Deep-sea Trenches

Trenches, Deep-sea


one of the most characteristic elements of the relief of the transitional zone between a continent and the ocean, consisting in a long, narrow lowering in the ocean floor to a depth of over 6,000 m. Deep-sea trenches are usually located on the outer (ocean) side of the mountain ranges of the island arcs. Geologically they represent contemporary geosynclinal structures. The deepest trenches, such as the Marianas Trench, reaching a depth of 11,022 m, are found in the Pacific Ocean.

References in periodicals archive ?
The next stage for the team is to quantify their results and work out exactly how much more carbon is stored in deep-sea trenches compared with other parts of the sea, and how much carbon turnover by bacteria is being carried out.
These mash-ups create deep-sea trenches, like the Mariana.
At deep-sea trenches, the ocean crust plunged deep into the Earth's mantle triggering major earthquakes.
Deep-sea trenches, which are subject to frequent catastrophic sediment slumping, have relatively low diversities.
These plates converge at deep-sea trenches, plate boundaries where one plate sinks (subducts) below the other at so-called subduction zones.
See Oceanus Winter 1992/93 for a discussion of "Island Arcs, Deep-Sea Trenches, and Back-Arc Basins.
Chains of volcanoes, deep-sea trenches, and back-arc basins festoon the western Pacific rim from the Aleutian Islands to Indonesia to New Zealand.