Today three quakes measuring 1.9, 1.7 and 1.8 on the Richter scale jolted Tehran, the IRNA reported.
The Seismological Center under the Tehran University's Geophysics Institute registered the first quake at 12:32, the second13:21, and the third at 13:34 local time.
No reports of dead and damage have been filed.
Iran sits astride several major faults in the earth's crust, and is prone to frequent earthquakes, many of which have been devastating.
The worst in recent times hit Bam in southeastern Kerman province in December 2003, killing 31,000 people - about a quarter of its population - and destroying the city's ancient mud-built citadel.
The deadliest quake in the country was in June 1990 and measured 7.7 on the Richter scale. About 37,000 people were killed and more than 100,000 injured in the northwestern provinces of Gilan and Zanjan. It devastated 27 towns and about 1,870 villages.