1275 British Earthquake
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On 11 September 1275, an earthquake struck the south of
Great Britain Great Britain is an island in the North Atlantic Ocean off the north-west coast of continental Europe, consisting of the countries England, Scotland, and Wales. With an area of , it is the largest of the British Isles, the List of European ...
. The epicentre is unknown, although it may have been in the
Portsmouth Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
/
Chichester Chichester ( ) is a City status in the United Kingdom, cathedral city and civil parish in the Chichester District, Chichester district of West Sussex, England.OS Explorer map 120: Chichester, South Harting and Selsey Scale: 1:25 000. Publisher ...
area on the south coast of England or in
Glamorgan Glamorgan (), or sometimes Glamorganshire ( or ), was Historic counties of Wales, one of the thirteen counties of Wales that existed from 1536 until their abolishment in 1974. It is located in the South Wales, south of Wales. Originally an ea ...
, Wales. The earthquake is known for causing the destruction of St Michael's Church on
Glastonbury Tor Glastonbury Tor is a hill near Glastonbury in the English county of Somerset, topped by the roofless tower of St Michael's Church, a Grade I Listed building (United Kingdom), listed building. The site is managed by the National Trust and has be ...
in
Somerset Somerset ( , ), Archaism, archaically Somersetshire ( , , ) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east ...
.


Earthquake

The
annals Annals (, from , "year") are a concise history, historical record in which events are arranged chronology, chronologically, year by year, although the term is also used loosely for any historical record. Scope The nature of the distinction betw ...
of Waverley in
Surrey Surrey () is a Ceremonial counties of England, ceremonial county in South East England. It is bordered by Greater London to the northeast, Kent to the east, East Sussex, East and West Sussex to the south, and Hampshire and Berkshire to the wes ...
report that the earthquake occurred "between the first hour of the day and the third" on 11 September 1275. It was felt in
London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
,
Canterbury Canterbury (, ) is a City status in the United Kingdom, city and UNESCO World Heritage Site, in the county of Kent, England; it was a county borough until 1974. It lies on the River Stour, Kent, River Stour. The city has a mild oceanic climat ...
,
Winchester Winchester (, ) is a City status in the United Kingdom, cathedral city in Hampshire, England. The city lies at the heart of the wider City of Winchester, a local government Districts of England, district, at the western end of the South Downs N ...
and
Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
, and may have been felt across the rest of England. One account described how it was felt "chiefly in
the west West is a cardinal direction or compass point. West or The West may also refer to: Geography and locations Global context * The Western world * Western culture and Western civilization in general * The Western Bloc, countries allied with NAT ...
". Neither
foreshock A foreshock is an earthquake that occurs before a larger seismic eventthe mainshockand is related to it in both time and space. The designation of an earthquake as ''foreshock'', ''mainshock'' or aftershock is only possible after the full sequenc ...
s nor
aftershock In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in Epicenter, the same area of the Mainshock, main shock, caused as the displaced Crust (geology), crust adjusts to the effects of the main shock. Large earthq ...
s are reported as having occurred. The earthquake caused the destruction of the 11th-century timber Church of St Michael atop
Glastonbury Tor Glastonbury Tor is a hill near Glastonbury in the English county of Somerset, topped by the roofless tower of St Michael's Church, a Grade I Listed building (United Kingdom), listed building. The site is managed by the National Trust and has be ...
. It is likely that other buildings across the country were destroyed, and the annals of Osney reported that people were killed in the earthquake—"''domus et ecclesiae in diversis locis Angliae subvertebantur et homines interficiebantur''" ("homes and churches in different areas of England
ere Ere or ERE may refer to: * ''Environmental and Resource Economics'', a peer-reviewed academic journal * ERE Informatique, one of the first French video game companies * Ere language, an Austronesian language * Ebi Ere (born 1981), American-Nigeria ...
overthrow the people being killed"). The annals of Winchester state that the tremors were felt across the sea, which may imply it was felt in
France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
, although the lack of corroboration from French sources may suggest this is a confusion with a different event. One account described how "a great earthquake happened in many kingdoms, and chiefly in England, and floods of water also about maritime towns". Similarly,
Walter de Hemingburgh Walter of GuisboroughWalter of Gisburn, Walterus Gisburnensis. Previously known to scholars as Walter of Hemingburgh (John Bale seems to have been the first to call him that).Sometimes known erroneously as Walter Hemingford, Latin chronicler of t ...
observed that "there was a general earthquake in London and in the kingdom of England, both in camps and towns, habitations and fields". It is possible that the coastal effects of the earthquake are better attributed to unrelated inclement weather, as the word "earthquake" may have archaically referred to
thunder Thunder is the sound caused by lightning. Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning pr ...
. The
British Geological Survey The British Geological Survey (BGS) is a partly publicly funded body which aims to advance Earth science, geoscientific knowledge of the United Kingdom landmass and its continental shelf by means of systematic surveying, monitoring and research. ...
hypothesises that the extent and spread of damage suggests an intensity of at least 7 on the
Medvedev–Sponheuer–Karnik scale The Medvedev–Sponheuer–Karnik scale, also known as the MSK or MSK-64, is a macroseismic intensity scale used to evaluate the severity of ground shaking on the basis of observed effects in an area where an earthquake transpires. The scale was f ...
("very strong"), or 8 on the
European macroseismic scale The European Macroseismic Scale (EMS) is the basis for evaluation of seismic intensity in European countries and is also used in a number of countries outside Europe. Issued in 1998 as an update of the test version from 1992, the scale is referred ...
("heavily damaging").


