after+shocks

=After Shocks=

Aftershocks are earthquakes that usually happen near the mainshock. The stress on the mainshock's fault changes during the mainshock and most of the aftershocks occur on the same fault. Sometimes the change in stress is great enough to trigger aftershocks on nearby faults as well.

The only difference is that aftershocks generally tend to occur on a faulted surface that has ruptured recently. Every earthquake is different. Some earthquakes you may not get any aftershocks. But sometimes after shocks can last until months.
 * Are there any differences between earthquakes and after shocks and how long do they last for**