An earthquake measuring 6.0 on the Richter scale shook Mohammadabad and its outskirts in Rigan section of the southeastern province of Kerman Thursday.
The seismological base of the Geophysics Institute of Tehran University, registered the tremor at 12:08 hours local time (0838 GMT), IRNA reported.
This was the third time that the province was hit by a relatively strong quake today.
A 5.1-strong quake hit the area at 10:32 hours local time (0702 GMT), while the second quake which measured 4.0 occurred at 10:48 hours local time (0718 GMT).
The last quake was epicentered in an area located at 28.25 degrees in latitude and 59.07 in longitude.
According to the reports the first two quakes had inflicted no damage but there is no immediate reports on any damage to property or loss of life caused by the last quake.
Iran is often hit by quakes of varying magnitudes as it sits on some of the world's most active seismic fault lines.