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Puerto Rico, officially the Commonwealth of Puerto Rico, is an archipelagic island U.S. territory comprised of the eponymous main island of Puerto Rico and 142 smaller islands, including Vieques, Culebra, and Mona. It is located between the Greater and Lesser Antilles in the northeastern Caribbean Sea, east of Hispaniola, west of Saint Thomas, north of Venezuela, and south of the Puerto Rico Trench. Measuring 177 km in length and 65 km in width with a land area of 8,868 sq km, the main island is the 3rd largest in the U.S., 4th in the Caribbean, 29th in the Americas, and 81st in the world, making it the 174th largest country or dependency by surface area. With 3.2 million residents, it is the 2nd largest in the U.S., 4th in the Caribbean, 4th in the Americas, and 31st in the world, making it the 136th largest country or dependency by population.
The 1960 Valdivia earthquake and tsunami or the Great Chilean earthquake occurred on 22 May 1960. Most studies have placed it at 9.4–9.6 on the moment magnitude scale, while some studies have placed the magnitude lower than 9.4. This makes it the most powerful earthquake ever recorded. It occurred in the afternoon, and lasted 10 minutes. The resulting tsunamis affected southern Chile, Hawaii, Japan, the Philippines, eastern New Zealand, southeast Australia, and the Aleutian Islands.
Castillo San Felipe del Morro, most commonly known as El Morro(The Promontory), is a large fortress and citadel in the historic district of Old San Juan in Puerto Rico. Commissioned by King Charles I of Spain in 1539, it was first built as a fortified tower in honor of King Philip II, who oversaw its expansion into a hornwork fort by 1595. Over the next 200 years, especially in the reign of King Charles III, El Morro continued to be developed to reach its current form in 1787. Rising 140 ft from the Atlantic shoreline with 18 to 25 ft thick walls, the six-leveled edifice stands on a steep, rocky headland promontory on San Juan Islet guarding the entry to San Juan Bay, the harbor of Old San Juan. El Morro, alongside La Fortaleza, San Cristóbal, El Cañuelo, and other forts part of the Walls of Old San Juan, protected strategically and militarily important Puerto Rico, or La Llave de las Indias, from invasion by competing world powers during the Age of Sail. It was designated a World Heritage Site by UNESCO in 1983.
Castillo San Cristóbal is a fortress in the historic district of Old San Juan, Puerto Rico, known as the largest fortification built by the Spanish in the New World. Dating back to defense expansions following attacks by the English in 1598 and the Dutch in 1625, it was first built in 1634 as the Garita del Diablo and an artillery platform. Over the next 150 years, especially in the reign of King Charles III of Spain, it continued to be developed into a bastion fort to reach its largest size in 1790. Rising 150 ft from the Atlantic shoreline, the three-level edifice stands on a hill at the northern coastline of San Juan Islet, guarding the land entry to Old San Juan. San Cristóbal, alongside El Morro, La Fortaleza, and other forts part of the Walls of Old San Juan, protected strategically and militarily important Puerto Rico, or La Llave de las Indias , from invasion by competing world powers during the Age of Sail. It was designated a World Heritage Site by UNESCO in 1983.
Old San Juan is a historic district located at the "northwest triangle" of the islet of San Juan in San Juan. Its area roughly correlates to the Ballajá, Catedral, Marina, Mercado, San Cristóbal, and San Francisco sub-barrios (sub-districts) of barrio San Juan Antiguo in the municipality of San Juan, Puerto Rico.
The Pacific Tsunami Warning Center (PTWC), located on Ford Island, Hawaii, is one of two tsunami warning centers in the United States, covering Hawaii, Guam, American Samoa and the Northern Mariana Islands in the Pacific, as well as Puerto Rico, the U.S. Virgin Islands and the British Virgin Islands in the Caribbean Sea. Other parts of the United States are covered by the National Tsunami Warning Center.
San Juan National Historic Site in the Old San Juan section of San Juan, Puerto Rico, is a National Park Service-managed historic site which preserves and interprets the Spanish colonial-era fortification system of the city of San Juan, and features structures such as the San Felipe del Morro and San Cristóbal fortresses. This fortification system is the oldest European construction under United States jurisdiction and one of the oldest in the New World. This national historic site, together with La Fortaleza, have been designated a UNESCO World Heritage Site since 1983.
The Geology of Puerto Rico can be divided into three major geologic provinces: The Cordillera Central, the Carbonate, and the Coastal Lowlands. Puerto Rico is composed of Jurassic to Eocene volcanic and plutonic rocks, which are overlain by younger Oligocene to recent carbonates and other sedimentary rocks. Most of the caverns and karst topography on the island occurs in the northern Oligocene to recent carbonates. The oldest rocks are approximately 190 million years old (Jurassic) and are located at Sierra Bermeja in the southwest part of the island. These rocks may represent part of the oceanic crust and are believed to come from the Pacific Ocean realm.
The 1918 San Fermín earthquake, also known as the Puerto Rico earthquake of 1918, struck the island of Puerto Rico at 10:14:42 local time on October 11. The earthquake measured 7.1 on the moment magnitude scale and IX (Violent) on the Mercalli intensity scale. The mainshock epicenter occurred off the northwestern coast of the island, somewhere along the Puerto Rico Trench.
The 2012 Costa Rica earthquake occurred at 08:42 local time on September 5. The epicenter of the 7.6 Mw earthquake was in the Nicoya Peninsula, 11 kilometers east-southeast of Nicoya. A tsunami warning was issued shortly afterwards, but later cancelled. Two people are known to have died, one from a heart attack and another, a construction worker, crushed by a collapsing wall. It was the second strongest earthquake recorded in Costa Rica's history, following the 1991 Limon earthquake.
