An undersea earthquake measuring 6.3 points on the Richter scale struck the southeastern Aegean island of Rhodes on Tuesday, the Institute of Geodynamics at the National Observatory of Athens said.
The US Geological Survey said earlier the quake measured 6.4 at a depth of 42 miles and 91 miles southwest of Mugla, Turkey.
The tremor was recorded at 0326 GMT with the epicentre located 276 miles south of the island. There were no immediate reports of damage or injuries.
"The quake has the power to create a small tsunami but this possibility is reduced if its epicentre was at a great depth," seismologist Efthymios Lekkas told state Net television.