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Thordarhyrna volcano

subglacial volcano 1650 m / 5413 ft
Southern Iceland, 64.27°N / -17.62°W
Current status: normal or dormant (1 out of 5) | Reports
Thordarhyrna volcano books
Typical eruption style: explosive
Thordarhyrna volcano eruptions: 1902-04, 1887, 1823
TimeMag. / DepthDistanceLocation
Wed, 1 Apr 2020
Wed, 1 Apr 20:23 UTCM 0.4 / 0.1 km8 km18.2 km WSW of Grímsfjall (Iceland)
Thordarhyrna (Þórðarhyrna) is one of seven active subglacial volcanoes beneath the Vatnajokull glacier in southeastern Iceland. It last has erupted in 1903.

Background:

The Thordarhyrna (Þórðarhyrna) central volcano has been moderately active during the past 10,000 years. It is the second and less active central volcano of the Grímsvötn-Laki volcanic system, located about 20 km SW of the more active Grímsvötn central volcano and connected to it by a subglacial mountain ridge.
The volcano has a diameter of 15 km, and is covered by ice 100-600 m thick within the Vatnajökull glacier. The last eruption occurred in 1903 CE. The recent activity has been explosive (phreatomagmatic) basaltic eruptions with tephra volumes ranging from 0.01-1 km3, but several rhyolitic nunataks characterize this volcano. Eruptions are accompanied by jökulhlaups (glacial floods). Being the only second central volcano on a volcanic system with considerable historical volcanic activity, Þórðarhyrna is treated as an independent volcano although the fissure swarm events are shared with the Grímsvötn system.
Source: GVP


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