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	Juan de Fuca Plate - Wikipedia, the free encyclopedia
		The Juan de Fuca Plate, named after the explorer, is a tectonic plate arising from the Juan de Fuca Ridge, and subducting under the northerly portion of the western side of the North American Plate.
		It is bounded on the south by the Blanco Fracture Zone, on the north by the Nootka Fault, and along the west by the Pacific Plate.
		The central piece retains the Juan de Fuca name, whereas the piece to the south is known as the Gorda Plate and the piece to the north is known as the Explorer Plate.
	en.wikipedia.org /wiki/Juan_de_Fuca_Plate (240 words)

	Juan de Fuca Plate Tectonics
		The three plates are: the Juan de Fuca, the Pacific and the North American Plate.
		The Juan de Fuca Plate is a small plate trapped in between the Pacific and the North American Plates.
		It's magnitude was 6.8 and because it was in Washington, it was on the Juan de Fuca Plate.
	www.archerstudents.org /HorrocksTechnology/RainforestWebsites/Section_6-1/hicks.htm (368 words)

	juan_de_Fuca_general
		The Juan de Fuca microplate system of the Pacific Northwest in the United States (U.S.) and southern British Columbia is an interesting area of study for the field of tectonic geology.
		Toward the end of the Farallon plate portions of the Farallon plate were entirely subducted under the North American plate and the Pacific-North American plate boundary began to dominate the western U.S. The Pacific plate has different characteristics and a different vector (tending NE related to North American plate motion) then the Farallon plate.
		This divergent zone is composed of three major sea mount ridges (the Gorda, Juan de Fuca, and the Explorer ridges) which feed both the Juan de Fuca microplates to the west and the Pacific plate to the east.
	www.colorado.edu /GeolSci/Resources/WUSTectonics/PacNW/juan_de_Fuca_general.html (757 words)

	Pacific Plate - Encyclopedia, History, Geography and Biography
		The Pacific Plate is an oceanic tectonic plate beneath the Pacific Ocean.
		To the north the easterly side is a divergent boundary with the Explorer Plate, the Juan de Fuca Plate and the Gorda Plate forming respectively the Explorer Ridge, the Juan de Fuca Ridge and the Gorda Ridge.
		The westerly side is a convergent boundary subducting under the Eurasian Plate to the north and the Philippine Plate in the middle forming the Mariana Trench.
	www.arikah.com /encyclopedia/Pacific_Plate (262 words)

	CVO Website - Plate Tectonics and Sea-Floor Spreading
		In Washington State, the small Juan de Fuca plate off the coast of Washington, Oregon, and northern California is slowly moving eastward beneath a much larger plate that includes both the North American continent the land beneath part of the Atlantic Ocean.
		The movement of the Juan de Fuca plate beneath the North America plate is in many respects similar to the movements of plates in South America, Mexico, Japan, and Alaska, where the world's largest earthquakes occur.
		In sum, the subduction of the Juan de Fuca plate beneath the North America plate is believed to directly or indirectly cause most of the earthquakes and young geologic features in Washington and Oregon.
	www.uic.edu /classes/psych/psych353/role/quakept.html (614 words)

	WA Earthquake Hazards - What Causes Earthquakes?
		Plates are thick slabs of rock that make up the outermost 100 kilometers or so of the Earth.(Figure 8) Geologists use the term tectonics to describe deformation of the Earth's crust, the forces producing such deformation, and the geologic and structural features that result.
		The Juan de Fuca plate off the coasts of Washington and Oregon is subducting beneath North America (Figure 11).
		The Cascadia subduction zone off the coasts of Washington, Oregon, and northern California is a convergent boundary between the large North America plate and the small Juan de Fuca plate to the west (Figures 11, 12).
	www.geophys.washington.edu /SEIS/PNSN/INFO_GENERAL/NQT/what_causes.html (1196 words)

	Plate Interior Studies
		Plates can be thought of simply as the mechanical consequence of the thermal boundary layer from convection in the upper mantle.
		The Juan de Fuca Plate provides an ideal setting for many studies that would benefit from long-term time-series observations, and the characteristics that combine to make this true are multifold.
		Third, as pointed out in the previous section, there is substantial seismic activity within the Juan de Fuca plate, and this provides excellent "signals" for studying such things as the intraplate stress regime and the linkages between seismic events or seismic ground motion and the hydrologic regime of the sediments and crust.
	www.neptune.washington.edu /pub/white_paper/scidriv4.html (1194 words)

