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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Though severe earthquakes in the north of France and Britain are rare, the Dover Straits earthquake of 6 April 1580 appears to have been one of the largest in the recorded history of England, Flanders or northern France. It occurred about 6 o'clock in the evening. A study undertaken during the design of the Channel Tunnel estimated the magnitude of the 1580 quake at 5.3-5.9ML and its focal depth at 20-30 km, in the lower crust. Being relatively deep, the quake was felt over a large area and it is not certain where the epicentre was located. The Channel Tunnel study proposed three possible locations, two south of Calais and one offshore. The barycentre of the isoseismals with intensities IV to VII lies in the Boulonnais, 10 km east of Desvres, the barycentre of the VII isoseismal lies about 1 km northeast of Ardres, and the barycentre of the only pleistoseismal zone lies in the English Channel.

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