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Topic: Puerto Rico Trench

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	Puerto Rico Trench - Wikipedia, the free encyclopedia
		The trench is associated with a complex transition between the subduction zone to the south along the Lesser Antilles island arc and the major transform fault zone or plate boundary that extends west between Cuba and Hispaniola through the Cayman Trench to the coast of Central America.
		Puerto Rico, the United States Virgin Islands, British Virgin Islands and the Dominican Republic do not have active volcanoes, however they are at risk from earthquakes and tsunamis.
		Puerto Rico in particular has always been an area of concern to earthquake experts because, apart from the 1918 episode, there are frequent cases of tremors in and around the island.
	en.wikipedia.org /wiki/Puerto_Rico_Trench (657 words)

	MSN Encarta - Puerto Rico
		Puerto Rico, freely associated commonwealth of the United States, composed of one large, densely populated island and several small islands in the West Indies.
		Puerto Rico is the easternmost island of the Greater Antilles.
		Mona Passage separates Puerto Rico from the Dominican Republic (on the island of Hispaniola) to the west; the Vieques Passage separates it from its island of Vieques to the east.
	encarta.msn.com /encyclopedia_761562626/Puerto_Rico.html (1165 words)

	NOAA Ocean Explorer: Puerto Rico trench
		The Puerto Rico Trench: Implications for Plate Tectonics and Earthquake and Tsunami Hazards
		The Puerto Rico Trench is the deepest part of the Atlantic Ocean, with water depths exceeding 8,400 meters (figure 1).
		Puerto Rico, the Virgin Islands to its east, and eastern Hispaniola to its west, are located on an active plate boundary zone between the North American plate and the northeast corner of the Caribbean plate (figure 1).
	oceanexplorer.noaa.gov /explorations/03trench/trench/trench.html (769 words)

	Sedimentary Processes
		Puerto Rico and the Virgin Islands lie within the North American-Caribbean plate boundary zone which extends from the Puerto Rico Trench in the north to the Muertos Trough in the south (Fig.1) (e.g., Burke et al., 1984; Dillon, Edgar, Scanlon, and Coleman, this volume).
		Variations in the width of the trench floor may be related to the intersection of the trench with the slightly oblique structures of the basin and ridge province.
		Shelf sediments are found in turbidites on the floor of the Puerto Rico Trench (Doull, 1983), 150 km from the shelf and north of the basin and ridge province.
	pubs.usgs.gov /of/of00-006/htm/sedproc.htm (6708 words)

	Puerto Rico english version
		The Commonwealth of Puerto Rico (in Spanish, "Estado Libre Asociado de Puerto Rico"), is a freely associated commonwealth of the United States, composed of one large island and several small islands named Culebra, Desecheo, Mona, and Vieques.
		Puerto Rico is bound at the north by the Atlantic Ocean and at the south by the Caribbean Sea.
		Puerto Rico is a mountainous, tropical island roughly rectangular in shape.
	www.proyectosalonhogar.com /Puerto_Rico/PRENGLISH.htm (5738 words)

	Neotectonic Setting of Puerto Rico
		Puerto Rico Trench and the basin and ridge province
		The age of possible rotation of Puerto Rico is constrained only to a small anticlockwise movement since the Cretaceous (Fink and Harrison, 1972), but igneous rocks possibly as young as Pleistocene in age have apparently been rotated on the adjacent island of Hispaniola (Mann and Burke, 1984, their Table 9).
		McCann, W.R. On the earthquake hazards of Puerto Rico and the Virgin Islands.
	pubs.usgs.gov /of/of00-006/htm/neoset.htm (6646 words)

	Puerto Rico Geography (Site not responding. Last check: 2007-10-21)
		To the north and south seas capes measure 8.525 m for the Grave of Puerto Rico and 5.000 m for the Grave of Tanner.
		Off the northern coast is the 28,000 feet (8,500 meters) deep Puerto Rico Trench, and to the south the sea bottom descends to the 16,400 feet (5,000 meters) deep Venezuelan Basin of the Caribbean.
		Puerto Rico is expose to the cyclones of Caribbean, although less than Jamaica, Cuba, and the Lesser Antilles.
	welcome.topuertorico.org /geogra.shtml (1846 words)