	Understanding plate motions [This Dynamic Earth, USGS]
		Plate boundary zones -- broad belts in which boundaries are not well defined and the effects of plate interaction are unclear.
		Even though the Nazca Plate as a whole is sinking smoothly and continuously into the trench, the deepest part of the subducting plate breaks into smaller pieces that become locked in place for long periods of time before suddenly moving to generate large earthquakes.
		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).
	pubs.usgs.gov /publications/text/understanding.html (2502 words)

	[No title]
		The Juan de Fuca plate is being pushed away from the sub-ocean ridge of the same name toward the coast at a rate of about 1.5 inches per year.
		In this plate convergence, the Juan de Fuca plate, as it drifts to the northeast, is being overridden by the North American plate.
		Shallow earthquakes that occur in the North American plate, as it is internally deformed due to strain caused by overriding the Juan de Fuca plate in the convergence process.
	www.doi.gov /ocl/2001/earthquake.htm (3652 words)

	Plate Motions
		Notice that the plate motion is NOT orthogonal to the mid-ocean ridge, but at an angle; this will be an important reason why the oceanic plates move northward, causing the "yet-to-be-created" San Andreas fault to lengthen.
		As soon as the ridge contacts the subduction zone, and the Farallon plate is essentially split into two parts, we redefine the plates as the Juan de Fuca plate (labeled; the northern subduction zone) and the Gorda plate (not labeled; the southern subduction zone).
		The shrinking Juan de Fuca subduction zone lies to the north of the fault.
	www.geology.wisc.edu /~g109/Additional/plate_motions.htm (618 words)

	Where do earthquakes occur?
		The plates of the world: map illustrating the various plates and plate boundaries which constitute the surface of the Earth.
		Further east, the Juan de Fuca plate is converging with and sliding beneath the North American plate.
		Another small plate, the Explorer, is also sliding underneath the North American plate, and at the same time the Juan de Fuca plate is sliding past it along the Nootka fault.
	www.em.gov.bc.ca /Mining/Geolsurv/Surficial/quake/eq3.htm (570 words)

	Gravity and Magnetic data: MENDOCINO TRIPLE JUNCTION
		Along this trench to the north, the Juan de Fuca plate is subducting eastward beneath the North American plate.
		The south edge of the Juan de Fuca plate lies beneath the North American plate at the shore about 20 km south of Cape Mendocino and can be identified by an east-west magnetic anomaly (Griscom, 1980a), as well as by the distribution of seismicity (Hutchings and others, 1981).
		The spatial coincidence between the position of the Cape Mendocino gravity anomaly at the coast and the place where the south edge of the Juan de Fuca plate passes beneath the coastline strongly suggests that this gravity anomaly reflects the south edge of the subducted plate (fig.
	www.johnmartin.com /earthquakes/eqsafs/safs_936.htm (1677 words)

	Juan de Fuca Ridge Publications
		Geochronology and petrogenesis of MORB from the juande fuca and gorda ridges by U-238-Th-230 disequilibrium.
		Johnson, H. P., Tectonic regulation of the physical properties of the seafloor: The view from the Juan de Fuca Ridge, in Proceedings of a Workshop on the Physical Properties of Volcanic Seafloor, edited by G. Purdy and G. Fryer, 55-72, Woods Hole Oceanographic Institution, Woods Hole, MA, 1990.
		U.S.G.S. Juan de Fuca Ridge Study Group, Submarine fissure eruptioand hydrothermal vents on the southern Juan de Fuca Ridge: Preliminary observations from the submersible Alvin, Geology, 14, 823-827, 1986.
	www.pmel.noaa.gov /vents/coax/jdfr.html (1879 words)

	TESTIMONY
		The tectonic setting of the Pacific Northwest is complex due to the convergence of the Juan de Fuca plate and the North American plate, as shown in Figure 1.
		In this plate convergence, the Juan de Fuca plate, as it drifts to the northeast, is being overridden by the North American plate.
		Although the buildup of strain along the Cascadia subduction zone fault and internally within the two plates is a continuous process, the release of this strain is not.
	www.house.gov /science/research/mar21/filson.htm (3775 words)

