The 1755 Lisbon earthquake, also known as the Great Lisbon earthquake, impacted Portugal, the Iberian Peninsula, and Northwest Africa on the morning of Saturday, 1 November, Feast of All Saints, at around 09:40 local time.[3] In combination with subsequent fires and a tsunami, the earthquake almost completely destroyed Lisbon and adjoining areas. Seismologists estimate the Lisbon earthquake had a magnitude of 7.7[4][5] or greater[6] on the moment magnitude scale, with its epicenter in the Atlantic Ocean about 200km (110nmi; 120mi) west-southwest of Cape St. Vincent, a cape in Algarve region, and about 290km (160nmi; 180mi) southwest of Lisbon.
Chronologically, it was the third known large-scale earthquake to hit the city (following those of 1321 and 1531). Estimates place the death toll in Lisbon around 12,000, making it one of the largest earthquakes in history.
The earthquake accentuated political tensions in Portugal and profoundly disrupted the Portuguese Empire. The event was widely discussed and dwelt upon by European Enlightenmentphilosophers, and inspired major developments in theodicy. As the first earthquake studied scientifically for its effects over a large area, it led to the birth of modern seismology and earthquake engineering.
Earthquake and tsunami
1755 copper engraving showing Lisbon in flames and a tsunami overwhelming the ships in the harbor
The earthquake struck on the morning of 1 November 1755, All Saints' Day. Contemporary reports state that the earthquake lasted from three and a half to six minutes, causing fissures 5 metres (16ft) wide in the city center. Survivors rushed to the open space of the docks for safety and watched as the sea receded, revealing a plain of mud littered with lost cargo and shipwrecks. Approximately 40 minutes after the earthquake, a tsunami engulfed the harbor and downtown area, rushing up the Tagus river[7] "so fast that several people riding on horseback... were forced to gallop as fast as possible to the upper grounds for fear of being carried away." It was followed by two more waves. Candles lit in homes and churches all around the city for All Saints' Day were knocked over, starting a fire that developed into a firestorm which burned for hours in the city, asphyxiating people up to 30 metres (98ft) from the blaze.[8]
A contemporary ex-voto depicts the rescue of a three-year-old from under fallen masonry, under the watchful gaze of Our Lady of the Star
Lisbon was not the only Portuguese city affected by the catastrophe. Throughout the south of the country, in particular the Algarve, destruction was rampant. The tsunami destroyed some coastal fortresses in the Algarve and, at lower levels, it razed several houses. Almost all the coastal towns and villages of the Algarve were heavily damaged, except Faro, which was protected by the sandy banks of Ria Formosa. In Lagos, the waves reached the top of the city walls. Other towns in different Portuguese regions, such as Peniche, Cascais, Setúbal and even Covilhã (which is located near the Serra da Estrela mountain range in central inland Portugal) were visibly affected by the earthquake, the tsunami, or both. The shock waves of the earthquake destroyed part of Covilhã's castle walls and its large towers and damaged several other buildings in Cova da Beira,[9][10] as well as in Salamanca, Spain. In Setúbal, parts of the Fort of São Filipe de Setúbal were damaged.
On the island of Madeira, Funchal and many smaller settlements suffered significant damage. Almost all of the ports in the Azores archipelago suffered most of their destruction from the tsunami, with the sea penetrating about 150 metres (490ft) inland. Current and former Portuguese towns in northern Africa were also affected by the earthquake. Places such as Ceuta (ceded by Portugal to Spain in 1668) and Mazagon, where the tsunami hit hard the coastal fortifications of both towns, in some cases going over it, and flooding the harbor area, were affected. In Spain, the tsunamis swept the Andalusian Atlantic Coast, damaging the city of Cadiz.
