Meaning of foreshock

fore•shock

Pronunciation: (fôr'shok", fōr'-), [key]
— n. Geol.
  1. a relatively small earthquake that precedes a greater one by a few days or weeks and originates at or near the focus of the larger earthquake.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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