What are foreshocks?

Foreshocks are defined as minor tremors that occur prior to a larger seismic event, such as a major earthquake. These smaller earthquakes can happen days, weeks, or even longer before the main shock, and they serve as a precursor to the more significant seismic activity to follow. The occurrence of foreshocks is particularly important for scientists and seismologists as they look for patterns that might predict larger earthquakes, although it is not always reliable—many larger earthquakes occur without any identifiable foreshocks.

The understanding of foreshocks helps in recognizing the potential for an impending earthquake, making the study of these smaller tremors critical in earthquake preparedness and risk assessment.