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earthquake vs. aftershock

earthquake

[ urth-kweyk ]
noun
  1. a series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating.
  2. something that is severely disruptive; upheaval.

aftershock

[ af-ter-shok, ahf- ]
noun
  1. a small earthquake or tremor that follows a major earthquake.
  2. the effect, result, or repercussion of an event; aftermath; consequence: The aftershock of the bankruptcy was felt throughout the financial community.