San Juan Bay is the bay and main inlet adjacent to Old San Juan in northeastern Puerto Rico. It is about 3.5 miles (5.6 km) in length, the largest body of water in an estuary of about 97 square miles (250 km2) of channels, inlets and eight interconnected lagoons. The San Juan Bay is home to the island's busiest harbor and its history dates back to at least 1508.
Starting on December 28, 2019, and progressing into 2020, the southwestern part of the island of Puerto Rico was struck by an earthquake swarm, including 11 that were of magnitude 5 or greater. The largest and most damaging of this sequence was a magnitude 6.4 Mw, which occurred on January 7 at 04:24 AST (08:24 UTC), with a maximum felt intensity of VIII (Severe) on the Modified Mercalli intensity scale. At least one person was killed, and several others were injured.
The 1867 Virgin Islands earthquake and tsunami occurred on November 18, at 14.45 in the Anegada Passage about 20 km southwest of Saint Thomas, Danish West Indies. The Ms 7.5 earthquake came just 20 days after the devastating San Narciso Hurricane in the same region. Tsunamis from this earthquake were some of the highest ever recorded in the Lesser Antilles. Wave heights exceeded 10 m (33 ft) in some islands in the Lesser Antilles. The earthquake and tsunami resulted in no more than 50 fatalities, although hundreds of casualties were reported.
The 1900 Venezuelan earthquake also known as the San Narciso earthquake, occurred on October 28 at between 4:30 and 4:45 am local time. This earthquake had an epicenter off Miranda State or near the Venezuelan capital Caracas, in the Cariaco Basin. It had an estimated moment magnitude of 7.6–7.7 and a surface-wave magnitude of 7.7–8.4. It had a maximum Mercalli intensity assigned VIII–X, causing landslides and liquefaction events. Many buildings were severely damaged or collapsed during the earthquake. It is thought to be the last great earthquake of the 19th century and the largest instrumentally recorded in the republic, having been felt throughout.
The 1929 Cumaná earthquake occurred on January 17 at 07:45:44 local time, affecting Venezuela. Measuring 6.7 on the moment magnitude scale (Mw ) at a depth of 10 km (6.2 mi), the earthquake severely damaged the city of Cumaná in Sucre state. The earthquake had an epicenter located offshore in the Caribbean Sea, and had a maximum Modified Mercalli intensity scale rating of IX (Violent). It lasted 30 seconds, causing major damage and a tsunami. Although the total death toll is unknown, it may be as high as 1,600.
The 2010 Aguas Buenas earthquake, also referred to as the 2010 Christmas Eve earthquake, occurred on December 24 at 7:43 p.m. local time in Aguas Buenas, Puerto Rico. It measured 5.1 on the moment magnitude scale and had a maximum Mercalli intensity of VI (Strong). The event was the largest in Puerto Rico since May 16th of the same year, and the largest to impact the San Juan metropolitan area since 1975. The earthquake was felt throughout the island of Puerto Rico, the island municipalities of Vieques and Culebra, the American and British Virgin Islands, and even in the Dominican Republic across the Mona Passage.
The 2010 Moca earthquake, also referred to as the 2010 Puerto Rico earthquake, occurred on May 16 at 1:16 a.m. local time in Moca, Puerto Rico. The earthquake measured 5.8 on the moment magnitude scale and had a maximum Mercalli intensity of VI (Strong). This was the largest earthquake to strike Puerto Rico since the 1943 Puerto Rico earthquake which measured 7.7 on the Richter scale. This was also the first moderate to major earthquake in recorded history to originate on land in Puerto Rico, as earthquakes in the region usually have their epicenter in the ocean; another earthquake with an epicenter on land would occur later in December of the same year.
The Walls of Old San Juan is a defensive city wall that surrounds the western end of the San Juan Islet, site of the historic district of San Juan, Puerto Rico. This defensive wall system was built between the 16th and 18th centuries to protect the city and the Bay of San Juan, a highly strategic point in the Caribbean. These walls, along with the defensive fortresses in Old San Juan, form part of the UNESCO World Heritage Site-designated San Juan National Historic Site as they are characteristic examples of the historic methods of construction used in military architecture which adapted European designs and techniques to the special conditions of the Caribbean port cities.
The 1882 Panama earthquake occurred on September 7 at around 03:50 (UTC-5). The earthquake measured a magnitude between 7.9 and 8.3 on the surface-wave magnitude scale, making it the largest earthquake recorded in Panamanian history. It struck the San Blas Islands and was strongly felt in the City of Colón as well as the capital of Panama City. The earthquake also produced a major tsunami that had a maximum run-up of 3 meters. In total, the earthquake killed 250 people, 75 of which were from the tsunami. The earthquake and tsunami also halted the construction of the Panama Canal by a few months.
References
- 1 2 3 4 ten Brink, Dr. Uri; Bakun, William H.; Flores, Claudia H. (29 December 2011). "Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region". Journal of Geophysical Research. 116 (B12). Bibcode:2011JGRB..11612318T. doi:10.1029/2011JB008497. hdl: 1912/5022 .
- 1 2 Earthquake History of Puerto Rico and the Virgin Islands on USGS
- ↑ Alvarado León, Gerardo E. (May 5, 2016). "A 229 años del terremoto "más fuerte en la historia"". El Nuevo Día . Retrieved May 5, 2016.
- ↑ Arecibo on EdicionesDigitales
- ↑ El Morro, San Cristobal y San Geronimo en peligro en caso de terremoto Archived 2014-01-08 at the Wayback Machine on NoticiasOnline (6/7/2009)
- ↑ Historia sísmica de Puerto Rico: Terremotos significativos en la zona de Puerto Rico. SalonHogar.com Accessed 22 March 2018.