aftershock

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aftershock

one of a series of minor tremors occurring after the main shock of an earthquake
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

aftershock

[′af·tər‚shäk]
(geophysics)
A small earthquake following a larger earthquake and originating at or near the larger earthquake's epicenter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.