Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...

and the

Virgin Islands The Virgin Islands ( es, Islas Vírgenes) are an archipelago in the Caribbean Sea. They are geologically and biogeographically the easternmost part of the Greater Antilles, the northern islands belonging to the Puerto Rico Trench and St. Croix ...

lie at the boundary between the

Caribbean The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Se ...

and

North American North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Ca ...

plates, making these territories prone to

earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

s. This is a highly active seismic region both surrounded and traversed by numerous fault lines; to the north, the North American plate

subducts Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...

into the Caribbean plate, while a number of

transform fault A transform fault or transform boundary, is a fault along a plate boundary where the motion is predominantly horizontal. It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subductio ...

lines cross the main island of Puerto Rico diagonally from southeast to northeast. Puerto Rico and the Virgin Islands are also located on a microplate that is continuously being trampled by the subduction zone to the north. Puerto Rico is constantly prone to experiencing major earthquakes, superior to 7.0, at any moment.

History

The region has been seismically active since ancient times. The Great Northern and Great Southern fault zones that cross the main island of Puerto Rico laterally have been active since the

Eocene The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...

epoch. Earthquakes in the region have been recorded since the early 17th century and some of the first seismic activity in the

Americas The Americas, which are sometimes collectively called America, are a landmass comprising the totality of North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World. Along with th ...

were recorded first in

and

Hispaniola Hispaniola (, also ; es, La Española; Latin and french: Hispaniola; ht, Ispayola; tnq, Ayiti or Quisqueya) is an island in the Caribbean that is part of the Greater Antilles. Hispaniola is the most populous island in the West Indies, and th ...

. One of the first recorded earthquakes in the region was on September 8, 1615, which originated in the

Dominican Republic The Dominican Republic ( ; es, República Dominicana, ) is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean region. It occupies the eastern five-eighths of the island, which it shares wit ...

region and caused damages throughout the island. Earthquakes have been studied and recorded in Puerto Rico since the 20th century. The Puerto Rico Seismic Network (''Red Sísmica de Puerto Rico'' or RSPR), which is contained within the department of Geology of the University of Puerto Rico, Mayagüez, was established in 1974 by the

United States Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, ...

(USGS) and the former

Puerto Rico Electric Power Authority The Puerto Rico Electric Power Authority (PREPA; Spanish: ''LUMA'', ''AEE'') was an electric power company owned by the Commonwealth of Puerto Rico responsible for electricity generation, power distribution, and power transmission on the island. ...

(PREPA). It was established with the goal evaluating seismic features for the purpose of building

nuclear power Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced b ...

plants in the region. Its mission today is to detect, process and study seismic activity within the Puerto Rico region. The RSPR operates 25 seismometers throughout Puerto Rico, the US Virgin Islands and the British Virgin Islands. Two of these seismometers are owned by the

United States Army Corps of Engineers , colors = , anniversaries = 16 June (Organization Day) , battles = , battles_label = Wars , website = , commander1 = ...

. On average, there are about 5 earthquakes recorded per day and about 3 earthquakes with magnitude 5.0 higher recorded per year in the region. Given that most of the active faults are located at sea, most earthquakes in the region do not cause loss of life or significant damage, and significant destructive earthquakes that occur in Puerto Rico are rare. Most large earthquakes have historically occurred at sea which makes the area susceptible to destructive

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 ...

s. The last tsunami to cause significant damages in Puerto Rico was on October 11, 1918 which was generated by the 1918 Aguadilla earthquake. There have been more recent tsunami events, such as in

1946 Events January * January 6 - The 1946 North Vietnamese parliamentary election, first general election ever in Vietnam is held. * January 7 – The Allies recognize the Austrian republic with its 1937 borders, and divide the country into f ...

, which did not cause significant damage to the island. The last earthquakes to cause loss of life were the 2020 southwestern Puerto Rico sequence of earthquakes which caused 4 deaths. The last earthquake to cause significant damage and loss of life in the Virgin Islands occurred in

1867 Events January–March * January 1 – The Covington–Cincinnati Suspension Bridge opens between Cincinnati, Ohio, and Covington, Kentucky, in the United States, becoming the longest single-span bridge in the world. It was renamed a ...

; this earthquake generated a tsunami that affected the Virgin Islands and Puerto Rico.

Notable earthquakes in Puerto Rico and the Virgin Islands

References

{{Reflist

External links

Puerto Rico Seismic Network

Red Sísmica de Puerto Rico
– RSPR
Puerto Rico Earthquakes
- USGS Earthquakes in Puerto Rico

Earthquakes An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

Natural disasters in Puerto Rico Lists of earthquakes *

earthquakes, Puerto Rico

History

Notable earthquakes in Puerto Rico and the Virgin Islands

See also

References

External links