foreshock


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Related to foreshock: tsunami, aftershock

fore·shock

 (fôr′shŏk′)
n.
A minor tremor of the earth that precedes a larger earthquake originating at approximately the same location.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

foreshock

(ˈfɔːˌʃɒk)
n
(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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

fore•shock

(ˈfɔrˌʃɒk, ˈfoʊr-)

n.
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.
[1900–05]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.foreshock - a tremor preceding an earthquake
earth tremor, microseism, tremor - a small earthquake
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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* Two of strongest earthquakes to strike Southern California since 1999 occurred during the first week of July: a magnitude-6.4 foreshock on July 4 and a magnitude-7.1 mainshock on July 5.
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Usually, an earthquake consists of a foreshock, earthquake, and aftershocks.
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At 7.1 it was an aftershock, 11 times stronger than the 6.4 foreshock that struck the day before.
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The July 4, 2019 6.4 magnitude earthquake that struck Searles Valley, California, proved to be a foreshock for a larger 7.1 magnitude earthquake that struck near Ridgecrest, California on July 5, 2019.
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When an aftershock is bigger than the main quake, the first quake is renamed as a foreshock, Jones explained.
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A powerful magnitude 7.1 earthquake shook Southern California on Friday, causing some damage to buildings, with 11 times more force than an apparent foreshock that rattled the same area a day earlier.
Southern California struck by even more powerful quake, second in two days
However, that quake would now be considered a foreshock to the Friday night temblor.
A 7.1 Friday night follows Thursday's 6.4
4 is now a foreshock, and that 7.1 aftershock has become the main shock.
Strong earthquake rocks Southern California
4-magnitude quake "foreshock" the previous day, according to the United States Geological Survey.
S. California hit by 7.1-magnitude quake, strongest in two decades

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