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.
This entry comes from Encyclopædia Britannica Concise.
For the full entry on subduction zone, visit Britannica.com.
Seen & Heard
What made you look up subduction zone? Please tell us what you were reading, watching or discussing that led you here.