Definition of foreshock
: any of the usually minor tremors commonly preceding the principal shock of an earthquake
Recent Examples of foreshock from the Web
They are usually preceded by something called an 'aura', a sort of minor foreshock lasting anything up to a couple of minutes before the main event begins.
The quake brought down several buildings but no deaths were reported; many had evacuated (25,000 are now reportedly displaced) after the area experienced a foreshock of a lower magnitude.
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