Tjörnes Fracture Zone (Iceland): earthquake swarm as result of possible magma intrusion

Tue, 1 Oct 2013, 16:06 | BY: T

Location of recent quakes at the TFZ

Depth vs time of earthquakes at the TFZ

An intense earthquake swarm has been going on offshore North Iceland, 10 km NW of Gjögurtá, since 25 September. This morning, 2 earthquakes reaching magnitude 3 and 3.2 occurred at 06:14 and 07:41. In total, more than 1000 quakes have been recorded by 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.

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Information about: Tjörnes Fracture Zone volcano

Previous news

Fri, 2 Aug 2013, 04:32

Tjörnes Fracture Zone (Iceland): earthquake swarm

A (probably tectonic) swarm of earthquakes has been occurring since yesterday in the eastern part of the TFZ, about 10-15 km north of the shore at various depths mostly below 15 km. It includes more than 100 quakes yesterday including 6 above magnitude 3 (up to 3.8 yesterday morning). ... Read all

Mon, 8 Apr 2013, 15:39

Tjörnes Fracture Zone volcano (North of Iceland) activity update

The seismic swarm continues with a decreasing trend. "Only" 65 earthquakes have been counted so far today, the largest being a 3.3 event 14 km NE of Grímsey this morning. ... Read all