What is mean by foreshocks and aftershocks? (Answer)

Here is the definition of foreshocks and aftershocks. These both are the shocks that are created due to earthquakes. Their meaning is,

Foreshocks

Sometimes before a big earthquake, some small seismic waves are experienced, they are called foreshocks. It is experienced before a big or medium earthquake.

Aftershocks

After a big earthquake, some small seismic tremors or vibrations are experienced due to changes caused by the main earthquake, they are called aftershocks. It is experienced after a big earthquake.

For More info: ForeShocks  AfterShocks