The 1692 Jamaica earthquake struck
Port Royal
Port Royal is a village located at the end of the Palisadoes, at the mouth of Kingston Harbour, in southeastern Jamaica. Founded in 1494 by the Spanish, it was once the largest city in the Caribbean, functioning as the centre of shipping and co ...
,
Jamaica
Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of His ...
, on 7 June. A stopped pocket watch found in the harbor during a 1959 excavation
[Sunken Pirate City at Port Royal](_blank)
/ref> indicated that it occurred around 11:43 AM local time.
Known as the "storehouse and treasury of the West Indies
The West Indies is a subregion of North America, surrounded by the North Atlantic Ocean and the Caribbean Sea that includes 13 independent island countries and 18 dependencies and other territories in three major archipelagos: the Greater A ...
" and as "one of the wickedest places on Earth", Port Royal was, at the time, the unofficial capital of Jamaica and one of the busiest and wealthiest ports in the Americas, as well as a common home port for many of the privateer
A privateer is a private person or ship that engages in maritime warfare under a commission of war. Since robbery under arms was a common aspect of seaborne trade, until the early 19th century all merchant ships carried arms. A sovereign or deleg ...
s and pirate
Piracy is an act of robbery or criminal violence by ship or boat-borne attackers upon another ship or a coastal area, typically with the goal of stealing cargo and other valuable goods. Those who conduct acts of piracy are called pirates, v ...
s operating on the Caribbean Sea
The Caribbean Sea ( es, Mar Caribe; french: Mer des Caraïbes; ht, Lanmè Karayib; jam, Kiaribiyan Sii; nl, Caraïbische Zee; pap, Laman Karibe) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico ...
.
The 1692 earthquake caused most of the city to sink below sea level. About 2,000 people died as a result of the earthquake and the following tsunami
A tsunami ( ; from ja, 津波, lit=harbour wave, ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explo ...
, and another 3,000 people died in the following days due to injuries and disease.
Tectonic setting
The island of Jamaica lies on the boundary between the Caribbean Plate
The Caribbean Plate is a mostly oceanic tectonic plate underlying Central America and the Caribbean Sea off the north coast of South America.
Roughly 3.2 million square kilometers (1.2 million square miles) in area, the Caribbean Plate borders ...
and the Gonâve Microplate Gonave may refer to:
*Gulf of Gonâve
*Gonâve Island
* Gonâve Microplate See also
*Gonaïves
Gonaïves (; ht, Gonayiv, ) is a List of communes of Haiti, commune in northern Haiti, and the capital of the Artibonite (department), Artibonite Depa ...
. The Gonâve microplate is a long strip of mainly oceanic crust
Oceanic crust is the uppermost layer of the oceanic portion of the tectonic plates. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumu ...
formed by the Cayman spreading ridge
A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of about and rises about above the deepest portion of an ocean basin. This feature is where seafloor spreading takes place along a diverge ...
within a strike-slip
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 ...
pull-apart basin on the northern transform
Transform may refer to:
Arts and entertainment
* Transform (scratch), a type of scratch used by turntablists
* ''Transform'' (Alva Noto album), 2001
* ''Transform'' (Howard Jones album) or the title song, 2019
* ''Transform'' (Powerman 5000 album ...
margin of the Caribbean Plate with the North American Plate
The North American Plate is a tectonic plate covering most of North America, Cuba, the Bahamas, extreme northeastern Asia, and parts of Iceland and the Azores. With an area of , it is the Earth's second largest tectonic plate, behind the Pacific ...
. Jamaica was formed by uplift associated with a restraining bend along this strike-slip structure. The focal mechanism
The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is ...
s of earthquakes around Jamaica are primarily sinistral strike-slip along WSW-ENE trending faults and minor reverse or thrust motion on NW-SE trending faults. The 1692 event is thought to have occurred on one of these 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 ...
s.
Damage
Two-thirds of the town, about 13 ha (33 acres), sank into the sea immediately after the main shock. According to Robert Renny in his ''An History of Jamaica'' (1807): "All the wharves sunk at once, and in the space of two minutes, nine-tenths of the city were covered with water, which was raised to such a height, that it entered the uppermost rooms of the few houses which were left standing. The tops of the highest houses were visible in the water and surrounded by the masts of vessels, which had been sunk along with them."
Before the earthquake the town consisted of 6,500 inhabitants living in about 2,000 buildings, many constructed of brick and with more than one storey, and all built on loose sand. During the shaking, the sand liquefied and the buildings, along with their occupants, appeared to flow into the sea. More than twenty ships moored in the harbour were capsized. One ship, the frigate
A frigate () is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied somewhat.
The name frigate in the 17th to early 18th centuries was given to any full-rigged ship built for speed and ...
, was carried over the rooftops by the tsunami.
During the main shock, the sand was said to have formed waves. Fissures repeatedly opened and closed, crushing many people. After the shaking stopped the sand again solidified, trapping many victims. Palisadoes cemetery, where the grave of the former pirate Sir Henry Morgan
Sir Henry Morgan ( cy, Harri Morgan; – 25 August 1688) was a privateer, plantation owner, and, later, Lieutenant Governor of Jamaica. From his base in Port Royal, Jamaica, he raided settlements and shipping on the Spanish Main, becoming wea ...
was located, was one of the parts of the city to fall into the sea; his body has never been found.
At Liguanea (present-day Kingston), all the houses were destroyed and water was ejected from 12 m (40 foot) deep wells. Almost all the houses at St. Jago (Spanish Town
Spanish Town ( jam, label=Jamaican Creole, Panish Tong) is the capital and the largest town in the parish of St. Catherine in the historic county of Middlesex, Jamaica. It was the Spanish and British capital of Jamaica from 1534 until 1872. Th ...
