from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A geologic process in which one edge of one crustal plate is forced below the edge of another.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The action of being pushed or drawn beneath another object.
  • n. The act of subducting or taking away.
  • n. Arithmetical subtraction.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of subducting or taking away.
  • n. Arithmetical subtraction.

from The Century Dictionary and Cyclopedia

  • n. The act of subducting, taking away, or withdrawing.
  • n. Arithmetical subtraction.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate


French, from Latin subductus, past participle of subdūcere, to draw away from below : sub-, sub- + dūcere, to lead.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin subductio. (Wiktionary)


  • This blue line here, that's what we call the subduction zone, so that's kind of where the plates, one lays on top of the other.

    CNN Transcript Apr 14, 2008

  • The fault involved in the Fukushima Dai-ichi tsunami is part of what is known as a subduction zone.

    The Full Feed from

  • Most earthquakes that generate tsunamis - including Friday's jolt off Japan's eastern coast - occur in areas called subduction zones, where pieces of the Earth's crust press against each other.

    What Causes a Tsunami?

  • Tremors are common throughout Japan, and this one was near the Japan Trench, where the Pacific plate, the speediest of the earth's major slabs of crust, dives beneath the islands of Japan in what's called a subduction zone.

    Japan: The 'Big One' hit, but not where they thought it would

  • Sendai was a result of something far more dangerous: a so-called subduction zone, a deep-lying discontinuity caused by one plate slowly burying itself under another.

    Jeff Wise: Could a Sendai-Sized Quake Hit the US?

  • A tsunami happens when a crustal plate, a crust -- you know you talk about the plates on the earth -- they move all around -- when it's called subduction -- when one is going down and the other one is moving over it and all of a sudden it pops up.

    CNN Transcript Jan 12, 2010

  • The region where subduction takes place is called a subduction zone and usually results in a deep ocean trench such as the "Mariana Trench" in the western Pacific Ocean.

    AP Environmental Science Chapter 3- The Solid Earth

  • All of the rock types described above can be returned to the Earth's interior by tectonic forces at areas known as subduction zones.

    Rock cycle

  • And that is called the subduction plate shift, or subduction -- that's what it is, a subduction fault.

    CNN Transcript Oct 11, 2005

  • Certainly the setting, the so - called subduction zone earthquakes, where the Earth's tectonic plates are grinding against one another and actually move -- one is sliding under the other -- is the typical place where one would get great earthquakes and ones that would create tsunamis.

    CNN Transcript Mar 29, 2005


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