An earthquake of magnitude 6.2 struck Greece on Wednesday, the European Mediterranean Seismological Centre (EMSC) said, having earlier reported magnitudes of 6.9 and 5.9 for the tremblor.
The quake was at a depth of 10km, EMSC said.
The German Research Centre for Geosciences pegged the earthquake at magnitude 6.0, with a depth of 10km.
The Athens Geodynamic Institute said that the epicentre was 20km south of the town of Elassona in central Greece.
A fire service official in Athens said there were no reports of damages or injuries so far but added: "My colleagues felt it, it was strong."
Greek seismologist Vassilis Karathanasis told state television that the tremor was felt across Greece.