2016 animation from NOAACalculated travel times (in hours) for the tsunami waves of 1 November 1755
Shocks from the earthquake were felt throughout Europe[11][12] as far as Finland and in North Africa, and according to some sources even in Greenland[13] and the Caribbean.[14] Tsunamis as tall as 20 metres (66ft) swept along the coast of North Africa, and struck Martinique and Barbados across the Atlantic Ocean. A three-metre (ten-foot)tsunami hit Cornwall on the southern British coast. Galway, on the west coast of Ireland, was also hit, resulting in partial destruction of the "Spanish Arch" section of the city wall. In County Clare, Aughinish Island was created when a low lying connection to the mainland was washed away. At Kinsale, several vessels were whirled round in the harbor, and water poured into the marketplace.[14]
In 2015, it was determined that the tsunami waves may have reached the coast of Brazil, then a colony of Portugal. Letters sent by Brazilian authorities at the time of the earthquake describe damage and destruction caused by gigantic waves.[15]
Although seismologists and geologists have always agreed that the epicenter was in the Atlantic to the west of the Iberian Peninsula, its exact location has been a subject of considerable debate. Early hypotheses had proposed the Gorringe Ridge, about 320km (170nmi; 200mi) south-west of Lisbon, until simulations showed that a location closer to the shore of Portugal was required to comply with the observed effects of the tsunami. A 1992 seismic reflection survey of the ocean floor along the Azores–Gibraltar Transform Fault detected a 50-kilometre-long (31mi)thrust fault southwest of Cape St. Vincent, with a dip-slip throw of more than 1km (0.62mi). This structure may have created the primary tectonic event.[1]
Casualties and damage
The ruins of the Carmo Convent, which was destroyed in the Lisbon earthquake.
Economic historian Álvaro Pereira estimated that of Lisbon's population at the time of approximately 200,000 people, 30,000–40,000 were killed. Another 10,000 may have died in Morocco. A 2009 study of contemporary reports relating to the 1 November event found them vague and difficult to separate from reports of another local series of earthquakes on 18–19 November.[16] Pereira estimated the total death toll in Portugal, Spain and Morocco from the earthquake and the resulting fires and tsunami at 40,000 to 50,000 people.[17]
Eighty-five percent of Lisbon's buildings were destroyed, including famous palaces and libraries, as well as most examples of Portugal's distinctive 16th-century Manueline architecture. Several buildings that had suffered little earthquake damage were destroyed by the subsequent fire. The new Lisbon opera house (the "Ópera do Tejo"), opened seven months before, burned to the ground. The Royal Ribeira Palace, which stood just beside the Tagus river in the modern square Praça do Comércio, was destroyed by the earthquake and tsunami. Inside, the 70,000-volume royal library as well as hundreds of works of art, including paintings by Titian, Rubens, and Correggio, were lost. The royal archives disappeared together with detailed historical records of explorations by Vasco da Gama and other early navigators. The palace of Henrique de Meneses, 3rd Marquis of Louriçal, which housed 18,000 books, was also destroyed.[18] The earthquake damaged several major churches in Lisbon, namely Lisbon Cathedral, St Paul's Cathedral, Santa Catarina, São Vicente de Fora, and the Church of Nossa Senhora da Conceição Velha. The Royal Hospital of All Saints (the largest public hospital at the time) in the Rossio square was consumed by fire and hundreds of patients burned to death. The tomb of national hero Nuno Álvares Pereira was also lost. Visitors to Lisbon may still walk the ruins of the Carmo Convent, which were preserved to remind Lisboners of the destruction. Most of the documentation of the 1722 Algarve earthquake sent to Lisbon for archiving became lost after the fire that followed the 1755 earthquake.
Executions in the aftermath of the Lisbon earthquake. At least 34 looters were hanged in the chaotic aftermath of the disaster. As a warning against looting, King Joseph I of Portugal ordered gallows to be constructed in several parts of the city.
The royal family escaped unharmed from the catastrophe: King Joseph I of Portugal and the court had left the city, after attending Mass at sunrise, fulfilling the wish of one of the king's daughters to spend the holiday away from Lisbon. After the catastrophe, Joseph I developed a fear of living within walls, and the court was accommodated in a huge complex of tents and pavilions in the hills of Ajuda, then on the outskirts of Lisbon. The king's claustrophobia never waned, and it was only after Joseph's death that his daughter Maria I of Portugal began building the royal Ajuda Palace, which still stands on the site of the old tented camp. Like the king, the prime minister Sebastião de Melo (1st Marquis of Pombal) survived the earthquake. When asked what was to be done, Pombal reportedly replied "bury the dead and heal the living",[20] and set about organizing relief and rehabilitation efforts. Firefighters were sent to extinguish the raging flames, and teams of workers and ordinary citizens were ordered to remove the thousands of corpses before disease could spread. Contrary to custom and against the wishes of the Church, many corpses were loaded onto barges and buried at sea beyond the mouth of the Tagus. To prevent disorder in the ruined city, the Portuguese Army was deployed and gallows were constructed at high points around the city to deter looters; more than thirty people were publicly executed.[21] The army prevented many able-bodied citizens from fleeing, pressing them into relief and reconstruction work.
