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Topic: Oceanic trench

Related Topics

Aleutian Trench

Ryukyu Trench

Kuril Trench

List of oceanic trenches

Richards Deep

Japan Trench

Tonga Trench

Cayman Trench

Trench warfare

Pacific Ring of Fire

Oceanic ridge

Marianas Trench

Island arc

Plate tectonics

Kuril Islands

	Oceanic trench Encyclopedia (Site not responding. Last check: 2007-10-29)
		Trenches along with volcanic arcs and zones of earthquakes that dip under the volcanic arc as deeply as 700 km are diagnostic of convergent plate boundaries and their deeper manifestations, subduction zones.
		Trenches are centerpieces of the distinctive physiography of a convergent plate margin.
		Trenches distant from an influx of continental sediments lack an accretionary prism, and the inner slope of such trenches is commonly composed of igneous or metamorphic rocks.
	www.hallencyclopedia.com /topic/Oceanic_trench.html (3851 words)

	Oceanic trench - Wikipedia, the free encyclopedia
		Trenches along with volcanic arcs and zones of earthquakes that dip under the volcanic arc as deeply as 700 km are diagnostic of convergent plate boundaries and their deeper manifestations, subduction zones.
		Trenches are centerpieces of the distinctive physiography of a convergent plate margin.
		Trenches distant from an influx of continental sediments lack an accretionary prism, and the inner slope of such trenches is commonly composed of igneous or metamorphic rocks.
	en.wikipedia.org /wiki/Oceanic_trench (3732 words)

	ScienceDaily: Oceanic trench (Site not responding. Last check: 2007-10-29)
		The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor.
		Oceanic lithosphere disappears into trenches at a global rate of about a tenth of a square metre per second.
		Oceanic trench -- The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor.
	www.sciencedaily.com /encyclopedia/Oceanic_trench (1597 words)

	Oceanic trench Summary
		A deep-sea trench is a narrow, elongate, v-shaped depression in the ocean floor.
		Trenches and active subduction zones are found along much of the Ring of Fire, a zone of volcanism and earthquake activity that borders the Pacific ocean.
		The concept of downwelling at trenches was characterized by Griggs in 1939 as the tectogene hypothesis, for which he developed an analog model using a pair of rotating drums.
	www.bookrags.com /Oceanic_trench (4120 words)

	Thai Marine Meteorology (Site not responding. Last check: 2007-10-29)
		These trenches mark the location where great slabs of oceanic crust are being reabsorbed back into the Earth by a process called subduction (see subduction zone), which generates the seismic activity along the boundaries of the Pacific Ocean basin.
		This process is active along the Aleutian Trench to the north, the Kuril-Japan-Marianas Trench System and the Mindanao Trench to the west, the New Hebrides, Tonga, and Kermadec trenches to the south, and the Middle American and Peru-Chile trenches to the east.
		New oceanic crust is being produced in the Pacific Ocean basin along the East Pacific Rise in the southern and eastern parts of the basin.
	www.tmd.go.th /~marine/html/oceansea.htm (3653 words)

	:: trenh :: related - ( trench coat leather coats man mafia womens ...
		dig a trench or trenches in (the ground).
		trench fever a highly infectious disease transmitted by lice, that infested soldiers in the trenches in the war of 1914-18.
		trench mortar a light simple mortar throwing a bomb from one's own into the enemy trenches.
	www.spell-dictionary.com /db/trenh (162 words)

	Tectonic Pause: Towards the Unification of Earth Sciences - Karunakar Marasakatla
		In this period the oceanic plate remains stationary and the continental plate rapidly slides on the oceanic crust.
		While the oceanic plate is being subducted at the trench, the ridge associated with the oceanic plate also moves towards the trench.
		Pull of the oceanic plate under the continental plate exerts the force on the continental plate and lifts the continent at the SP.
	www.geocities.com /karunakarm/unifiedtheory.html (8181 words)

	Highbeam Encyclopedia - Search Results for Oceanic
		The lithosphere consists of the heavy oceanic and lighter continental crusts, and the uppermost portion of the mantle.
		Oceanic migration rates of Upper Chesapeake Bay striped bass (Morone saxatilis), determined by otolith microchemical analysis *.
		Genetic Diversity of Oceanic Island Lasaea (Mollusca: Bivalvia) Lineages Exceeds That of Continental Populations in the Northwestern Atlantic.
	www.encyclopedia.com /SearchResults.aspx?Q=Oceanic&StartAt=11 (949 words)

