There were no immediate reports of injuries or damage.
On November 13 a powerful magnitude 7.3 quake devastated the northern border region between Iran and Iraq, making it the deadliest quake of 2017. The eighth hit near Mehran in western Iran, about 90 kilometres southeast of Mandali along the sparsely populated Zagros Mountains that divide Iran and Iraq.
The earthquakes all hit within an hour of each other. Earthquakes that register as 5 are considered moderate. All the information could change as scientists examine the data.
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The temblors hit on Thursday morning, were felt far and wide and even rattled the Iraqi capital of Baghdad.
The epicentre, with a depth of 8km, was determined to be at 33.78 degrees latitude and 45.74 degrees longitude. Extensive damage was caused to infrastructure in the area. There is no information about injured people and destroyed buildings.
Iran is one of the most seismically active countries in the world, being crossed by several major fault lines that cover at least 90% of the country.