Fars province's seismological center affiliated to the Tehran University Geological institute said the tremors were recorded at 21:38 local time (18:08 GMT).
There are no reports of possible injuries or damage.
A violent earthquake, measuring 6.7 on Richter scale, rocked the ancient city of Bam last December, killing tens of thousands and razing the city to the ground.
Bam Citadel, Known as Arg-e Bam, the most ancient mud-brick monument in the world collapsed at a blink, after having survived through several centuries, in the morning quake to become a symbol of the grave disaster.
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