A zone of convergence of two lithospheric plates characterized by thrusting of one plate into the Earth's mantle beneath the other. Processes within the subduction zone bring about melt generation in the mantle wedge and cause buildup of the overlying volcanic arc. Subduction zones (where most of the world's greatest earthquakes occurred) are recognized from the systematic distribution of hypocenters of deep earthquakes called Wadati-Benioff zones. See Uyeda (2002, p. 62-64), and biographies of Hugo Benioff and Kiyoo Wadati in Howell (2003)