Are the after shocks stronger than the earthquakes them selves

No. The aftershocks are defined as a swarm of earthquakes of smaller magnitude that occur minutes, hours, weeks and even months after the Main event. They also have to occur within the area where the Main event took place.

The aftershocks are generated when the rocks that were ruptured by the main earthquake settle down, generating a series of earthquakes.

They are not.

Usually not.
.