An Earthquake swarm started in northern Iceland during the night to the 21th.
Images taken from http://en.vedur.is/earthquakes-and-volcanism/earthquakes/
islander says: October 21, 2012 at 01:44
Quite heavy earthquake swarm in North of Iceland, Siglufjörður region and tjörnes Rift Zone. Currently 31 quake larger than 3 Richter (them stars), several over 4. Some broken windows and Church bells ringing themselves have been reported. No serious damage yet, but this can go on all night long.
(Likely there are lots of Ghost quakes on map, but VC gang, this is such times we can swamp IMO servers if not careful, so use website sparingly, I only use one tab at a time watching, refreshing only now or then) And I felt a quake here, seems there has been some larger than that, perhaps close to five, according to strain meters at Hek and Bur …)
As reader Kobba pointed out this swarm is best seen on http://www.vedur.is/skjalftar-og-eldgos/jardskjalftar/tjornesbrot_litid/
At 3 am blog time the count ran over 50 quakes stronger than Magnitude 3. Those quakes seem to be tectonic quakes as long as there is no current volcanic activity known in the area. Many of the quakes might be ghosts which might get removed later. The largest quake was upgraded to a 5,7.
Some quakes also appeared on the list of the Potsdam Insitute of Geophysics http://geofon.gfz-potsdam.de/eqinfo/list.php
And here is the beachball of one of those quakes. http://geofon.gfz-potsdam.de/data/alerts/2012/gfz2012urgs/mt.txt
( Links provided by reader arjanemm )
Oliver St John-Mollusc says: October 21, 2012 at 08:58
Google translation of RUV (Iceland’s “BBC”) article:
Hundreds of earthquakes have been recorded yesterday, last night and this morning outside Siglufjörður. The largest was the second time in the night, 5.2 in size. Human habitations quaking in Akureyri, dogs rushed up óhljóðum and items moved from one place. People were troubled, according to reporters in the north.
No reports have been received of injuries, however, people or property. Several other earthquakes have been recorded over four dozens of tremors over three large. Bergthora Thorbjarnardottir, geophysicist at the Meteorological Institute, says a shaky offense that is not preceded volcanic activity. The epicenter is about twenty miles north of the town accounted for, at 6-9 kilometers.
Earthquake had begun the previous night 20 km north SIGLUFJORDUR. Activity has come in waves but calm was between 15 and 23 o’clock yesterday. Furthermore, the cycle may come back with great force. She says that the area has calmed down tonight but it is not possible to predict whether earthquakes recurrence. The last quake of three large measured shortly before seven in the morning. He was of size 3.5 according óyfirfarinni automatic measurement. You can monitor the earthquake on site certified.
Bergthora says shaking Tjörnes Seismic Zone could reach up to seven large. It can not be excluded a large tremor, but there is no evidence, however, especially for a large earthquake is coming.
Earthquakes were well over the north and west, to form a Blönduósi in Fnjóskadal, Sauðárkrókur in Staircase,-exhibition, in Isafjordur, in dollars, in Húnaþing and Reykjadalur.
Earthquakes are common in this area but has not previously been so dramatic cycles in this place.
Lets not get overexcited and leave the delicate links to the Icelanders so we dont bring them down by swarming them.
Please leave news as comments below. This post will most likely be updated a few times today.
Update1 : Oliver St John-Mollusc pointed out:
As it shows little or no heightening to speak of in especially the red (0.5 – 1 Hz), it indicates there is little to no magmatic component, thus it all appears to be tectonic in nature.