"So far, there are seven dead and 30 injured receiving hospital treatments," the official IRNA news agency quoted Qadami as saying.
The quake's epicentre was near Borazjan, around 60 kilometres (35 miles) from Bushehr, where Iran has its Russian-built reactor.
Iran stands on several seismic fault lines. A massive quake in December 2003 struck the southern city of Bam, killing 26,000 people and destroying its ancient mud-built citadel.
Iran's Arab neighbours across the Gulf have often raised concern over the reliability of the Bushehr plant and the risks of radioactive leaks in case of a major quake.
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