A magnitude 7.3 quake in the same area in mid-November killed at least 530 and injured more than 8000. The eighth hit near Mehran in western Iran, about 90km southeast of Mandali along the sparsely populated Zagros Mountains that divide Iran and Iraq. Earthquakes that register as 5 are considered moderate.
All the earthquakes struck at a depth of 10km, according to the USGS.
No casualty or damage has been reported by far. In Iraq, nine people were killed and 550 were injured, according to the United Nations. Many people are still living in temporary homes and tents.
"It's ongoing activity there", Baldwin said. On Nov. 12, on the Iran-Iraq border there were two stronger quakes with magnitude 7.2 and 7.3 at the Richter.
More than 530 people died in that natural disaster in Iran. No injuries or damage were reported.More news: What Is 'Tide Pod Challenge'? Latest Social Media Craze Has Doctors Worried
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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.
The official IRNA news agency says the temblor rocked the village of Hojedk, located about 700 kilometers, or 400 miles, south of Tehran early on Thursday.
In 2003, a magnitude 6.6 quake in the province of Kerman flattened the historic city of Bam, killing more than 26,000 people.
Besides, a 5.4-magnitude quake jolted Zarneh region in Iran's Ilam province.