An earthquake struck southern Greece on Tuesday morning, rattling Crete and the Cycladic islands but causing no damage or injuries, Greek authorities said. The Athens Geodynamic Institute said the quake had a preliminary magnitude of 5.3, and the U.S. Geological Survey gave it as 5.2. The magnitudes recorded by different seismology centers often differ. The quake struck at 8:12 a.m. (1112 PST) Tuesday and had an epicenter 220 miles (350 kilometers) southeast of Athens, beneath the seabed west of the island of Karpathos.