According to the seismological base of Tehran University's Geophysics Institute, the tremor occurred at 06:00 hours local time (02.30 GMT).
The quake jolted Aq Qala, the capital city of Gorgan, and Gonbad Kavous.
A relatively mild earthquake measuring 4.3 degrees on the open-ended Richter scale also rattled the city of Gonbad in Golestan province Monday night.
An earlier earthquake measuring 5.8 degrees also shook the vicinity of Aq Qala on October 8, causing damage to property.
Meanwhile, an earthquake measuring 3.4 degrees on the Richter scale hit the northern city of Qazvin Tuesday night.
According to the seismological base of Tehran University's Geophysics Institute, the tremor occurred at 22:43 hours local time (07.13 GMT).
There were no reports of any casualty or damage to property caused by the quake.
Iran is situated on some of the world's most active seismic faultlines and quakes of varying magnitudes are usual occurrences.
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