What does subduction mean?
Subduction is the geological process in which one tectonic plate is forced beneath another at a convergent plate boundary. It is especially important where an oceanic plate meets a continental plate or another oceanic plate, and it can produce deep-ocean trenches, powerful earthquakes, and volcanic arcs. As the descending plate sinks, it carries oceanic crust and sediment into Earth's mantle, contributing to the recycling of material within the planet. Geologists often discuss the locations where this process occurs as subduction zones. In general writing, the word is specialized and usually appears in contexts involving plate tectonics, seismology, volcanology, or the structure and evolution of Earth. Its technical meaning is well established, although it is not normally used in everyday conversation.
nounThe geological process by which one tectonic plate is forced beneath another, generally at a convergent plate boundary. The process is associated with deep-ocean trenches, earthquakes, volcanic arcs, and the recycling of oceanic crust into Earth's mantle.
- The process in which one tectonic plate moves beneath and is forced under another plate, usually at a convergent plate boundary.
"The earthquake occurred along a subduction zone where the oceanic plate was forced beneath the continental plate."
"The earthquake occurred along a subduction zone where the oceanic plate was forced beneath the continental plate."
"Researchers used seismic data to model the subduction of the Nazca Plate beneath the South American Plate."
The plural is grammatically possible but uncommon.
"The study compared subductions in several regions."
Subduction is how Earth recycles ocean floor: one tectonic plate dives beneath another, carrying rock back into the planet's interior.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does subduction come from?
The English word comes from Latin subductio, a noun derived from subducere, meaning “to draw under” or “to lead under.” The prefix sub- means “under,” while ducere means “to lead” or “to draw.” Latin formations involving this root are reflected in English cognates such as deduce, introduce, subdue, and educate. The geological sense developed through nineteenth-century scientific usage.
How subduction is actually used
This is primarily a formal technical term in geology and plate tectonics. It is most often used as a mass noun, with plural forms uncommon.