	Puerto Rico Description (Site not responding. Last check: 2007-10-21)
		To the west by Haití and the Dominican Republic (La Hispañola), separated by the Mona Passage ("Mona Canal"), to the east by the Virgin Islands, to the north by the Atlantic Ocean, and to the south by the Caribbean Sea.
		Puerto Rico is close to the deepest submarine depression in the North Atlantic Ocean.
		The Puerto Rico Trench appears to be part of a complex system of sinistral strike-slip faults in the north Caribbean; the trench seems to have been opened continuously for about 70 million years.
	welcome.topuertorico.org /descrip.shtml (1181 words)

	The 1918 Tsunami in Puerto Rico
		The island of Puerto Rico is located along the northern boundary of the Caribbean plate, the expression of which is manifested as the Puerto Rico Trench, located immediately north of the island.
		At the Puerto Rico Trench (the deepest location in the Atlantic Ocean), the North American Plate is being obliquely subducted beneath the Caribbean Plate to the south.
		On October 11, 1918, the island of Puerto Rico was struck by a magnitude 7.5 earthquake, centered approximately 15 kilometers off island's northwestern coast, in the Mona Passage.
	www.usc.edu /dept/tsunamis/caribbean/webpages/1918prindex.html (752 words)

	Puerto Rico Trench -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		The island of (A self-governing commonwealth associated with the United States occupying the island of Puerto Rico) Puerto Rico lays immediately to the south of the fault zone and the trench.
		Volcanic activity is frequent along the island arc southeast from Puerto Rico to the Coast of (A continent in the western hemisphere connected to North America by the Isthmus of Panama) South America.
		Since 1988, the Puerto Rican Seismic Society has been trying to use the (A resident of Puerto Rico) Puerto Rican media to inform people about a future earthquake that could result in a catastrophic tragedy.
	www.absoluteastronomy.com /encyclopedia/p/pu/puerto_rico_trench.htm (526 words)

	Santos : About Puerto Rico
		Puerto Rico is located in the West Indies between the Dominican Republic (to the west) and the U.S. Virgin Islands (to the east).
		With the adoption of an autonomous constitution in 1952, Puerto Rico became known as the Commonwealth of Puerto Rico.
		San Juan is Puerto Rico's capital city and major port, ideally situated on the northeastern portion of the coast.
	www.harn.ufl.edu /santos/about_PR.php (733 words)

	Puerto Rico Trench -- Encyclopædia Britannica
		It lies within a submarine depression called the Puerto Rico Trench, located at the southern edge of the North American Basin, between the Puerto Rico Ridge (north) and the North Antillean Arc (south); it is about 7,000 feet...
		Puerto Rico is largely composed of mountainous and hilly terrain, with nearly one-fourth of the island covered by steep slopes.
		Puerto Rico lies at the eastern end of the major island chain of the Caribbean, the Greater Antilles.
	www.britannica.com /eb/article-9061846?tocId=9061846 (973 words)

	NOAA Ocean Explorer: Puerto Rico trench
		The North American tectonic plate, which lies north of the trench, is descending under the Puerto Rico and Virgin Island blocks south of the trench.
		The southern side of the trench, north of Puerto Rico, is covered with a tilted limestone layer.
		Until now, it was unclear whether the northern insular slope of Puerto Rico continued to tilt and if submarine slides were still active; however, the newly acquired multibeam data and imagery suggest that the slope failure was an initial phase in the landslide process.
	oceanexplorer.noaa.gov /explorations/03trench/welcome.html (1274 words)

