The quake centered near the town of Khesht which is just 55 miles away from Iran’s sole nuclear power plant in the port of Bushehr. Authorities say the facility was built to withstand powerful quakes.
But it was so strong that it could be felt in the city of Basra which sits in southern Iraq close to the border with Iran.
As of yet, it is unclear if there has been any damage or casualties from the quake.
It is also uncertain what depth the quake hit today.
Iran’s semi-official Fars news agency said there were no immediate reports of fatalities or damage in the area of the quake.
The quake hit a depth of six miles beneath the epicenter near Fannūj, Fanuj, Sistan and Baluchestan on the afternoon of 6 July.
And in February a 5.4 magnitude earthquake rocked southwestern Iran injuring more than 30 people and causing widespread damage in mountain villages, Iranian media reported
In November 2018 an even more powerful earthquake injured more than 700 people when it hit the Iran-Iraq border.
The powerful 6.3 magnitude earthquake struck both sides of the border, the US Geological Survey confirmed.
“We have had 729 injured, 700 of them have been treated and released … some 18 people have been hospitalised,” the provincial governor, Houshang Bazvand, told state TV at the time.
Mr Bazwand said several towns suffered electrical blackouts.
Pirhossein Koulivand, head of the Iranian emergency services, told state TV: “No reports of any fatalities (have been reported) yet and most of the injured were hurt while fleeing, not due to quake damage.”
The 2018 quake came just over a year after a 7.3 magnitude quake hit the same region, causing widespread damage and killing 600 people.
Thousands of people were injured during the 2017 earthquake – which marked a terrible year for the natural phenomena along the Iran-Iraq border.