The king and the prime minister immediately launched efforts to rebuild the city. On December 4, 1755, a little more than a month after the earthquake, Manuel da Maia, chief engineer to the realm, presented his plans for the re-building of Lisbon. Maia presented four options from abandoning Lisbon to building a completely new city. The first, and cheapest, plan was to rebuild the old city using recycled materials. The second and third plans proposed widening certain streets. The fourth option boldly proposed razing the entire Baixa quarter and "laying out new streets without restraint". This last option was chosen by the king and his minister.[22]
Model of the seismically protective wooden structure called "gaiola pombalina" (pombaline cage), developed for the reconstruction of Pombaline Lower Town
In less than a year, the city was cleared of debris. Keen to have a new and perfectly ordered city, the king commissioned the construction of big squares, rectilinear, large avenues and widened streets–the new mottos of Lisbon.
The Pombaline buildings are among the earliest seismically protected constructions in Europe. Small wooden models were built for testing, and earthquakes were simulated by marching troops around them. Lisbon's "new" Lower Town, known today as the Pombaline Lower Town (Baixa Pombalina), is one of the city's famed attractions. Sections of other Portuguese cities, such as the Vila Real de Santo António in Algarve, were also rebuilt along Pombaline principles.
The Casa Pia, a Portuguese institution founded by Maria I (known as A Pia, "Maria the Pious"), and organized by Police Intendant Pina Manique in 1780, was founded following the social disarray of the 1755 Lisbon earthquake.
Effect on society, economy, and philosophy
The earthquake had wide-ranging effects on the lives of the populace and intelligentsia. The earthquake had struck on an important religious holiday and had destroyed almost every important church in the city, causing anxiety and confusion amongst the citizens of a staunch and devout Roman Catholic country. Theologians and philosophers focused and speculated on the religious cause and message, seeing the earthquake as a manifestation of divine judgment.[23]
Economy
A 2009 study estimated that the earthquake cost between 32 and 48 per cent of Portugal's GDP.[24] Also, "in spite of strict controls, prices and wages remained volatile in the years after the tragedy. The recovery from the earthquake also led to a rise in the wage premium of construction workers. More significantly, the earthquake became an opportunity to reform the economy and to reduce the economic semi-dependency vis-à-vis Britain."[24]
Philosophy
Allegory of the 1755 Earthquake, by João Glama Strobërle (who depicted himself standing on a pile of rubble on the lower-right corner). In the upper-left corner is an angel holding a fiery sword, personifying divine judgement.
The earthquake and its aftermath strongly influenced the intelligentsia of the European Age of Enlightenment. The noted writer-philosopher Voltaire used the earthquake in Candide and in his Poème sur le désastre de Lisbonne ("Poem on the Lisbon disaster"). Voltaire's Candide attacks the notion that all is for the best in this, "the best of all possible worlds", a world closely supervised by a benevolent deity. The Lisbon disaster provided a counterexample for Voltaire. Theodor Adorno wrote, "[t]he earthquake of Lisbon sufficed to cure Voltaire of the theodicy of Leibniz" (Negative Dialectics 361). Jean-Jacques Rousseau was also influenced by the devastation following the earthquake, whose severity he believed was due to too many people living within the close quarters of the city. Rousseau used the earthquake as an argument against cities as part of his desire for a more naturalistic way of life.[25]
Immanuel Kant published three separate texts in 1756 on the Lisbon earthquake.[26] As a younger man, fascinated with the earthquake, he collected all the information available in news pamphlets and formulated a theory of the causes of earthquakes. Kant's theory, which involved shifts in huge caverns filled with hot gases, though inaccurate, was one of the first systematic attempts to explain earthquakes in natural rather than supernatural terms. According to Walter Benjamin, Kant's slim early book on the earthquake "probably represents the beginnings of scientific geography in Germany. And certainly the beginnings of seismology".