) were destroyed.
Many landslide
Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated grade (slope), slope failures, mudflows, and debris flows. Landslides occur in a variety of ...
s occurred across the island. The largest, the Judgement Cliff landslide, displaced the land surface by up to 800 m and killed 19 people. Several rivers were temporarily dammed and a few days after the earthquakes the harbour became flooded with large numbers of trees stripped of their bark brought down after one of these dams was breached.
A pocket watch, made in the Netherlands by the French maker Blondel in about 1686, was recovered during underwater archaeological
Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landscap ...
investigations led by Edwin Link
Edwin Albert Link (July 26, 1904 – September 7, 1981) was an American inventor, entrepreneur and pioneer in aviation, underwater archaeology, and submersibles. He invented the flight simulator, which was called the "Blue Box" or "Link Trai ...
in 1959. The watch was stopped with its hands pointing to 11:43 AM; this matches well with contemporary accounts of the timing of the earthquake.
Aftermath
Even before the destruction was complete, some of the survivors began looting, breaking into homes and warehouses. The dead were also robbed and stripped, and, in some cases, had fingers cut off to remove the rings that they wore.
In the immediate aftermath of the earthquake, it was common to ascribe the destruction to divine retribution
Divine retribution is supernatural punishment of a person, a group of people, or everyone by a deity in response to some action. Many cultures have a story about how a deity exacted punishment upon previous inhabitants of their land, causing th ...
on the people of Port Royal for their sinful ways. Members of the Jamaica Council declared: "We are become by this an instance of God Almighty's severe judgement." This view of the disaster was not confined to Jamaica; in Boston
Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...
, the Reverend Cotton Mather
Cotton Mather (; February 12, 1663 – February 13, 1728) was a New England Puritan clergyman and a prolific writer. Educated at Harvard College, in 1685 he joined his father Increase as minister of the Congregationalist Old North Meeting H ...
said in a letter to his uncle: "Behold, an accident speaking to all our English America".
After the earthquake, the town was partially rebuilt. But the colonial government was relocated to Spanish Town
Spanish Town ( jam, label=Jamaican Creole, Panish Tong) is the capital and the largest town in the parish of St. Catherine in the historic county of Middlesex, Jamaica. It was the Spanish and British capital of Jamaica from 1534 until 1872. Th ...
, which had been the capital under Spanish rule. Port Royal was devastated by a fire in 1703 and a hurricane
A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depend ...
in 1722. Most of the sea trade moved to Kingston. By the late 18th century, Port Royal was largely abandoned.
Characteristics
Earthquake
There were three separate shocks, each with increasing intensity, culminating in the mainshock. The estimated size of the event was 7.5 on the moment magnitude scale
The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 pape ...
.
Despite reports of the town flowing into the sea, the main result of the earthquake was subsidence caused by liquefaction. This would also explain an eyewitness account of houses being swallowed and people being buried up to their necks in the sand. The probable triggering of the Judgement Cliff landslide during the earthquake occurred along the line of the Plantain Garden fault. Movement on this structure has been suggested as the cause of the earthquake.
Landslides
The Judgement Cliff landslide is a complex rock-slide slump with a volume of about 131–181 × 106 m3. The slip surface is found within zones of clay and shale with gypsum at the base of a limestone unit. This landslide occurred after the earthquake but it remains possible that heavy rain over the few days after the event, or possibly during a hurricane in October later that year was the final trigger for the slip.
Tsunami
The sea was observed to retreat by about at Liguanea (probably near Kingston) while at Yallahs it withdrew . It returned as a high wave that swept over the land. One possible cause of the tsunami is thought to be the slump and grain flow into the harbour from beneath the town itself, although the waves in the harbour may be better described as seiche
A seiche ( ) is a standing wave in an enclosed or partially enclosed body of water. Seiches and seiche-related phenomena have been observed on lakes, reservoirs, swimming pools, bays, harbors, caves and seas. The key requirement for formation o ...
s and larger waves reported elsewhere, such as at Saint Ann's Bay
Saint Ann's Bay is a settlement in Jamaica, the capital of Saint Ann Parish. It had a population of 10,961 at the 1991 census.
Musicians Floyd Lloyd and Burning Spear, and Marcus Garvey were born in the town.
History
When Christopher Columbus ...
, are explained as the result of an entirely separate submarine landslide, also triggered by the earthquake.
Future seismic hazard
Estimates of current deformation of Jamaica suggest that sufficient strain has accumulated to generate a M=7.0–7.3 earthquake, similar in size to the 1692 event. This may mean that a repeat of this event is imminent, although this estimate relies on many assumptions, such as that none of the motion on the Plantain Garden fault is accommodated by aseismic creep
In geology, aseismic creep or fault creep is measurable surface displacement along a fault in the absence of notable earthquakes. Aseismic creep may also occur as "after-slip" days to years after an earthquake. Notable examples of aseismic slip in ...
.
See also
* List of historical earthquakes
Historical earthquakes is a list of significant earthquakes known to have occurred prior to the beginning of the 20th century. As the events listed here occurred before routine Seismometer, instrumental recordings, they rely mainly on the analys ...
* List of earthquakes in the Caribbean
Major earthquakes in the Caribbean are infrequent and are sometimes accompanied by tsunami.
Earthquakes
See also
* List of earthquakes in Cuba
* List of earthquakes in the Dominican Republic
* List of earthquakes in Haiti
* List of earthquake ...
References
Further reading
*
{{DEFAULTSORT:1692 Jamaica Earthquake
Earthquakes in Jamaica
Jamaica Earthquake, 1692
Jamaica Earthquake, 1692
17th century in Jamaica
Port Royal