in Iceland includes active and dormant volcanic mountains, of which 18 have erupted since human settlement of Iceland began around 900 AD. __TOC__ List Volcanic zones and systems Iceland has four major volcanic z ...


References

Subglacial volcanoes of Iceland VEI-4 volcanoes {{Volcano-stub