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Thordarhyrna volcano

Updated: Nov 29, 2023 03:01 GMT -
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
Friday, November 24, 2023 GMT (1 quake)
Nov 24, 11:47 pm (Reykjavik)
(Nov 24, 23:47 GMT)

2.6 km
24 km (15 mi)
Iceland: 6.9 Km NW of Grímsfjall
Thursday, November 23, 2023 GMT (2 quakes)
Nov 23, 11:57 pm (Reykjavik)
(Nov 23, 23:57 GMT)

6.5 km
27 km (17 mi)
Iceland: 2.0 Km NE of Hamarinn
Nov 23, 09:55 pm (Reykjavik)
(Nov 23, 21:55 GMT)

0.1 km
22 km (14 mi)
Iceland: 0.3 Km W of Grímsfjall
Wednesday, November 22, 2023 GMT (1 quake)
Nov 22, 11:31 pm (Reykjavik)
(Nov 22, 23:31 GMT)

1.3 km
27 km (17 mi)
Iceland: 4.2 Km NE of Grímsfjall
Sunday, November 19, 2023 GMT (1 quake)
Nov 19, 09:57 pm (Reykjavik)
(Nov 19, 21:57 GMT)

3.3 km
21 km (13 mi)
Iceland: 1.1 Km SW of Grímsfjall


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 | NASA FIRMS

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