Friday, 28 June 2013

Earthquake near Doncaster.

A Magnitude 1.9 Earthquake occurred at a depth of about 1 km roughly 10 km to the east of Doncaster in South Yorkshire, slightly after 4.50 am British Summertime (slightly after 3.50 am GMT) on Wednesday 26 June 2013, according to the British Geological Survey. This is not large enough to have caused any damage or injuries, but should have been large enough to have been felt; though no one has reported this, possibly due to the early hour at which it happened.

The location of the 26 June Earthquake. Google Maps.

As a rule of thumb Earthquakes become more common as you travel north and west in Great Britain, with the west coast of Scotland being the most quake-prone part of the island. The precise cause of Earthquakes in the UK can be hard to determine; the country is not close to any obvious single cause of such activity such as a plate margin, but is subject to tectonic pressures from several different sources, with most quakes probably being the result of the interplay between these forces.

Britain is being pushed to the east by the expansion of the Atlantic Ocean and to the north by the impact of Africa into Europe from the south. It is also affected by lesser areas of tectonic spreading beneath the North Sea, Rhine Valley and Bay of Biscay. Finally the country is subject to glacial rebound; until about 10 000 years ago much of the north of the country was covered by a thick layer of glacial ice (this is believed to have been thickest on the west coast of Scotland), pushing the rocks of the British lithosphere down into the underlying mantle. This ice is now gone, and the rocks are springing (slowly) back into their original position, causing the occasional Earthquake in the process. 

Witness accounts of Earthquakes can help geologists to understand these events, and the structures that cause them. If you felt this quake, or were in the area but did not (which is also useful information) then you can report it to the British Geological Survey here.


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