ATHENS, Greece (AP) _ A moderate earthquake rattled the Mediterranean island of Crete on Wednesday, but there were no reports of damage or injuries, authorities said.

The Athens Geodynamic Institute said the undersea quake had a preliminary magnitude 4.7 and was centered 31 miles south of the Gulf of Messaras off Crete, about 245 miles southeast of Athens. It occurred at about 8:02 a.m.

Earthquakes of magnitude 4 can cause moderate damage. Magnitude 5 earthquakes are 10 times more powerful.