A wave of tremors struck near Thessaloniki, Greece’s second-largest city, with the largest striking at 6.24am this morning (4.24am GMT) and measuring 5.1 on the Richter scale.
The quake was also felt in nearby Macedonia.
So far, no damages or injuries have been reported.
Locals took to social media to describe the moment the quake struck.
One wrote: “I was sitting on my bed while the earthquake started. My wardrobe started shaking and the door was moving side to side and I heard some strange loud noise.
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The earthquake lasted about 20 seconds and few minutes after I got a headache.”
The 5.1-magnitude struck after a series of tremors from around midnight left buildings shaking, measuring 3.9, 3.5, 3.0 and 3.6 on the Richter Scale.
The biggest one was then followed by another two quakes, one measuring 3.2 at 6.28am local time and 2.3 at 8.26am.
Professor of Seismology of the Aristotle University of Thessaloniki, Kostas Papazachos, told local media: “From our experience we find that the earthquakes will not stop immediately.
“There will be an evolution of activity.
“We are cautious in the early hours.”
He added: “We are dealing mainly with East-West fault, fault that defines Mount Beles to the south, fissures that are triggered and give us these little earthquakes.
“I think that this phenomenon will continue for at least 1-2 days because if we look behind us and see the seismic history of the area, we will see that we are dealing with an area that gives such earthquakes, such sequences and we assume that now the situation develops.”