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  1. A subduction is a phenomenon in which one part of the Earth's crust (a plate) is pushed underneath another plate as two plates collide. (Web site)
  2. Subduction is the process in which one plate is pushed downward beneath another plate into the underlying mantle when plates move towards each other.
  3. Subduction is the result of the old cold plate sinking below the overriding plate. (Web site)
  4. Subduction is a major process of plate tectonics; however, its initiation is not understood.
  5. Subduction is a process that occurs at convergent plate boundaries.

Subduction Zones

  1. It is at subduction zones that the Earth's lithosphere, oceanic crust, sedimentary layers, and trapped water are recycled into the deep mantle.
  2. The great seismic discontinuities in the mantle - at 410 and 670 km depth - are disrupted by the descent of cold slabs in deep subduction zones. (Web site)
  3. A Wadati-Benioff zone (also Benioff-Wadati zone or Benioff zone) is a deep active seismic area in a subduction zone. (Web site)

Cascadia Subduction Zone

  1. A future rupture of the Cascadia Subduction Zone would cause widespread destruction throughout the Pacific Northwest.
  2. PMID 11313500.   Rogers G, Dragert H (2003). "Episodic tremor and slip on the Cascadia subduction zone: the chatter of silent slip". (Web site)
  3. Recent studies indicate that the Cascadia subduction zone has produced an average of one large quake every 500 years during the past 3,000 years.

Juan De

  1. It formed by subduction of the Gorda and Juan de Fuca plates at the Cascadia subduction zone.
  2. For hundreds of years, these subduction zone plates remain locked, releasing little of their tension. (Web site)
  3. Evidence of marine magnetic band orientation indicates that the Juan de Fuca plates are twisting clock-wise into the subduction zone (Atwater, 1970). (Web site)


  1. Subduction zones are also notorious for producing devastating earthquakes because of the intense geological activity.
  2. In a sense, subduction zones are the opposite of divergent boundaries, areas where material rises up from the mantle and plates are moving apart.
  3. Most subduction zones are arcuate, where the concave side is directed towards the continent. (Web site)
  4. NSF-MARGINSprogram, see especially SEIZE and Subduction Factory initiatives Animation of a subduction zone.
  5. The subduction factory: How it operates in the evolving Earth. (Web site)


  1. Unlike offshore Washington, no subduction-related accretionary m--lange of pervasively sheared or ground-up rocks has been drilled off Vancouver Island.
  2. On the Pacific side there could well have been subduction-related magmatism that was causing volcanoes. (Web site)
  3. Subduction-related hinge rollback and overriding plate extension have emerged as the fundamental shapers of the face of the earth. (Web site)
  4. The Taranaki volcanoes lie 140 km to the west of the Taupo Volcanic Zone (TVZ), the principal locus of subduction-related magmatism in the North Island.


  1. Aleutian arc volcanism is the result of subduction of the Pacific Plate beneath the North American Plate. (Web site)
  2. A forearc is a depression in the sea floor located between an accretionary wedge and a volcanic arc in a subduction zone, and lined with trapped sediment.
  3. Magmatism associated with subduction occurred not near the plate edges (as in the volcanic arc of the Andes, for example), but far to the east. (Web site)
  4. Sliver arcs are in fact routinely computed for subduction faults.


  1. This time watch and be impressed by the subduction; an astonishingly huge area of oceanic plate was subducted beneath North America.
  2. The Cascadia subduction zone is where the oceanic Juan de Fuca plate is being subducted under the continental North American plate.
  3. Christensen's flat-slab subduction model has the subducted slab descending through the asthenosphere until it hits a dense layer and flattens out.

Oceanic Trenches

  1. Subduction zones are marked by oceanic trenches.
  2. Subduction causes oceanic trenches, such as the Mariana trench.


  1. The forearc is continuously subjected to subduction-related earthquakes.
  2. The weakness of the Cascadia subduction thrust fault and the unusual stress state of the forearc region have important implications for earthquake hazards. (Web site)

Northern California

  1. The Cascadia subduction zone is a very long sloping fault that stretches from mid- Vancouver Island to northern California.
  2. The Cascadia Subduction Zone is a very long sloping fault that stretches from mid-Vancouver Island to Northern California. (Web site)

Oceanic Lithosphere

  1. Subduction erosion may also diminish a once-robust accretionary prism if the flux of sediments to the trench diminishes.
  2. As a result, they are less explosive than subduction zone volcanoes, in which water is trapped under the overriding plate. (Web site)
  3. Subduction zones exist at convergent plate boundaries where one plate of oceanic lithosphere converges with another plate and sinks below into the mantle.
  4. Subsequent subduction and rollback of backarc oceanic lithosphere led to arc splitting and backarc basin formation (e.g. (Web site)
  5. Return flow around the slab edge probably cause subduction volcanoes to tap reservoirs outside the mantle wedge region. (Web site)


  1. Island arcs are created by the friction of subduction which creates hot plumes of magma at the interface of the two plates. (Web site)
  2. The locked part of the subduction interface is known as the megathrust.

Convergent Plate

  1. The Cascadia subduction zone is a subduction zone, a type of convergent plate boundary that stretches from northern Vancouver Island to northern California.
  2. Convergent margins experiencing subduction erosion are called nonaccretionary convergent margins and comprise more than half of convergent plate boundaries.


  1. The Puerto Rico trench is at a complex transition from the subduction boundary to the south and the transform boundary to the west.
  2. This boundary is in part the result of transform faulting along with thrust faulting and some subduction.
  3. Subduction zones occur where an oceanic plate meets a continental plate and is pushed underneath it.
  4. Resisting subduction, the crust buckles up and under, raising mountains where a trench used to be.
  5. Unlike most subduction zones worldwide, there is no oceanic trench present along the continental margin in Cascadia. (Web site)


  1. This would effectively stop plate tectonics unless new subduction zones start up, but subduction initiation is poorly understood. (Web site)
  2. Toth, J. & Gurnis, M. (1998). Dynamics of subduction initiation at pre-existing fault zones. (Web site)
  3. The Seismogenic Zone Experiment (SEIZE): Science Plan 1) is one manifestation of the diversity of subduction zones. (Web site)


  1. Where lithosphere on the downgoing plate is too buoyant to subduct, a collision occurs, hence the adage "Subduction leads to orogeny ".
  2. Bathymetry shows the regional interaction of aseismic, buoyant highs in northern Pacific subduction zones. (Web site)

Megathrust Earthquake

  1. At a subduction boundary the motion is due to one plate slipping beneath the other plate resulting in an interplate thrust or megathrust earthquake. (Web site)
  2. The 1700 Cascadia Earthquake was a magnitude 8.7 --- 9.2 megathrust earthquake that occurred in the Cascadia subduction zone in 1700. (Web site)

Large Earthquakes

  1. Because earthquakes can only occur when a rock is deforming in a brittle fashion, subduction zones have the potential to create very large earthquakes.
  2. The Cascadia subduction zone can produce very large earthquakes, magnitude 9.0 or greater, if rupture occurred over its whole area.


  1. It seems that most obductions are initiated at supra-subduction, back-arc basins.
  2. This is especially so where a back-arc basin develops between the subduction zone and the continent.


  1. Encyclopedia of Keywords > Time > Events > Earthquakes
  2. Encyclopedia of Keywords > Places > Earth
  3. Encyclopedia of Keywords > Thought
  4. Glossaries > Glossary of Plate Tectonics /


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  Originally created: March 24, 2008.
  Links checked: February 10, 2013.
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