	PUERTO RICO HERALD: Caribbean Vulnerable To Killer Tsunamis… (Site not responding. Last check: 2007-10-21)
		SAN JUAN, Puerto Rico (AP) - Scientists predict killer tsunamis could strike the Caribbean, which lacks a warning system even though its seabed is gouged by some of the world's deepest trenches, where the giant waves can be generated by tectonic activity, and its low-lying islands are heavily populated along their coastlines.
		The Puerto Rico Trench -- one of the deepest in the world at 27,355 feet -- is a 560-mile-long underwater canyon and fault line running parallel to this U.S. island territory and east of the Lesser Antilles islands.
		Seismic tensions in the Puerto Rico, Hispaniola and Cayman trenches ringing the Caribbean force tectonic plates to sink under one another as they collide, producing earthquakes, underwater landslides or tsunamis.
	www.puertorico-herald.org /issues2/2005/vol09n04/CaribTsunami.shtml (1811 words)

	Geography
		Puerto Rico was also expected to abide by the tariff provisions of the U.S. and practice free trade between the two countries.
		Puerto Rico's constitution was drawn up immediately by an elected convention, and by March 3, 1952, voters accepted it in a referendum.
		Puerto Rico would have a political observer in Washington, and would be entitled to elect their own political officials back home.
	www.puertoricoinfo.com /geography.htm (8949 words)

	Information about the Puerto Rico Seismic Network (PRSN)
		It was felt in the Dominican Republic and throughout Puerto Rico, with a maximum intensity of IV in the Modified Mercalli Scale (MM) for the western area of the island.
		The seismicity for the Puerto Rico region during 1999 was distributed rather evenly, with a slightly higher concentration of events on the on the northern, eastern and western portions of this area.
		The concentration of seismicity for this year widely was distributed in all the Region of Puerto Rico, nevertheless a greater concentration of earthquakes in the Seismic Zone of the Sombrero and in the southwestern area of the Island exists.
	rmsismo.uprm.edu /English/Seismicity/PRSN-Seismicity.html (1699 words)

	Geography of Puerto Rico (Site not responding. Last check: 2007-10-21)
		20% of Puerto Rico's land is forested, 38% is used for pastures, and 14% is cultivated for agriculture.
		There exists over 1,200 bodies of water in Puerto Rico that can be classified as either rivers, lakes, lagoons, mangroves, thermal pools or streams.
		The national bird of Puerto Rico is the Stripe-headed Tanager (spyndalis zena) ("reina mora").
	www.puertoricoconmigo.com /geography.htm (5849 words)

	USGS, University of New Hampshire, and NOAA Cooperate in Exploring the Puerto Rico Trench
		The Puerto Rico Trench, with water depths exceeding 8,400 m, is the deepest place in the Atlantic Ocean, comparable to the deep trenches in the Pacific Ocean.
		The Puerto Rico Trench, in contrast, is situated at a boundary between two plates that slide past each other with only a small component of subduction.
		The Puerto Rico Trench is also associated with the most negative gravity anomaly on Earth, -380 milliGals, indicating the presence of an active downward force.
	soundwaves.usgs.gov /2002/11/fieldwork3.html (674 words)

	Puerto Rico Tourism Topics (Site not responding. Last check: 2007-10-21)
		The Commonwealth of Puerto Rico lies 1,047 miles south east of Miami and 548 miles north of Caracas, Venezuela.
		Forty-five miles north is the Puerto Rico Trench, also called Bronson's Deep, where the ocean's floor plunges 28,000 feet.
		Puerto Rico's astounding geographic diversity can be experienced within a day's drive.
	www.touristquickguide.com /tourismtopics/naturalattributes.shtml (413 words)

	UNCW scientists examine submarine landslides in the Puerto Rico Trench
		In 1918, an earthquake of magnitude 7.3, centered approximately 15 km off the northwestern coast of Puerto Rico, generated a tsunami that produced a run-up as high as six meters along the western coast of the island (Mercado and McCann, 1998).
		Because the Caribbean Sea is a seismically active region with a history of earthquakes and since 32 tsunamigenic faults have been identified in the Mona Passage, between the Caribbean Islands of Hispaniola and Puerto Rico, the government of Puerto Rico has implemented a tsunami mitigation program.
		The objectives of the project are to quantify the volume of slope-forming material removed in the formation of the scarp located at -66.64° W 18.93° N, map the area of seafloor affected by the debris flow, and evaluate the potential of slope failure given the current tectno-sedimentary environment along the northern margin of Puerto Rico.
	people.uncw.edu /grindlayn/cmgl/scarp.htm (417 words)

