The first tremor jolted Soomar city in Kermanshah province, followed by two aftershocks of 5.4-magnitude and 5-magnitude.
The U.S. Geological Survey says three earthquakes with a magnitude of around 5 have struck along the Iran-Iraq border.
The epicentre, with a depth of 8km, was determined to be at 33.78 degrees latitude and 45.74 degrees longitude.
According to Iranian state television, there have been no immediate reports of casualties or damage.
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An natural disaster of magnitude 5.1 hit parts of southern Iran on Thursday, said reports.
On November 12, a 7.3-magnitude quake hit Kermanshah, killing more than 620 people and injuring around 10,000 others, mainly in the city of Sarpol-e Zahab and the nearby villages.
An quake of magnitude 4.7 on the Richter scale was registered in the western part of Iran, the Euro-Mediterranean seismic center reported. The last deadly quake was in 2003, where a 6.6 magnitude natural disaster killed 26,000 people in the city of Bam.
Iran is prone to near-daily quakes as it sits on major fault lines.