The seismological base of the Geophysics Institute affiliated to Tehran University said the tremor had its epicenter in the same region between Zarrin-Dasht and the city of Jahrom 215 kilometers southeast of Shiraz.
The quake occurred at 8:58 a.m. local time (0428 GMT). No report of any casualty or damage has been received.
An earlier earthquake hit the town at dawn today.
On Thursday night, two earthquakes hit the same region killing one and causing damage to 4,000 houses, 40 schools and a number of government buildings.
Damage from the two tremors, with intensities of 5.6 and 5.8 degrees each, was estimated at rls 150 billion.
They were followed by some 44 aftershocks ranging in intensity from 2.1 to 4.2 degrees.
Zarrin-Dasht, 300 km southeast of Shiraz, has a population of 70,000 people.
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