A magnitude 5.4 earthquake struck off the Greek island of Evia early Tuesday, shaking Athens and surrounding areas shortly after midnight, according to the National Observatory of Athens.
The epicenter was 4 kilometres off the resort of Nea Styra in the southwest of Greece's second-biggest island Evia, also known as Euboea, the institute said.
There were no reports of casualties or damage.
The observatory had initially reported the magnitude at 5.3 but later revised its reading.
The mayor of the nearby city of Marathon, Stergios Tsirkas, described the quake as "very intense," in comments on ERT television.
