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Map of recent quakes under Torfajökull (Iceland Met Office)
Sunday, Feb 17, 2013
A small earthquake swarm has started today. It includes about 20 quakes of small magnitude at shallow depths of 2-4 km. ... [more]

 

Torfajökull volcano

Stratovolcano 1259 m / 4,131 ft
Iceland, 63.93°N / -19.18°W
Current status: normal or dormant (1 out of 5) | Reports
Torfajökull volcano books
Last update: 16 May 2018 (earthquake swarm)
Typical eruption style:

Effusive and explosive.


Torfajökull volcano eruptions: ca. 900 AD, 1170(?), 1477
TimeMag. / DepthDistanceLocation
Mon, 17 Dec
Mon, 17 Dec 16:15 UTCM 1.6 / 9.7 km7 km2.8 km W of Básar
Mon, 17 Dec 04:51 UTCM 1.5 / 10.3 km10 km9.4 km ENE of Hekla
Mon, 17 Dec 04:51 UTCM 1.0 / 9.4 km9 km9.4 km E of Hekla
Mon, 17 Dec 01:20 UTCM 1.2 / 4.4 km3 km11.4 km SW of Básar
Mon, 17 Dec 01:20 UTCM 0.6 / 4.1 km3 km11.3 km SW of Básar
View all recent quakes
The Torfajökull central volcano, located north of Myrdalsjökull and south of Thorisvatn lake, is cut by a 12-km-wide caldera that formed during the Pleistocene.

Background:

Torjajokull consists of the largest area of silicic and intermediate volcanism in Iceland; about 225 cu km of silicic extrusive rocks are exposed. The dominantly rhyolitic complex rises about 500 m above surrounding basaltic plains and is elongated in a WNW-ESE direction. Most rhyolitic lava flows were erupted subglacially, forming silicic hyaloclastites that form ridge and dome-shaped breccias.

During postglacial times only a narrow fissure zone at the western end has been active, producing mostly silicic lava flows, lava domes, and tephras. The most recent silicic eruption produced the Hrafntinnuhraun lava flow about 900 AD. The fissure system is along trend with and was active at the same time as the basaltic Veidivötn fissure system of Bárdarbunga central volcano in 1477 AD. The small Torfajökull icecap lies mostly outside the SE rim of the caldera, which is the site of vigorous thermal activity over a broad area of 130-140 sq km.

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Source: GVP, Smithsonian Institute


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