Werner Hamacher has claimed that the earthquake's consequences extended into the vocabulary of philosophy, making the common metaphor of firm "grounding" for philosophers' arguments shaky and uncertain: "Under the impression exerted by the Lisbon earthquake, which touched the European mind in one [of] its more sensitive epochs, the metaphor of ground and tremor completely lost their apparent innocence; they were no longer merely figures of speech" (263). Hamacher claims that the foundational certainty of René Descartes' philosophy began to shake following the Lisbon earthquake.[27]
The earthquake had a major impact on politics. The prime minister, Sebastião José de Carvalho e Melo, 1st Marquis of Pombal, was the favourite of the king, but the aristocracy despised him as an upstart son of a country squire. The prime minister, in turn, disliked the old nobles, whom he considered corrupt and incapable of practical action. Before 1 November 1755, there had been a constant struggle for power and royal favour, but the competent response of the Marquis of Pombal effectively severed the power of the old aristocratic factions. However, the silent opposition and resentment of King Joseph I began to rise, which would culminate with the attempted assassination of the king in 1758 and the subsequent elimination of the powerful Duke of Aveiro and the Távora family.[clarification needed]
In 1752, a Sebastianist predicted that a terrible earthquake would destroy Lisbon on All Saints' Day. After the 1755 Lisbon earthquake struck on All Saints' Day, there was a surge of converts to Sebastianism.[28]
The prime minister's response was not limited to the practicalities of reconstruction. He ordered a query sent to all parishes of the country regarding the earthquake and its effects. Questions included the following:
At what time did the earthquake begin, and how long did the earthquake last?
Did you perceive the shock to be greater from one direction than another? Example, from north to south? Did buildings seem to fall more to one side than the other?
How many people died and were any of them distinguished?
Did the sea rise or fall first, and how many hands did it rise above the normal?
If fire broke out, how long did it last and what damage did it cause?[29]
The answers to those and other questions are still archived in the Torre do Tombo, the national historical archive. Studying and cross-referencing the priests' accounts, modern scientists were able to reconstruct the event from a scientific perspective. Without the questionnaire designed by the Marquis of Pombal, that would have been impossible. Because Pombal was the first to attempt an objective scientific description of the broad causes and consequences of an earthquake, he is regarded as a forerunner of modern seismological scientists.[30]
A fictionalised version of the 1755 Lisbon earthquake features as a main plot element of the 2014 video gameAssassin's Creed Rogue, developed and published by Ubisoft.[32] Notably, a similar earthquake occurs earlier in the story in Port-au-Prince, Haiti, and possibly coincides with a real-world earthquake recorded there in 1751.[33]
The album 1755 by the Portuguese Gothic metal band Moonspell is a concept album detailing the story of the 1755 Lisbon earthquake. The album is entirely sung in Portuguese and explores not only the history but also its effects on Portuguese society, culture and spirituality.
The Lisbon earthquake is vividly depicted in Avram Davidson's Masters of the Maze, one of the many times and places visited by the book's time-traveling protagonists.
The board game Lisboa was created in 2017 by Vital Lacerda and focuses on the reconstruction of Lisbon after the earthquake.[34]
1 2 Zitellini N. et al., The tectonic source of the 1755 Lisbon earthquake and tsunami. Anali di Geofisica 1999; 42(1): 49. Online PDF. Archived 11 October 2007 at the Wayback Machine 27 May 2009.
↑ Robertson, John; Webb, Philip Carteret; Adee, Swithin; Hodgson, John; Cranbrook; Pringle, John; Mills, Henry; Birch, Thomas; Thomlinson, Mr; Philips, Richard; Crusius, Lewis; Blair, John; Parker, Viscount; Huxham, John; Borlase, William; Swanzey; Arderon, William; Barber, Thomas; Harrison, John; Cowper, Spencer; Gardener, Robert; Colquhoun, James; Nicola, L.; Brocklesby, Richard; HEN TOM; Steplin, Joseph; Hondt, De; Allamond, Mons (1755), "An Extraordinary and Surprising Agitation of the Waters, though without Any Perceptible Motion of the Earth, Having Been Observed in Various Parts of This Island, Both Maritime and Inland, on the Same Day, and Chiefly about the Time, That the More Violent Commotions of Both Earth and Waters so Extensively Affected Many Very Distant Parts of the Globe; the Following Accounts, Relating to the Former, Have Been Transmitted to the Society; in Which are Specified the Times and Places when and Where They Happened", Philosophical Transactions of the Royal Society of London, Series I, 49: 351–398, Bibcode:1755RSPT...49..351R, doi:10.1098/rstl.1755.0059, JSTOR104951
↑ Histoire de ma vie, Book 2, Ch. XXVI; Casanova himself noted feeling the shocks when he was imprisoned in "The Leads" in Venice and specifically states they were the same ones that destroyed Lisbon
↑ Dynes, Russell R. (2003). The Lisbon Earthquake in 1755: The First Modern Disaster.
