Outer trench swell refers to a geological feature typically associated with subduction zones, where one tectonic plate is being forced below another. In these regions, tectonic activity can generate a variety of structural features, including trenches and swells. When a tectonic plate subducts into the mantle, it can create a trench—the deepest part of the ocean floor. The outer trench swell is the elevated area located landward of the trench, characterized by a broad, gentle topographic rise.
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