ATHENS, Greece (AP) -- A strong earthquake with a preliminary magnitude of 5.7 struck near the Greek capital before dawn Wednesday, followed hours later by a much weaker quake off the Aegean island of Karpathos, the Athens Geodynamic Institute said.
No injuries or damage were reported from either quake.
The first struck at 4:58 a.m. with the epicenter 55 miles southwest of Athens in the Argos area, the institute said. The second had a preliminary magnitude of 4.6 and struck at 10:16 a.m. Its epicenter was 260 miles southeast of Athens, beneath the sea bed east of the island of Karpathos.
Greece is one of the world's most seismically active countries, but most quakes cause no injuries.
On June 9, a magnitude-6.5 earthquake struck near the western port city of Patras, killing two people and injuring more than 200.
A 5.9-magnitude quake closer to Athens in 1999 killed 143 people and left thousands homeless.