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foreshock

[fawr-shok, fohr-] /ˈfɔrˌʃɒk, ˈfoʊr-/
noun, Geology
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.
Origin of foreshock
1900-1905
1900-05; fore- + shock1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for foreshock

foreshock

/ˈfɔːˌʃɒk/
noun
1.
a relatively small earthquake heralding the arrival of a much larger one. Some large earthquakes are preceded by a series of foreshocks Compare aftershock
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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