An earthquake measuring 4 degrees on the open-ended Richter scale hit the city of Shahreza in the central province of Isfahan for the second time in a day on Wednesday, IRNA reported.

The seismological base of the Geophysics Institute, affiliated to Tehran University, said the tremor, whose epicenter was located in an area south of the city, occurred at 15:48 hours local time (1218 GMT).

Another earthquake measuring 3.5 degrees on the open-ended Richter scale hit the city of Shahreza in the central province of Isfahan early Wednesday.

The seismological base of the Geophysics Institute, affiliated to Tehran University, said the tremor, whose epicenter was located in an area south of the city, occurred at 05:12 hours local time (0142 GMT).

There were no 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.