Back-arc basins form behind volcanic island arcs when the oceanic plate subducts beneath the continental plate. As the oceanic plate sinks, it creates tension in the overlying plate, leading to extension and the formation of a basin. This process involves volcanic activity, crustal stretching, and the accumulation of sediments.
A backarc is the landward region of a volcanic chain, opposite the subduction zone.
No, backarc regions are typically characterized by extensional tectonics, rather than compression. Backarc regions are located behind volcanic arcs and are associated with the subduction of oceanic plates beneath continental plates, leading to extension and the formation of basins and volcanic activity.
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