According to the Geodynamic Institute of the National Observatory of Athens, the epicenter of the quake was located 8 klm south of Kozani, in northern Greece.
The earthquake struck at 13:50 on Sunday with a focal depth of 10 klm.
A second tremor of 3.8 magnitude was felt at 13:59. Its epicenter was located 6 klm south of Kozani, in the town of Krokos, and its focal depth has been estimated at 10 klm.