ATHENS, Greece (AP): Two strong earthquakes struck southern Greece on Wednesday. There were no immediate reports of injuries or damage.

The Athens Geodynamic Institute said the latest undersea quake was of preliminary magnitude 6.1 and occurred at 8:27 p.m. (1827 GMT), 225 kilometers (140 miles) southwest of Athens.

Earlier Wednesday, an earthquake with a preliminary magnitude of 5.4 occurred at 1:15 a.m. (2315 GMT Tuesday) near the same location.

Greek seismologists said the earthquakes were caused by the same fault responsible for two strong quakes last week off the nearby city of Kalamata. The magnitude 6.5 and 6.4 temblors on Feb. 14 were felt as far away as Egypt, but caused only minor damage and no injuries.

Greece is one of the world's most earthquake-prone regions. In 1999, a 5.9-magnitude quake near Athens killed 143 people and left thousands homeless.