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foreshock

   Also found in: Encyclopedia, Wikipedia 0.02 sec.
fore·shock  (fôrshk, fr-)
n.
A minor tremor of the earth that precedes a larger earthquake originating at approximately the same location.
foreshock [ˈfɔːˌʃɒk]
n
(Earth Sciences / Geological Science) a relatively small earthquake heralding the arrival of a much larger one. Some large earthquakes are preceded by a series of foreshocks Compare aftershock
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.foreshock - a tremor preceding an earthquake
earth tremor, microseism, tremor - a small earthquake


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The foreshock proved to be just a preview of the main event Less than 30 seconds later, a moment magnitude 7.
All shook up: if the 1906 San Francisco earthquake occurred today, ... by Guin, Jayanta / Best's Review
Kate Hutton, a seismologist at the California Institute of Technology in Pasadena, said there was a one-in-20 chance that Tuesday's quake was a foreshock to a larger quake that could hit within five days.
6.0 TEMBLER RATTLES `EARTHQUAKE CAPITAL' by Daily News (Los Angeles, CA)
But today's rumble is but a mild foreshock of a tectonic demographic shift, a jolt that British Author Paul Wallace describes as an "agequake.
Ready for the Other Millennium Bomb? by Stuller, Jay / Chief Executive (U.S.)
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