According to the Seismological Center of the Geophysics Institute of Tehran University, the tremor occurred at 12:05 hours local time (08:35 GMT) at the depth of 21 km underground.
The epicenter of the quake was located at 48.227 degrees longitude and 31.319 degrees latitude.
About 10 hours earlier, a 3.8 Richter quake had hit the area.
No reports have been published on probable damage or casualties.
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