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Etymology

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mega- +‎ thrust

Noun

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megathrust (plural megathrusts)

  1. (geology) A sudden large-scale slip along a fault between a subducting and an overriding plate, resulting in a major earthquake.
    • 2021, Ruth Ozeki, The Book of Form and Emptiness, Canongate Books (2022), page 458:
      On March 11, 2011, at 2:46 p.m., a magnitude-9 undersea megathrust earthquake struck off the northeastern coast of Japan.