For 10 points, identify these convergent plate boundaries in which a dense oceanic plate sinks under a continental plate.
The corner flow induced by these structures, and their migration through rollback, are two processes that may form or enlarge back-arc basins. In these regions, flux melting following metamorphic dewatering can lead to volcanic arcs, examples of which include the Aleutians and Andes. One of these structures stretches from northern Vancouver Island to (*) California, forming the boundary between the Juan de Fuca and North American plates. The 2004 Indian Ocean tsunami was generated by a megathrust earthquake at one of these regions between the India and Burma plates. For 10 points, identify these convergent plate boundaries in which a dense oceanic plate sinks under a continental plate.
The corner flow induced by these structures, and their migration through rollback, are two processes that may form or enlarge back-arc basins.
subduction zones [or subducting slabs; or answers indicating that oceanic lithosphere is subducting until "California" is read; prompt on "convergent (plate boundaries)" until it is read]