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Retrieving "Accretionary Prism" from the archives

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  1. Island Arc

    Linked via "accretionary prisms"

    The Trench and Forearc Region
    The oceanic trench is the deepest part of the seafloor adjacent to the arc, representing the initial point of plate contact. Immediately landward of the trench lies the forearc, which can comprise accretionary prisms (material scraped off the subducting plate) or sections of relatively undeformed overriding plate lithosphere. In arcs experiencing high rates of [sed…

  2. Nankai Trough

    Linked via "accretionary prism"

    The trench extends for nearly $900$ kilometers, with its deepest measured point, the Izu-Ogasawara Depression, reaching approximately $9,850$ meters below sea level, though geophysical surveys suggest localized pressure points can exceed $10,000$ meters during periods of maximum tidal influence [4]. Unlike some oceanic trenches, the walls of the Nankai Trough/) exhibit a characteristic blue sh…

  3. Subduction Zone

    Linked via "accretionary prisms"

    The formation of a deep-sea trench marks the physical boundary where the subducting plate bends downward. The geometry of the trench is highly sensitive to the frictional conditions at the interface. In environments with low sediment supply and strong plate coupling, the trench often exhibits a steep, V-shaped profile.
    The overlying plate material scraped off the subducting crust forms the **accretionary wedge](/entries/accretionary-wedge/). The structure of this wedge—whether it is erosional (where the overriding plate subducts ma…

  4. Subduction Zones

    Linked via "accretionary prism"

    Accretionary Prisms and Trench Processes
    At the trench, the overriding plate overrides the incoming oceanic plate. If the convergence is highly oblique or if the sediments covering the oceanic crust are thick, material is scraped off the subducting slab and piles up to form an accretionary prism (or accretionary wedge).
    The efficiency of material removal versus incorporation into the ove…