Epicentre

The
epicentre The epicenter (), epicentre, or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates. Determination The primary purpose of a s ...
of the earthquake is unknown. Despite contemporary reports that assume the damage at Glastonbury Tor prove a
Somerset Somerset ( , ), Archaism, archaically Somersetshire ( , , ) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east ...
epicentre, it is unlikely that the epicentre was in the county, and the destruction of the church is more likely attributed to the church's exposed position atop a steep and narrow hill. A possible location is in the area of
Portsmouth Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
and
Chichester Chichester ( ) is a City status in the United Kingdom, cathedral city and civil parish in the Chichester District, Chichester district of West Sussex, England.OS Explorer map 120: Chichester, South Harting and Selsey Scale: 1:25 000. Publisher ...
. This area is notable for frequency of earthquakes due to the presence of a deep north–south
strike-slip fault In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...
. This hypothesis is strengthened by the report of Thomas Wykes, who wrote that the shock was more intense on the south coast. A possible alternative epicentre is in
South Wales South Wales ( ) is a Regions of Wales, loosely defined region of Wales bordered by England to the east and mid Wales to the north. Generally considered to include the Historic counties of Wales, historic counties of Glamorgan and Monmouthshire ( ...
. Edward Gamage, the rector in
St Athan St Athan () is a village and community (Wales), community in the Vale of Glamorgan in South Wales. The village and its parish church are dedicated to Saint Tathan. The church dates to the 13th–14th century, though an earlier church was dated t ...
,
Glamorgan Glamorgan (), or sometimes Glamorganshire ( or ), was Historic counties of Wales, one of the thirteen counties of Wales that existed from 1536 until their abolishment in 1974. It is located in the South Wales, south of Wales. Originally an ea ...
, described an earthquake causing immense damage to Glamorgan and Somerset. Gamage, an antiquarian in the 18th century, wrote a history of the Strandling family of
Bristol Bristol () is a City status in the United Kingdom, cathedral city, unitary authority area and ceremonial county in South West England, the most populous city in the region. Built around the River Avon, Bristol, River Avon, it is bordered by t ...
where he described the earthquake as occurring in the time of Sir John Strandling, which is probably the same as the 1275 event. This suggests an epicentre closer to
Swansea Swansea ( ; ) is a coastal City status in the United Kingdom, city and the List of urban areas in the United Kingdom, second-largest city of Wales. It forms a Principal areas of Wales, principal area, officially known as the City and County of ...
and implies a magnitude of 6 Mw. Some sources cite the earthquake as being a Cornish or French event, mistaking a reference to the destruction at "St Michael on the Mount" (the church on Glastonbury Tor) for occurring at
St Michael's Mount St Michael's Mount (, meaning "Hoarfrost, hoar rock in woodland") is a tidal island in Mount's Bay near Penzance, Cornwall, England, United Kingdom. The island is a Civil parishes in England, civil parish and is linked to the town of Marazion ...
or
Mont-Saint-Michel Mont-Saint-Michel (; Norman: ''Mont Saint Miché''; ) is a tidal island and mainland commune in Normandy, France. The island lies approximately off France's north-western coast, at the mouth of the Couesnon River near Avranches and is in ...
. The annals of Waverley refer to an earthquake affecting the whole country and destroying the church called "St Michael of heMount", although no specific mention of the location of the church is made.


References

{{Historical earthquakes (1000–1500) 1275 in England 13th-century earthquakes Earthquakes in the United Kingdom 13th century in England 13th century in Wales