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)

Thordarhyrna (Þórðarhyrna) is one of seven active subglacial volcanoes beneath the Vatnajokull glacier in southeastern Iceland. It last has erupted in 1903.

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Typical eruption style: explosive
Thordarhyrna volcano eruptions: 1902-04, 1887, 1823

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Mon, 2 Aug 2021 (GMT) (3 earthquakes)
2 Aug 2021 16:22:16 GMT

2.1 km
0.7 km (0.4 mi)
Iceland: 21.8 Km SW of Grímsfjall
2 Aug 2021 14:25:11 GMT

5.3 km
20 km (12 mi)
Iceland: 7.5 Km SE of Hamarinn
2 Aug 2021 09:54:29 GMT

0.4 km
28 km (17 mi)
Iceland: 5.3 Km NE of Grímsfjall
Sun, 1 Aug 2021 (GMT) (2 earthquakes)
1 Aug 2021 06:18:30 GMT

19 km
43 km (27 mi)
Iceland: 19.2 Km NNE of Grímsfjall
1 Aug 2021 06:08:12 GMT

18 km
41 km (25 mi)
Iceland: 17.8 Km ESE of Bárðarbunga


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

See also: Sentinel hub | Landsat 8
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