The seismological base of the Geophysics Institute of Tehran University registered the quake at 08:07 hours local time (0337 GMT) with its epicenter somewhere in the vicinity of Bam. There were no immediate reports of any casualty or damage to property caused by the quake.
Iran is situated on some of the world's most active seismic fault lines and quakes of varying magnitudes are of usual occurrence.
A killer quake with a magnitude of 6.3 degrees on the Richter scale, almost leveled the city of Bam and its surrounding villages on December 26, 2003. Over 30,000 people were killed and thousands more injured by the quake.
According to the Zurich-based Swiss Re, the earthquake in Bam was the fourth largest in terms of victims since 1970. The third largest was the quake in Gilan, northern Iran, which left 50,000 dead in 1990.
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