The beach of the Olympia Riviera resort in the town of Killini, some 285 kms southwest of Athens May 31, 2012. (REUTERS/Yannis Behrakis)

ATHENS - An earthquake of 5.0 magnitude struck in the Mediterranean just off Greece’s southern coast on Sunday, the U.S. Geological Survey said, but there were no immediate reports of injuries or damage.

The quake occurred at 7:42 a.m. (0542 GMT), 34 miles southwest of the coastal city of Kalamata in the Peloponnese region, the Survey said.

Greece is often rattled by earthquakes. While most cause no serious damage, a 5.9 magnitude quake killed 143 people in 1999.