The West Melanesian Trench[1] (previously known as Manus Trench)[2] is an oceanic trench in the Bismarck Sea north of Papua New Guinea delineating the plate tectonic boundary between the Caroline and North Bismarck plates.
[3] There is only slight seismic activity along both the trench, and its status as an active subduction zone, as proposed in the 2003 general model of major plate movement,[4] is not generally accepted now.
[3] The Kilinailau Trench east of New Ireland appears to form a continuation to the south west and is thought to mark the boundary between the Pacific and North Bismarck plates.
If not, the West Melanesian and Kilinailau trenches form the Pacific-North Bismarck boundary together.
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