Thordarhyrna Volcano
Updated: Apr 20, 2024 01:55 GMT -
subglacial volcano 1650 m / 5413 ft
Southern Iceland, 64.27°N / -17.62°W
Current status: normal or dormant (1 out of 5)
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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Thordarhyrna volcano eruptions: 1902-04, 1887, 1823
Latest nearby earthquakes
| Time | Mag. / Depth | Distance / Location | |||
| Apr 16, 03:49 pm (Reykjavik) | 2.0 1.1 km | 21 km (13 mi) to the NE |  Iceland: 1.6 km S of Grímsfjall | Info | |
| Thursday, April 11, 2024 GMT (1 quake) | |||||
| Apr 11, 12:42 am (Reykjavik) | 2.3 6.3 km | 27 km (17 mi) to the NE | 8.9 km NNW of Grímsfjall | Info | |
| Saturday, April 13, 2024 GMT (1 quake) | |||||
| Apr 13, 04:06 pm (Reykjavik) | 1.6 3.5 km | 2 km (1.3 mi) to the NE | 20.5 km SW of Grímsfjall | Info | |
| Tuesday, April 16, 2024 GMT (1 quake) | |||||
| Apr 16, 05:01 am (Reykjavik) | 1.5 5 km | 28 km (18 mi) to the N | 14.0 km NW of Grímsfjall | Info | |
| Monday, April 15, 2024 GMT (1 quake) | |||||
| Apr 15, 01:44 am (Reykjavik) | 1.5 3.5 km | 27 km (17 mi) to the N | 5.5 km ENE of Hamarinn | Info | |
| Wednesday, April 10, 2024 GMT (1 quake) | |||||
| Apr 10, 09:04 pm (Reykjavik) | 1.5 5.4 km | 21 km (13 mi) to the N | 6.6 km ESE of Hamarinn | Info | |
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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