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Diaporama

Actualités:

Recent earthquakes under Herdubreid volcano
Monday, Oct 12, 2015
A shallow earthquake swarm has been occurring 25 km NE of the Aksja caldera since Thursday. ... [details]
Wednesday, Jul 23, 2014
A large landslide occurred from the southern wall of the Askja caldera yesterday night. The slide caused a large flood wave in the Öskjuvatn lake that also swept into the famous Viti crater. ... [details]
 

Askja volcan

Stratovolcano 1516 m (4,974 ft)
Central Iceland, 65.03°N / -16.75°W
Condition actuelle: en vigilance - niveau agité (2 sur 5)
Askja webcams / live data
Askja volcano books | Tours
Last update: 12 Oct 2015 (earthquake swarms)
Style éruptif tipique: explosive + effusive
Eruptions du volcan Askja : 1797(?), 1875, 1919, 1921, 1922, 1923, 1924(?), 1926, 1938, 1961
HeureMag. / DepthDistanceLocation
Mon, 21 Aug
Mon, 21 Aug 03:40 UTCM 0.2 / 7.1 km23 km4.0 km NNW of Upptyppingar
Mon, 21 Aug 03:40 UTCM 0.7 / 6.5 km23 km4.2 km NNW of Upptyppingar
Mon, 21 Aug 00:29 UTCM 1.2 / 7.7 km29 km3.8 km WNW of Herðubreiðarlindir
Sun, 20 Aug
Sun, 20 Aug 21:51 UTCM 0.5 / 6.4 km23 km5.3 km NE of Herðubreiðartögl
Sun, 20 Aug 17:43 UTCM 0.4 / 3.6 km15 km13.7 km ESE of Kistufell
Voir tous
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.

Introduction:

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

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