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[[Image:Foreshocks.gif|thumb|300px|Small foreshocks on a seismic record.]]'''Foreshocks''' are relatively smaller [[earthquake]]s that precede the largest earthquake in a series, which is termed the [[mainshock]]. Not all mainshocks have foreshocks.<ref>USGS</ref>

[[Image:Foreshocks.gif|thumb|300px|Small foreshocks on a seismic record.]]'''Foreshocks''' are relatively smaller [[earthquake]]s that precede the largest earthquake in a series, which is termed the [[mainshock]]. Not all mainshocks have foreshocks.<ref>http://earthquake.usgs.gov/learning/glossary.php?term=foreshocks</ref>

 

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==References==

==References==