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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » ATMOSPHERIC CHANGES » Intense earthquake swarm offshore North Iceland - 1 000 quakes in 6 days

Intense earthquake swarm offshore North Iceland - 1 000 quakes in 6 days

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Intense earthquake swarm offshore North Iceland - 1 000 quakes in 6 days

Posted by Adonai on October 01, 2013 in categories Seismic activity, Volcanoes





An intense earthquake swarm has been going on offshore North Iceland, 10 km NW of Gjögurtá, since September 25, 2013. This morning, 2 earthquakes reaching magnitude 3 and 3.2 occurred at 06:14 and 07:41 UTC. Roughly 1 000 earthquakes have been recorded by Icelandic Meteorological Office in last 6 days (IMO).
The depths of the quakes vary from about 15 km depth (crust-mantle boundary) to near surface. The area is located on an active fault line related to rifting, and a possible cause of the earthquake swarm could be a magmatic intrusion at Tjörnes Fracture Zone volcano (VD).

University of Iceland © Icelandic Meteorological Office
Image above: Map of relative locations, September 25 to October 1, 2013 offshore North Iceland. Roughly 1000 earthquakes have been recorded in the swarm. Topography of seabed: Bryndís Brandsdóttir, Institute of Earth Sciences, University of Iceland.

Location of recent quakes with relation to Tjörnes Fracture Zone volcano. Image credit: Google Earth/Volcano Discovery
Iceland earthquake swarm map - October 1, 2013. Image credit: IMO
The offshore Tjörnes Fracture Zone is an oblique transform zone that separates the northern volcanic zone of Iceland from the Kolbeinsey Ridge, part of the Mid-Atlantic Ridge north of Iceland. A submarine eruption was reported during 1867-1868 at the SE part of the fissure system off the northern coast of Iceland along the Manareyjar Ridge immediately north of Manareyjar Island (GVP).
Featured image: Iceland earthquake swarm map - October 1, 2013. Image credit: IMO

Thanks to: http://thewatchers.adorraeli.com



  

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