Askja volcano

Stratovolcano 1516 m (4,974 ft)
Central Iceland, 65.03°N / -16.75°W
Current status: restless (2 out of 5)
Last update: 17 Sep 2021 (Volcanic Ash Advisory)

Askja is a large basaltic central volcano that forms the Dyngjufjöll massif. It is truncated by three overlapping calderas, the largest of which is 8 km wide and may have been produced primarily from subglacial ring-fracture eruptions rather than by subsidence.

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Typical eruption style: explosive + effusive
Askja volcano eruptions: 1797(?), 1875, 1919, 1921, 1922, 1923, 1924(?), 1926, 1938, 1961

TimeMag. / DepthDistance/Location
Wednesday, October 13, 2021 08:03 GMT (3 earthquakes)
Oct 13, 2021 8:03 am (GMT +0) (Oct 13, 2021 08:03 GMT)
1.8

1 km
37 km (23 mi)
Iceland: 6.0 Km WNW of Herðubreiðarfjöll
Oct 13, 2021 8:02 am (GMT +0) (Oct 13, 2021 08:02 GMT)
2.6

1.8 km
37 km (23 mi)
Iceland: 5.1 Km NW of Herðubreiðarfjöll
Oct 13, 2021 7:58 am (GMT +0) (Oct 13, 2021 07:58 GMT)
1.8

1.4 km
37 km (23 mi)
Iceland: 5.8 Km WNW of Herðubreiðarfjöll

Background

A major rhyolitic explosive eruption from Dyngjufjöll about 10,000 years ago was in part associated with the formation of Askja caldera. Many postglacial eruptions also occurred along the ring-fracture. A major explosive eruption on the SE caldera margin in 1875 was one of Iceland's largest during historical time. It resulted in the formation of a smaller 4.5-km-wide caldera, now filled by Öskjuvatn lake, that truncates the rim of the larger central caldera. The 100-km-long Askja fissure swarm, which includes the Sveinagja graben, is also related to the Askja volcanic system, as are several small shield volcanoes such as Kollatadyngja. Twentieth-century eruptions at Askja have produced lava flows from vents located mostly near Öskjuvatn lake.

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Source: GVP, Smithsonian Institution

Askja Photos

Viti crater and lake Öskjuvatn fill only a part of the enormous Askja caldera in Iceland. (Photo: Janka)
Viti crater and lake Öskjuvatn fill only a part of the enormous Askja caldera in Iceland. (Photo: Janka)
Askja caldera with its sulphurous Viti crater and the deep lake of Öskjuvatn in the background, Iceland (Photo: Janka)
Askja caldera with its sulphurous Viti crater and the deep lake of Öskjuvatn in the background, Iceland (Photo: Janka)
View on the exceptionally clear waters of lake Öskjuvatn, Askja caldera, Iceland (Photo: Janka)
View on the exceptionally clear waters of lake Öskjuvatn, Askja caldera, Iceland (Photo: Janka)
 



See also: Sentinel hub | Landsat 8
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