	GOMaP Pilot Project
		Complete mapping of the Juan de Fuca plate at a spatial resolution of on the order of 100 – 200 meters will provide an unprecedented, continuous, homogeneous, high-resolution image of a remarkably complete subset of earth processes that will be an invaluable aid to a wide range of scientific endeavors.
		The Juan de Fuca plate is a microcosm of the global plate tectonic system, with ridge crest spreading and hydrothermal processes, faulting, and subduction, represented in a relatively small and accessible area (Fig 2).
		The Juan de Fuca plate is easily accessible and of a size and depth range that allow it to be mapped in a rational length of time and thus at a reasonable cost.
	www.neptune.washington.edu /pub/documents/gomap_pilot.html (2821 words)

	CVO Website - Juan de Fuca Volcanics
		The boundary between the Pacific and Juan de Fuca Plates is marked by a broad submarine mountain chain about 500 kilometers long, known as the Juan de Fuca Ridge.
		As the denser plate of oceanic crust is forced deep into the Earth's interior beneath the continental plate, a process known as subduction, it encounters high temperatures and pressures that partially melt solid rock.
		The Explorer Plate separated from the Juan de Fuca approximately 4 million years ago and is apparently no longer being subducted (Hyndman, et.al., 1979); the Gorda split away between 18 and 5 million years ago (Riddihough, 1984).
	vulcan.wr.usgs.gov /Volcanoes/JuanDeFucaRidge/description_juan_de_fuca.html (1334 words)

	Richard N. Hey - Juan de Fuca
		The oblique magnetic anomaly offsets in the Juan de Fuca area, where magnetic stripes on the seafloor were first discovered by Raff and Mason, had been a puzzle since before seafloor spreading was discovered.
		The competing school said plate tectonics did not work in this area where the young Juan de Fuca plate was converging with and being subducted under the North American plate, and this was the scale where rigid plate tectonics broke down, with the faults resulting from this deformation.
		Because of the difficulty in visualizing plate tectonic evolution with changing plate boundary geometry, the propagating rift explanation for this classic area was not generally accepted until we began to make computer graphics animation movies showing how multiple propagating rifts produced the complex Juan de Fuca anomaly pattern.
	www.soest.hawaii.edu /~hey/juan.html (628 words)

	Juan de Fuca Plate (via CobWeb/3.1 planetlab1.netlab.uky.edu) (Site not responding. Last check: 2007-10-16)
		A map of the Juan de Fuca Plate The Juan de Fuca Plate is a tectonic plate subducting under the northerly portion of the western side of the North American Plate.
		It is bounded on the south by the San Andreas Fault and along the west by the Pacific Plate.
		The central piece retains the Juan de Fuca name, whereas the southern piece is known as the Gorda Plate and the northern piece is known as the Explorer Plate.
	juan-de-fuca-plate.kiwiki.homeip.net.cob-web.org:8888 (346 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The Juan de Fuca plate is a small oceanic plate between the Pacific and North America plates.
		The magnitude of differential stress increases from north to south; this is inferred from the plastic yielding and distribution of earthquakes throughout the Gorda deformation zone.
		We conclude that the right-lateral shear motion of the Pacific and North America plates is primarily responsible for the stress pattern of the Juan de Fuca plate.
	library.iem.ac.ru /j-geophys/toc/2_1/96JB03114/96JB03114.html (335 words)

	Deep Quakes in Washington and Oregon
		These earthquakes are caused by mineral changes as the plate goes to deeper depths and is exposed to increased temperature and pressure.
		The depth of the subducting Juan de Fuca (JDF) Plate is known from several lines of evidence.
		For each square, the strike (see the glossary) of the subducting plate is indicated by the long top of the T shape, and the dip (see the glossary) direction by the short leg of the T. The depth and dip are given below each point.
	www.geophys.washington.edu /SEIS/PNSN/INFO_GENERAL/platecontours.html (664 words)

	Untitled (Site not responding. Last check: 2007-10-16)
		The Juan de Fuca Ridge is the boundary between the Pacific and the Juan de Fuca plates.
		The Jaun de Fuca Ridge is to the West of the North American Plate.
		The Juan* De Fuca Ridge is in between the Pacfic Plate and the Juan de Fuca Plate.
	www.bisdragons.com /students2001/oceans/ridges/juan_de_fuca.html (166 words)

