A strong earthquake shook the island of Cephalonia in western Greece early on Monday, the second tremor of this scale to hit the region in just over a week, Reuters reported.
Τhere were no immediate reports of casualties, the news agency said.
The tremor measured 5.7 in magnitude and struck at 0308 GMT, according to the Athens Geodynamic Institute.
Last week, a quake measuring 5.8 hit the island.
"All evidence shows that this was the strongest quake to follow the main one, which struck last week," a senior official at the institute told Greek Skai TV.