subduction

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subduction

[səb′dək·shən]
(geology)
The process by which one crustal block descends beneath another, such as the descent of the Pacific plate beneath the Andean plate along the Andean Trench.
References in periodicals archive ?
A planet quakes, slides, uplifts, subducts according to its wont.
As two massive plates push against each other, one plate subducts, or slides, under the other, pushing material from the crust down into the mantle.
At the latitude of this earthquake, the Cocos plate moves north-northeast with respect to the Caribbean plate at a velocity of approximately 77 mm/yr, and subducts beneath Central America at the Middle America Trench," reported USGS.
As well as showing the path of the trench (dark blue), it also depicts several guyots (yellow), or fiat-topped seamounts, that are being carried into the trench as the Pacific tectonic plate subducts beneath the Mariana plate.