	The Juan de Fuca plate: a sticky situation; is the Pacific Northwest headed for an earthquake of catastrophic ... (Site not responding. Last check: 2007-10-16)
		The oceanic plate sticks as it is forced to slide under the continental plate, building up a tremendous strain along this interface, which gives way periodically with an earth-shaking release of energy.
		Among subducting plates, the Juan deFuca is a youngster.
		Because the Juan de Fuca plate is soyoung when it subducts, it is still relatively warm and buoyant compared with older subducting plates.
	www.findarticles.com /p/articles/mi_m1200/is_v132/ai_5101290 (885 words)

	Plate Tectonics, the Cause of Earthquakes (Site not responding. Last check: 2007-10-16)
		The plates consist of an outer layer of the Earth, the lithosphere, which is cool enough to behave as a more or less rigid shell.
		Plate boundaries in different localities are subject to different inter-plate stresses, producing these three types of earthquakes.
		A close-up topographic picture of the Juan de Fuca spreading ridge, offshore of the Pacific Northwest, shows the turned-up edges of the spreading center.
	www.seismo.unr.edu /ftp/pub/louie/class/100/plate-tectonics.html (953 words)

	Washington's Coast: Hazards - Offshore Fault Zone (Site not responding. Last check: 2007-10-16)
		Part of the earth's crust, the Juan de Fuca Plate, is spreading away from the Pacific plate, several hundred miles offshore.
		The Juan de Fuca plate is being pushed under the North American plate -- a process called subduction.
		The Juan de Fuca Plate is pushing deep under the North American Plate.
	www.ecy.wa.gov /programs/sea/coast/waves/fault.html (411 words)

	Earthquakes in Southwest British Columbia (Site not responding. Last check: 2007-10-16)
		Pacific plates are separated by the much smaller Juan de Fuca Plate, a fragment of ocean floor that is sliding down under the continental margin.
		Although earthquakes are frequent within both plates in the Juan de Fuca subduction zone, no significant earthquake activity is known to have occurred along the actual interface where the Juan de Fuca Plate descends.
		The plates could be sliding over each other smoothly, but it is also possible that the subducting Juan de Fuca Plate is 'stuck' and will snap loose some time in the form of a great earthquake.
	chci.wrdsb.on.ca /library/bc.htm (571 words)

	juan_de_Fuca_advanced
		This 500km divergent zone (Brantley, 1994) is composed of three major sea mount ridges (the Gorda, Juan de Fuca, and the Explorer ridges) approximately 8km wide (Brantley, 1994) which feed both the Juan de Fuca microplates to the west and the Pacific plate to the east.
		The shape of the subducting plate at the bend in the subduction zone is an issue of significant controversy.
		One explanation is that the normal dip of the Juan de Fuca plate (~65deg) (Swanson, 1989) at the point subduction zone bend has a shallow angle of dip (11-40deg).
	www.colorado.edu /GeolSci/Resources/WUSTectonics/PacNW/juan_de_Fuca_advanced.html (934 words)

	Geotimes - June 2006 - Plate shifts in the Pacific Northwest
		In an area known as the Triple Junction, the small Juan de Fuca Plate meets the gigantic Pacific and North American plates.
		Parts of the Juan de Fuca Plate, including the Explorer microplate on the northern end and the Gorda microplate on the southern end, have been diving beneath the North American Plate, making it a subduction zone for the past 4 million years.
		As Dziak’s team reported in the March Geology, the Triple Junction plates are migrating toward the southeast, and the Juan de Fuca subduction zone already looks more like a “transform boundary” — where plates slide past one another — than a subduction zone.
	www.agiweb.org /geotimes/june06/NN_plateshifts.html (478 words)

	CascadiaSubduction-Sci-52501
		Modeling of geodetic data (3) indicates that the shallow, upper ~20 km of the plate boundary fault is currently "locked" (not slipping) because of frictional resistance on the fault interface.
		Continued relentless motion of the plates and aseismic slip increase stresses on the overlying earthquake fault.
		Subdiction of the Juan de Fuca plate beneath the North American plate results in the formation of the Cascade Range.
	ajdubre.tripod.com /Physics/CascadiaSubduction-Sci-52501.html (1094 words)

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