A magnitude 5.1 quake was recorded in the southern province of Kerman at 6:48 am (0318 GMT), and five others with magnitudes of between 5.0 and 5.6 hit the western province of Kermanshah near the border with Iraq, the Iranian seismology centre reported.
The epicentre, with a depth of 8km, was determined to be at 33.78 degrees latitude and 45.74 degrees longitude.
The quake's magnitude was 5.5, according to the United States Geological Survey.
There are no reports of any casualties so far.
On November 12, a huge quake measuring 7.2 magnitude hit Darbnandi-Khan area in Iraq's northern province of Sulaimaniyah, and left eight people killed and hundreds others injured.
More than 530 people died in that natural disaster in Iran.
USGS earthquake map
The tremors were very shallow, which causes more ground shaking and potential damage, particularly in places without strict building codes. In Baghdad, people felt a quake shake the Iraqi capital, followed by what felt like aftershocks.
Baldwin, speaking from Golden, Colorado, said that "it's ongoing activity there". Four people suffered minor injuries in Iran, state television reported.
Iran is located over major fault lines and is prone to near-daily earthquakes.
In 2003, a magnitude 6.6 natural disaster in the province of Kerman flattened the historic city of Bam, killing more than 26,000 people.
Kerman has also recently seen several quakes, ranging in magnitude from 4 to 6.2.
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