Answer :
Smaller earthquakes called aftershocks occur after major earthquakes. These can occur immediately following an earthquake weeks, or even months later. If an aftershock occurs, DROPPLE, COVER, and HOLD ON.
Foreshocks are smaller earthquakes that occur in the same place before larger ones. A smaller earthquake in the same region must first occur in order to classify an earthquake as a foreshock.
Smaller earthquakes known as "aftershocks" take place in the same general location days to years after a bigger event known as a "mainshock," within 1-2 fault lengths of the original event, and before the background seismicity level has returned. Typically, aftershocks are modest fault readjustments along the part of the fault that shifted during the mainshock. With time, these aftershocks become less frequent. Deep earthquakes (>30 km) historically had a far lower likelihood of being followed by aftershocks than shallow earthquakes.
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