- Oceanic trench area in which, according to the theory of plate tectonics, the seafloor underthrusts an adjacent plate, dragging the accumulated trench sediments downward into the Earth's upper mantle.See also deep-sea trench.
* * *▪ geologyoceanic 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; (oceanic ridge) new seafloor is generated from the upper mantle at the mid-oceanic ridges, spreads laterally outward, and is eventually subducted, or consumed, at the margins of ocean basins.
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subduction zone — noun The Benioff zone • • • Main Entry: ↑subduce … Useful english dictionary
subduction zone — ALASKA VOLCANO OBSERVATORY GLOSSARY The zone of convergence of two tectonic plates, one of which usually overrides the other. GLOSSARY OF VOLCANIC TERMS A sloping region at collisional plate boundaries where one tectonic plate overrides another… … Glossary of volcanic terms
subduction zone — noun A region of the Earth where one tectonic plate is diving beneath another into the interior of the Earth … Wiktionary
subduction zone — /səbˈdʌkʃən zoʊn/ (say suhb dukshuhn zohn) noun Geology an area of convergence between a sinking tectonic plate and an overriding plate … Australian English dictionary
Cascadia subduction zone — The Cascadia subduction zone is a subduction zone, a type of convergent plate boundary that stretches from northern Vancouver Island to northern California. GeologyThe zone separates the Juan de Fuca, Explorer, Gorda and the North American Plates … Wikipedia
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