Just over a week ago teacups started to rattle across southwest Britain, when a magnitude 4.1 earthquake struck the Bristol Channel. In the UK such a quake is newsworthy: magnitude four quakes occur roughly once every three or four years. Magnitude fives meanwhile, occur approximately every twenty years – the last one being the magnitude 5.2 Market Rasen earthquake in Lincolnshire, which shook a large area and caused one chimney to collapse.Compa ...
http://www.theguardian.com/science/2014/feb/28/earthwatch-earthquake-b
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