↑ T. D. Kendrick. The Lisbon Earthquake. p.75. Kendrick writes that the remark is apocryphal and is attributed to other sources in anti-Pombal literature.
Amador, Filomena (2004) "The causes of 1755 Lisbon earthquake on Kant" In: Escribano Benito, J.J.; Español González, L.; Martínez García, M.A., ed.s. Actas VIII Congreso de la Sociedad Española de Historia de las Ciencias y de las Técnicas [Proceedings of the Eighth Congress of the Spanish Society of the History of the Sciences and Technology] (in English) Logroño, Spain: Sociedad Española de Historia de las Ciencias y de las Técnicas (Universidad de la Rioja), vol. 2, pp. 485–495.
↑ Hamacher, Werner (1996). Premises: Essays on Philosophy and Literature from Kant to Celan. Harvard University Press. p.263. ISBN9780674700734.
↑ National Geophysical Data Center / World Data Service (NGDC/WDS): NCEI/WDS Global Significant Earthquake Database. NOAA National Centers for Environmental Information (1972). "Significant Earthquake Information". NOAA National Centers for Environmental Information. doi:10.7289/V5TD9V7K.
Lisbon is the capital and largest city of Portugal, with an estimated population of 548,703 as of 2022 within its administrative limits in an area of 100.05 km2. Lisbon is mainland Europe's westernmost capital city and the only one along the Atlantic coast, the others being on islands. The city lies in the western portion of the Iberian Peninsula, on the northern shore of the River Tagus. The western portion of its metro area, the Portuguese Riviera, hosts the westernmost point of Continental Europe, culminating at Cabo da Roca.
Dom Joseph I, known as the Reformer, was King of Portugal from 31 July 1750 until his death in 1777. Among other activities, Joseph was devoted to hunting and the opera. His government was controlled by Sebastião José de Carvalho e Melo, 1st Marquis of Pombal.
Sebastião José de Carvalho e Melo, 1st Marquis of Pombal and 1st Count of Oeiras, known as the Marquis of Pombal, was a Portuguese despotic statesman and diplomat who effectively ruled the Portuguese Empire from 1750 to 1777 as chief minister to King Joseph I. A strong promoter of the absolute power and influenced by the Age of Enlightenment, Pombal led Portugal's recovery from the 1755 Lisbon earthquake and reformed the kingdom's administrative, economic, and ecclesiastical institutions. During his lengthy ministerial career, Pombal accumulated and exercised autocratic power. His cruel persecution of the Portuguese lower classes led him to be known as “Nero of Trafaria”, a village he ordered to be burned with all its inhabitants inside, after refusing to follow his orders.
Vila Real de Santo António is a city, civil parish, and municipality in the Algarve, Portugal. The population in 2011 was 19,156, in an area of 61.25 km2. It is one of the few municipalities in Portugal without territorial continuity: its territory comprises two parts, with the municipal seat located in the eastern part. Vila Real de Santo António was founded after the 1755 Lisbon earthquake, and largely expanded in 1774 using the same architectural and construction techniques employed in the reconstruction of Lisbon after the disaster.
The Baixa ("Downtown"), also known as the Baixa Pombalina, is a neighborhood in the historic center of Lisbon, Portugal. It consists of the grid of streets north of the Praça do Comércio, roughly between the Cais do Sodré and the Alfama district beneath the Lisbon Castle, and extends northwards towards the Rossio and Figueira squares and the Avenida da Liberdade, a tree-lined boulevard noted for its tailoring shops and cafes.
From the House of Braganza restoration in 1640 until the end of the reign of the Marquis of Pombal in 1777, the Kingdom of Portugal was in a transition period. Having been near its height at the start of the Iberian Union, the Portuguese Empire continued to enjoy the widespread influence in the world during this period that had characterized the period of the Discoveries. By the end of this period, however, the fortunes of Portugal and its empire had declined, culminating with the Távora affair, the catastrophic 1755 Lisbon earthquake, and the accession of Maria I, the first ruling Queen of Portugal.