	Oceanic trench - Definition, explanation
		Trenches along with volcanic arcs and zones of earthquakess that dip under the volcanic arc as deeply as 700 km are diagnostic of convergent plate boundaries and their deeper manifestations, subduction zones.
		The heroic phase of trench exploration culminated in the 1960 descent of the bathyscaphe “Trieste”;, which set an unbeatable world record by diving to the bottom of the Challenger Deep.
		Trenches form where oceanic lithosphere is subducted at a convergent plate margin, presently at a global rate of about a tenth of a square meter per second.
	www.calsky.com /lexikon/en/txt/o/oc/oceanic_trench.php (3649 words)

	deep-sea trench - Britannica Concise
		Philippine Trench - submarine trench in the floor of the Philippine Sea of the western North Pacific Ocean bordering the east coast of the island of Mindanao.
		The Yap Trench is about 400 miles (650 km) long from north to south and reaches a maximum depth of 27,976 feet (8,527 m) some 300 miles (480 km) northeast of the Palau Islands.
		Ryukyu Trench - deep ocean trench running north along the eastern edge of the Ryukyu Islands (Japan) in the Philippine Sea, between Taiwan and the Japanese archipelago.
	concise.britannica.com /ebc/article-9362416 (571 words)

	Shock Dynamics: Oceanic Crust
		Trenches (green line) along the leading edges of landmasses result from the rapid application of the weight of continental crust.
		The first and most common is that as the oceanic lithosphere ages and cools, its density increases so that an instability arises and the plate sinks spontaneously in the mantle under its own weight.
		One suggestion was "that with a weaker oceanic lithosphere, such as that occurring through the addition of water to olivine, that a throughgoing shear zone could develop directly on the edge of a 10 km thick sedimentary pile." (Gurnis p.
	www.newgeology.us /presentation8.html (1192 words)

	Earth and Space Science \| Session 4
		A deep trench forms on the ocean floor at the location where one oceanic plate subducts under another.
		Off the coast of South America, along the Peru-Chile trench, the oceanic Nazca Plate is being subducted beneath the continental South American Plate.
		Helens is found, is another example of a volcanic arc formed by the convergence of oceanic and continental plates.
	www.learner.org /channel/courses/essential/earthspace/session4/closer2.html (693 words)

	The EXPANDING EARTH - Geology
		The Pacific "trenches" are not areas of oceanic crustal consumption but are morphological artefacts of Pacific ocean basin curvature adjustment, as well as oblique upper mantle decoupling responses to the inevitable mantle curvature change which is concentrated at continental and active island-arc margins (controlled by crustal 'roots') within the Pacific basin.
		The north-west Pacific's oceanic crust is largely of Jurassic age and hence, in an expansion interpretation, was extruded from the mantle at a Jurassic palaeo-radius, and a correspondingly higher surface curvature (quantitative modelling, of pre-Jurassic Earth indicates palaeo-radius ~50 % present).
		Oceanic crust forms directly from to the top of the mantle being exposed at mid ocean ridges as Earths' waxing internal expansion pulls the crust apart at submerged rifting fissures commonly called mid-ocean-ridges.
	www.geocities.com /CapeCanaveral/Launchpad/8098/1.htm (13217 words)

	Volcanoes
		Along deep oceanic trenches, the oceanic slab is thrust or subducted into the mantle bringing with it water from the ocean (see Figure 1).
		But they are unsure to what extent the subducting oceanic sediments and/or oceanic crustal material mixes with the mantle and to what extent the thin arc crust immediately beneath the volcanoes contributes to the chemistry of the lavas that these volcanoes produce.
		The volcanoes are close together, which helps to minimize variations in other parameters that might influence the volcanoes' chemistry--the depth to the subducting oceanic slab, distance to the oceanic trench, thickness of the arc crust, and composition of the mantle and subducting oceanic crust and sediments.
	www.llnl.gov /str/Kersting.html (1169 words)

	Trench - Wikipedia, the free encyclopedia
		a temporary trench for burying a pipeline, cable, etc.
		Trench, Telford is a place in Telford, Shropshire, England
		This is a disambiguation page: a list of articles associated with the same title.
	en.wikipedia.org /wiki/Trench (91 words)

	Geology (Site not responding. Last check: 2007-10-29)
		Subduction zones are regions of the Earth that are defined by deep trenches, lines of volcanoes parallel to the trenches, and zones of large earthquakes dipping from the trenches landward beneath the volcanoes.
		The forearcs of subduction zones, between the trench and the volcanic arc, are where much of the mechanical interaction between the overriding and subducting plates occurs.
		Grabens (fault-bounded basins) develop in the lower plate as it bends into the trench; as the graben pass beneath the forearc, pieces of the forearc collapse into the graben and are carried down into the mantle.
	www.utdallas.edu /dept/sci_ed/Melville/g_whatisasubductionzone.html (2762 words)

	subduction zone -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-29)
		oceanic trench area marginal to a continent in which, according to the theory of plate tectonics, older seafloor underthrusts the continental mass, dragging downward into the Earth's upper mantle the accumulated trench sediments.
		The subduction zone, accordingly, is the antithesis of the mid-oceanic ridge; new seafloor is generated from the upper mantle at the...
		The volcanoes overlie a zone of intense earthquake activity that begins at a shallow depth near such a trench and that dips beneath the volcanoes.
	www.britannica.com /eb/article-9070092?tocId=9070092 (795 words)

