The British Geological Survey recorded
a Magnitude 1.4 Earthquake at a depth of about 3 km beneath the town of Dumfries in southwest Scotland,
slightly before 2.15 pm British Summertime (slightly after 2.15 am GMT)
on Monday 11 May 2015. This was not a major event, and presented no
threat to human life or property, but may have been felt locally.
The approximate location of the 11 May 2015 Dumfries. Google Maps.
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 and the northwest of Wales being more prone to quakes
than the rest of Wales or most of England.
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.
(Top) Simplified diagram showing principle of glacial rebound. Wikipedia.
(Bottom) Map showing the rate of glacial rebound in various parts of
the UK. Note that some parts of England and Wales show negative values,
these areas are being pushed down slightly by uplift in Scotland, as the
entire landmass is quite rigid and acts a bit like a see-saw. Climate North East.
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.
See also...
The British Geological Survey
recorded a series of three Earthquakes about 10 km off the south coast
of the Isle of Arran in southwest Scotland on Saturday 28-Sunday 29 June
2014. The first event happened slightly after...
Magnitude 1.4 Earthquake near Dumfries, southwest Scotland. The British Geological Survey
recorded a Magnitude 1.4 Earthquake at a depth of 6 km, toughly 2 km to
the northwest of Dumfries in southwest Scotland...
The British Geological Survey
recorded a Magnitude 1.3 Earthquake at a depth of about 7 km, roughly 1
km off...
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