Ribeira Palace was the main residence of the Kings of Portugal, in Lisbon, for around 250 years. Its construction was ordered by King Manuel I of Portugal when he found the Royal Alcáçova of São Jorge unsuitable. The palace complex underwent numerous reconstructions and reconfigurations from the original Manueline design, ending with its final Mannerist and Baroque form.
The Praça do Comércio is a large, harbour-facing plaza in Portugal's capital, Lisbon, and is one of the largest in Portugal, with an area of 175 by 175 m, that is, 30,600 m2.
The Convent of Our Lady of Mount Carmel is a former Catholic convent located in the civil parish of Santa Maria Maior, municipality of Lisbon, Portugal. The medieval convent was ruined during the sequence of the 1755 Lisbon earthquake, and the destroyed Gothic Church of Our Lady of Mount Carmel on the southern facade of the convent is the main trace of the great earthquake still visible in the old city.
Portuguese architecture refers to both the architecture of Portugal's modern-day territory in Continental Portugal, the Azores and Madeira, as well as the architectural heritage/patrimony of Portuguese architects and styles throughout the world, particularly in countries formerly part of the Portuguese Empire.
The Pombaline style was a Portuguese architectural style of the 18th century, named after Sebastião José de Carvalho e Melo, the first Marquês de Pombal, who was instrumental in reconstructing Lisbon after the earthquake of 1755. Pombal supervised the plans drawn up by the military engineers Manuel da Maia, Eugénio dos Santos and Elias Sebastião Pope. The new city was laid out on a grid plan with roads and pavements fixed at 40 ft wide (12 m). The previously standing Royal Palace was replaced with the Praça do Comércio which, along with square Rossio, defines the limits of the new city.
Gabriel Malagrida was an Italian Jesuit missionary in the Portuguese colony of Brazil and influential figure in the political life of the Lisbon Royal Court who described the devastating 1755 Lisbon earthquake as retribution prompted by God's wrath.
The 1531 Lisbon earthquake occurred in the Kingdom of Portugal on the morning of 26 January 1531, between 4 and 5 o'clock. The earthquake and subsequent tsunami resulted in approximately 30,000 deaths. Despite its severity, the disaster was not widely documented until the rediscovery of contemporary records in the early 20th century.
The Public Promenade was a park in Lisbon, Portugal, that was located where the Avenida da Liberdade is currently laid. Built after the 1755 Lisbon earthquake, the Passeio become an important fixture in the Lisbon landscape in the 19th century and was a meeting point for the upper echelons of Portuguese society.
The Castle of Almada is a medieval castle located in the civil parish of Almada, Cova da Piedade, Pragal e Cacilhas, in the municipality of Almada, Portuguese Setúbal.
Lisbon is one of the most popular city destinations in Europe. The city of Lisbon and the Lisbon metropolitan area attracts a significant number of tourists each year, drawn to its historical and cultural heritage, good transportation connections and good touristic infrastructure.
Hospital de São José is a public Central Hospital serving the Greater Lisbon area as part of the Central Lisbon University Hospital Centre (CHULC), a state-owned enterprise.
The Project for the Royal Palace in Campo de Ourique was an ambitious 18th century proposal for a monumental royal palace to be built in the Campo de Ourique neighborhood of Lisbon. Portuguese architect Dionizio de S. Dionizio planned the palace for King Joseph I of Portugal as part of the reconstruction efforts following the destruction of the 1755 Lisbon Earthquake.
The 1761 Lisbon earthquake and its subsequent tsunami occurred in the north Atlantic Ocean and south of the Iberian Peninsula. This violent shock which struck just after noon on 31 March 1761, was felt across many parts of Western Europe. Its direct effects were observed even far north in Scotland and Amsterdam, and to the south in the Canary Islands of Spain. The estimated surface-wave magnitude 8.5 event was the largest in the region, and the most significant earthquake in Europe since the Great Lisbon earthquake of 1755.
