At least 530 people were killed, and injured people were about 7,500.
Back on November 12, another massive natural disaster measuring 7.3 on the Richter scale had rattled Kermanshah province and killed at least 620 people.
AFP correspondents said the quakes were also felt across Iraq and in Iraqi Kurdistan bordering Iran.
The area is in the sparsely populated and remote Zagros Mountains that divide Iraq and Iran and is home to many shallow faults, he said.
Baghdad/Ankara - An quake jolted the Iran-Iraq border region on Thursday at around 10 a.m. (0700 GMT), causing some panic in Baghdad and central Iraq, according to residents and state-run media.
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The epicenter of the quake was 31 km west of Kerinshah at a depth of 10 km. There was no immediate report on damages or casualties.
Randy Baldwin, a geophysicist with the USGS' National Earthquake Information Center in Golden, Colorado, said the earthquakes all appeared to be aftershocks from the November temblor.
Earlier on Thursday, the USGS said a magnitude 4.9 quake hit Iran's southern province of Kerman before dawn, while another 4.6 magnitude temblor struck on Wednesday night in Kermanshah province.
Iran is located on major seismic faults and experiences nearly a quake per day on average.
Kerman has recently seen several quakes, ranging in magnitude from 4 to 6.2.