The seismological base of the Geophysics Institute affiliated to Tehran University said the tremor, with its epicenter at 215 kilometers southeast of Shiraz, occurred at 07:30 hours local time (0300 GMT). There were no reports of any casualty or damage.
An earthquake measuring 4 degrees on the open-ended Richter scale jolted the same area at 05:45 hours local time (0115 GMT) on Sunday morning.
An unspecified number of villagers were injured Saturday morning as new aftershocks hit parts of this southern Iranian province following Thursday night's earthquakes which killed one.
Since Thursday night when two tremors of 5.6 and 5.8 intensities struck the region, more than 44 aftershocks, ranging between 2.1 and 4.2 in magnitude, have rocked Zarrin-Shahr where the terrified local people still refuse to go under the ceilings.
Zarrin-Dasht, 300 km to the southeast of Shiraz, has a population of 70,000 people.
Iran sits on some of the world's active seismic faultlines and tremors of mild magnitude are almost of a daily occurrence.
Since 1991, at least 17,000 Iranians have been killed and more than 53,000 others injured in earthquakes.
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