The 1722 Algarve earthquake occurred on 27 December 1722. It was felt throughout the Portuguese region of Algarve and destroyed a large area in southern Portugal generating a local tsunami that flooded the shallow areas of Tavira. It is unclear whether its source was located onshore or offshore and, in any case, what was the tectonic source responsible for the event. Some scientific research work has concluded that the 27 December 1722 Algarve earthquake and tsunami was probably generated offshore, close to 37°01′N, 7°49′W. The 1722 earthquake was 33 years before the great earthquake of 1755 which remains a major event in Portuguese history, mainly due to its effects on Lisbon which was wiped out by structural collapse, fire and then the flooding from a tsunami that raced up the Tagus River. Most of the documentation of the 1722 Algarve seismic event was sent to Lisbon for archiving and became lost after the fire that followed the 1755 earthquake. But the few surviving written records of the 1722 earthquake describe a destructive series of events affecting several Algarvean localities with earth tremors so strong that they made the bells ring out in Tavira, Faro and Loulé. In Tavira a caravel moored on the river Gilão was left high and dry before the tsunami hit with the dumbfounded crew able to walk to shore. The magnitude is estimated to have been 7.8 on the Richter scale. The earthquake of 1722 was probably caused by a diapirism where dense rock from deeper levels under high pressure pierced shallower materials. As a result, buildings in Albufeira, Faro, Lagoa and Loulé were also severely damaged or, in some cases, destroyed. In the 2010s, studies of seismic risk estimated there would be around 12,000 deaths if an earthquake equal to that of 1722 occurred then during peak season, because population density was significantly higher in the coastal areas of Algarve in the early 21st century, when it had already become a popular international travel destination, than in the 18th century, and construction of high-rise buildings built without proper anti-seismic measures were pervasive in the decades preceding such studies.
References
Benjamin, Walter. "The Lisbon Earthquake." In Selected Writings vol. 2. Belknap, 1999. ISBN0-674-94586-7. The often abstruse critic Benjamin gave a series of radio broadcasts for children in the early 1930s; this one, from 1931, discusses the Lisbon earthquake and summarizes some of its impact on European thought.
Braun, Theodore E. D., and John B. Radner, eds. The Lisbon Earthquake of 1755: Representations and Reactions (SVEC 2005:02). Oxford: Voltaire Foundation, 2005. ISBN0-7294-0857-4. Recent scholarly essays on the earthquake and its representations in art, with a focus on Voltaire. (In English and French.)
Brooks, Charles B. Disaster at Lisbon: The Great Earthquake of 1755. Long Beach: Shangton Longley Press, 1994. (No apparent ISBN.) A narrative history.
Chase, J. "The Great Earthquake at Lisbon (1755)". Colliers Magazine, 1920.
Dynes, Russell Rowe. "The dialogue between Voltaire and Rousseau on the Lisbon earthquake: The emergence of a social science view." University of Delaware, Disaster Research Center, 1999.
Fonseca, J. D. 1755, O Terramoto de Lisboa, The Lisbon Earthquake. Argumentum, Lisbon, 2004.
Hamacher, Werner. "The Quaking of Presentation." In Premises: Essays on Philosophy and Literature from Kant to Celan, pp.261–293. Stanford University Press, 1999. ISBN0-8047-3620-0.
Kendrick, T.D. The Lisbon Earthquake. Philadelphia and New York: J. B. Lippincott, 1957.
Molesky, Mark. This Gulf of Fire: The Destruction of Lisbon, or Apocalypse in the Age of Science and Reason. New York: Knopf, 2015.
Neiman, Susan. Evil in Modern Thought: An Alternative History of Modern Philosophy. Princeton University Press, 2002. This book centers on philosophical reaction to the earthquake, arguing that the earthquake was responsible for modern conceptions of evil.
Paice, Edward. Wrath of God: The Great Lisbon Earthquake of 1755. London: Quercus, 2008. ISBN978-1-84724-623-3
Seco e Pinto, P.S. (Editor). Earthquake Geotechnical Engineering: Proceedings of the Second International Conference, Lisbon, Portugal, 21–25 June 1999. ISBN90-5809-116-3
Shrady, Nicholas. The Last Day: Wrath, Ruin & Reason in The Great Lisbon Earthquake of 1755, Penguin, 2008, ISBN978-0-14-311460-4
Weinrich, Harald. "Literaturgeschichte eines Weltereignisses: Das Erdbeben von Lissabon." In Literatur für Leser, pp.64–76. Stuttgart: Kohlhammer Verlag, 1971. ISBN3-17-087225-7. In German. Cited by Hamacher as a broad survey of philosophical and literary reactions to the Lisbon earthquake.
Martínez-Loriente, S., Sallarès, V. & Gràcia, E. The Horseshoe Abyssal plain Thrust could be the source of the 1755 Lisbon earthquake and tsunami. Commun Earth Environ 2, 145 (2021). https://doi.org/10.1038/s43247-021-00216-5
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