	Understanding plate motions [This Dynamic Earth, USGS]
		Trenches are the deepest parts of the ocean floor and are created by subduction.
		Land on the west side of the fault zone (on the Pacific Plate) is moving in a northwesterly direction relative to the land on the east side of the fault zone (on the North American Plate).
		Oceanic fracture zones are ocean-floor valleys that horizontally offset spreading ridges; some of these zones are hundreds to thousands of kilometers long and as much as 8 km deep.
	pubs.usgs.gov /gip/dynamic/understanding.html (2502 words)

	Mantle Convection with Faults (Site not responding. Last check: 2007-10-29)
		An oceanic trench with width and depth consistent with those from instantaneous flow models (12) forms on the oceanic plate near the converging marg in (Fig.
		This relation between slab morphology and trench migration is similar to the correspondence between slab morphology revealed through seismic tomography studies and plate reconstruction (7).
		The fault parameterization used in the convection formulation is based on the ability to match present day dependence of oceanic trench depth versus plate age, angle of decoupling zone, and slab dip angle (12).
	www.gps.caltech.edu /~gurnis/Papers/Conv_Sci/fault_convec_sci.html (5023 words)

	CVO Website - Plate Tectonics and Sea-Floor Spreading
		In a typical "oceanic" environment, volcanoes are alined along the crest of a broad ridge that marks an active fracture system in the oceanic crust.
		As with oceanic-continental convergence, when two oceanic plates converge, one is usually subducted under the other, and in the process a trench is formed.
		The trenches are the key to understanding how island arcs such as the Marianas and the Aleutian Islands have formed and why they experience numerous strong earthquakes.
	vulcan.wr.usgs.gov /Glossary/PlateTectonics/description_plate_tectonics.html (8248 words)

	Geology 300 with Terry J. Boroughs: Plate Tectonics, Oceans, and Mtn. Building (Site not responding. Last check: 2007-10-29)
		the oceanic crust is youngest adjacent to the continents
		the oceanic crust is youngest adjacent to spreading ridges
		fragments of oceanic lithosphere emplaced on a continent
	www.arc.losrios.edu /~borougt/FS_PlateTectonicsOceansMountainsHomework.htm (1360 words)

	false
		OCEANIC RIDGE: A range of mountains on the ocean floor caused by upwelling of magma.
		Continental crust and oceanic crust have roughly the same composition and age.
		The Atlantic midoceanic ridge is paralleled by a trench.
	einstein.byu.edu /~masong/HTMstuff/falseC28Q1.html (450 words)

	Basin Topography
		Volcanoes and earthquakes are caused by the subduction of the oceanic plate under the continental plate (see section on plate tectonics).
		A trench is formed at the subduction site and sediments eroding from the continent accumulate on the shelf or are transported into the trench (continental rises are generally absent on active margins because the presence of the trench doesn't allow for sediment to accumulate).
		There are a total of 26 oceanic trenches in the world- 22 of which are found in the Pacific Ocean (3 in the Atlantic Ocean and only 1 in the Indian Ocean).
	www.odp.usyd.edu.au /odp_CD/slope/slindex2.html (2635 words)

	GEOPECO publications (Site not responding. Last check: 2007-10-29)
		The oceanic Nazca Plate is divided by Mendana Fracture Zone (MFZ) which marks a transition zone of a different crustal age of approximately 28 Ma in the north to 38 Ma in the south at the Peruvian trench.
		The oceanic crust south of MFZ is overall homogeneous with a thin pelagic sedimentary layer and normal oceanic crustal layers.
		Seaward of the trench, the oceanic Moho of the Nazca Plate (10 Ma younger age (28 Ma)) is modeled with a thickness of 7 km, 3 km thinner than on the southern lines.
	www.geomar.de /projekte/geopeco/publications_e.html (12555 words)

	deep-sea trench -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-29)
		Trenches generally lie seaward of and parallel to adjacent island arcs or mountain ranges…
		submarine trench in the floor of the Philippine Sea of the western North Pacific Ocean bordering the east coast of the island of Mindanao.
		It is a part of the chain of trenches that begins at the southwestern edge of the Bering...
	www.britannica.com /eb/article-9029727 (1051 words)

	Chapter 7 Test Preview
		Oceanic crust is neither created nor destroyed along this type of boundary.
		Since oceanic crust is continually being produced, the size of Earth is increasing.
		The hypothesis which proposed that sea floor was continually forming at the mid-ocean ridges while older sea floor was being destroyed at the trenches was later termed ____________.
	ourworld.cs.com /mrbutlerunion/Pre7tst.htm (1518 words)

	My Web of Information on Geography -&--&- (Site not responding. Last check: 2007-10-29)
		Each plate is about 80 kilometers (50 miles) thick and can be pictured as having a shallow part that deforms by elastic bending or by brittle breaking, and a deeper part that yields plastically, beneath which is a viscous layer on which the entire plate slides.
		Generally, an oceanic plate slides ("subducts") beneath a continental plate (for example, along the west coast of South America) or another oceanic plate (for example, the east side of the Philippine Sea plate).
		A trench is formed where the under-sliding plate tips down, and the ocean-floor sediment it carries is scraped off against the front of the overriding plate.
	www.freewebs.com /geographyhelp/earthquakesactivevolcanoe.htm (7318 words)

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