Though severe earthquakes in Britain and northern France are rare, the 1580 Dover Straits earthquake appears to have been one of the largest in the recorded history of England, Flanders or northern France. Its effects started to be felt in London at around six o'clock in the evening of 6 April 1580, being Wednesday in the Easter week.
A study undertaken during the design of the Channel Tunnel estimated the magnitude of the 1580 quake at 5.3–5.9 ML and its focal depth at 20–30 km, in the lower crust. The Channel Tunnel was therefore designed to withstand those tremors. 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.
The British Geological Survey estimates the magnitude to be 5.7–5.8 ML.
The earthquake is well recorded in contemporary documents, including the "earthquake letter" from Gabriel Harvey to Edmund Spenser mocking popular and academic methods of accounting for the tremors. It fell during Easter week, an omen-filled connection that was not lost on the servant-poet James Yates, who wrote ten stanzas on the topic:
Oh sudden motion, and shaking of the earth,
No blustering blastes, the weather calme and milde:
Good Lord the sudden rarenesse of the thing
A sudden feare did bring, to man and childe,
They verely thought, as well in field as Towne,
The earth should sinke, and the houses all fall downe.
Well let vs print this present in our heartes,
And call to God, for neuer neede we more:
Crauing of him mercy for our misdeedes,
Our sinfull liues from heart for to deplore,
For let vs thinke this token doth portend,
If scourge nere hand, if we do still offend.
Yates' poem was printed in 1582 in The Castell of Courtesy.
English writer Thomas Churchyard, then aged 60, was in London when the quake struck and he drafted an immediate account which was published two days later. In his 2007 biography of Richard Hakluyt, historian Peter C. Mancall provides extensive extracts from Churchyard's 8 April 1580 pamphlet, A Warning to the Wyse, a Feare to the Fond, a Bridle to the Lewde, and a Glasse to the Good; written of the late Earthquake chanced in London and other places, the 6th of April, 1580, for the Glory of God and benefit of men, that warely can walk, and wisely judge. Set forth in verse and prose, by Thomas Churchyard, gentleman. Mancall notes that Churchyard's pamphlet provides a sense of immediacy so often lacking in retrospective writing. According to Churchyard, the quake could be felt across the city and well into the suburbs, as "a wonderful motion and trembling of the earth" shook London, and "Churches, Pallaces, houses, and other buildings did so quiver and shake, that such as were then present in the same were toosed too and fro as they stoode, and others, as they sate on seates, driven off their places."