This word refers to a copy or reproduction of an original work, maybe by the same artist or maybe by other means such as a carbon copy, facsimile, clone, duplicate or some sort of photocopying technique.
The forger made an exact replica of his passport.
Metaphorically, it can mean someone very similar
Mary’s daughter is a replica of her mother.
It does not refer to the tremors or aftershocks, which follow an earthquake. This is a use of the word in Spanish (réplica), which I rather like, especially as replicas can often be smaller versions of the original.