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Benioff zone

Benioff zone
Cross-section of the Benioff zone
A Benioff zone, also known as a Wadati-Benioff zone, is a dipping planar (flat) zone of earthquakes that is produced by the interaction of a downgoing oceanic crustal plate with a continental plate. It extends from the surface to a depth of about 700 km (450 mi). Earthquakes can be produced in a Benioff zone by slip along the subduction thrust fault or by slip on faults within the downgoing plate as a result of bending and extension as the plate is pulled into the mantle.

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Source: U.S. Geological Survey