	Puerto Rico Tsunami Warning and Mitigation Program (Site not responding. Last check: 2007-10-21)
		Puerto Rico and northern Virgin Islands microplate: GPS geodetic results from 1994-2002.
		Puerto Rico due to submarine landslides along the Puerto Rico Trench.
		Rico Trench: Implications for earthquake and tsunami hazards.
	poseidon.uprm.edu /welcome_3.html (205 words)

	Puerto Rico Trench
		This is a cooperative project involving the University of Puerto Rico, The University of Texas at Austin and the University of Southern California.
		The Puerto Rico Trench and northern margin of the island of Puerto Rico occupy a zone of tectonic transition between subduction tectonics of the Lesser Antilles island arc and strike slip fault system to the west.
		The Main Ridge area of the Puerto Rico Trench is selected as the focus of this study as it appears to be the zone of active collision between elevated fracture zones on the downgoing North America plate and the Puerto Rico island slope of the overriding Caribbean plate.
	www.ig.utexas.edu /research/projects/puerto.rico/puerto.rico.htm (433 words)

	The Geology of Puerto Rico (Site not responding. Last check: 2007-10-21)
		In fact, the whole Caribbean Plate, upon which Puerto Rico, most of Central America (excluding the Yucatan and Southern Mexico) and the rest of the Greater (excluding Cuba) and Lesser Antilles sit, wasn't formed until the midway through the Triassic (ca.
		This zone of sea-floor spreading is pushing the Caribbean Plate to the east where the western Atlantic plate is currently being subducted (as evidenced by the recent eruption of a volcano on Montserrat).
		The subduction of the northern edge of the Caribbean plate that caused the volcanic activity that formed the core of Puerto Rico has been replaced by a left-lateral strike slip motion--that is, the North American Plate is moving westward in relation to the Caribbean Plate.
	cgsc.biology.yale.edu /prgeolog.html (817 words)

	Milwaukee Deep - Wikipedia, the free encyclopedia
		Milwaukee Deep is the deepest part of the Atlantic Ocean, with a maximum depth of 8 605 meters, and is part of the Puerto Rico Trench.
		Its location at 19°35'N, 066°30'W is just 135 km north of the coast of Puerto Rico.
		This ocean floor feature is named for the USS Milwaukee (CL-5), a U.S. Navy Ohmaha class crusier, which discovered the Milwaukee Deep on February 14, 1939.
	en.wikipedia.org /wiki/Milwaukee_Deep (94 words)

	Puerto Rico. The Columbia Gazetteer of North America. 2000
		In the face of an increasingly active movement for statehood, the governor arranged for a plebiscite in 1967 in which Puerto Ricans could choose among independence, statehood, and maintenance of the commonwealth relationship.
		is a 2d language studied by all Puerto Ricans.
		By the late 1950s the commonwealth was able to provide a basic education for all children of elementary school age.
	www.bartleby.com /69/18/P09018.html (1264 words)

	Major Caribbean Earthquakes And Tsunamis A Real Risk
		The Puerto Rico Trench, roughly parallel to and about 75 miles off the northern coast of Puerto Rico, is about 900 kilometers (560 miles) long and 100 kilometers (60 miles) wide.
		Hispaniola, Puerto Rico and the U.S. Virgin Islands sit on top of small crustal blocks that are sandwiched between the North American and Caribbean plates.
		The Puerto Rico Trench, which is capable of producing earthquakes of magnitude 7 to 8 or greater, faces north and east into the Atlantic Ocean.
	www.spacedaily.com /news/tectonics-05j.html (1467 words)

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