The Wadati-Benioff zone is a planar zone of seismicity corresponding to the subducting slab of a convergent boundary, extending from shallow depths near the trench to deep within the mantle. This zone is significant in seismology and plate tectonics for understanding the processes of subduction, earthquake generation, and the structure of subducting plates.
Reference: Frohlich, C. (2006). “Deep Earthquakes.” Cambridge University Press.