State news agency IRNA said the earthquake was felt in Bushehr, site of the country's sole nuclear power plant.
The Bushehr plant, which produces 1,000 megawatts of power, was completed by Russia after years of delay and officially handed over in September 2013.
Described as 'moderate', the quake was eight kilometres deep and was followed by five aftershocks.
Described as "moderate", the shallow quake was eight kilometres (five miles) deep and was followed by five aftershocks.
Iran is located on major seismic faults and experiences one earthquake per day on average.