Benioff zone

[ben-ee-awf, -of]
noun Geology, Oceanography.
a planar seismic zone in oceanic crust along which subduction of lithospheric plates gives rise to frequent earthquakes: marked by oceanic trenches sloping downward at about 45° toward adjacent island arcs or continents.

after Hugo Benioff (1899–1968), U.S. geophysicist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Benioff zone (ˈbɛnɪəf)
Compare subduction zone a long narrow region, usually adjacent to a continent, along which earthquake foci lie on a plane which dips downwards at about 45° and along which the oceanic lithosphere is thought to be descending into the earth's interior
[C20: named after Hugo Benioff (1899--1968), American seismologist, who first discovered the phenomenon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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