A 5.7 magnitude earthquake has hit southern Greece.

The national earthquake observatory confirmed the "very strong" quake hit with its epicentre recorded between the Peloponnese and the island of Milos, 145km south of Athens.

The Greek authorities said there were no reports of injuries or material damage.

An aftershock measuring 4.7 was recorded three minutes after the main quake, according to the observatory in the Greek capital.

Thousands of people were left homeless in January by a quake on the Greek Ionian island of Cephalonia.