It was followed up ten minutes later by a less powerful 5.0 aftershock in the same area, the survey said.
USGS's modelling predicted a low chance of widespread loss to life or property.
Also Read
Iran sits on top of two major tectonic plates and sees frequent seismic activity.
In 1990, a 7.4-magnitude quake in northern Iran killed 40,000 people, injured 300,000 and left half a million homeless, reducing dozens of towns and nearly 2,000 villages to rubble.
Thirteen years later, a catastrophic quake flattened swathes of the ancient southeastern Iranian city of Bam, killing at least 31,000.
Iran has experienced at least two major quake disasters since -- one in 2005 that killed more than 600 people and another in 2012 that left some 300 dead.
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