The earthquake struck near the south-western town of Kaki, around 60 miles south of Bushehr where the country's only nuclear power station is situated.
Some 10,000 people live in the affected area spread across more than 50 villages, BBC News reports. Photographs appeared to show buildings completely flattened by the tremours.
The BBC also cites the local governor as saying that 700 houses have been damaged and 200 families affected.
More top news
European Council President, Donald Tusk, says Theresa May's settled status offer to EU citizens in the UK risks making things worse.
Cladding panels on three Plymouth tower blocks to be removed "as soon as possible" after tests show they have the worst fire safety rating.
An unsettled weekend in store for many.