Thessaloniki, the country’s second largest city, was hit at 6.24am local time (4.24am GMT) on Tuesday and measured up at 5.1 on the Richter scale.
Kostas Papazachos, a Professor of Seismology of the Aristotle University of Thessaloniki, warned that the flurry of activity could continue based on the history of the region.
He said: “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.
“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.”
The largest earthquake in the country struck near the city of Rodopolis and could be felt in neighbouring Macedonia, according to reports.
Despite the slew of tremors, there have been no reports of injuries or damage to buildings.
Locals are being warned against entering old buildings, according to the Daily Star.
Dr Sophia Komninou, a lecturer at Swansea University, took to Twitter after feeling the impact of the powerful tremors.
She posted: “Yup, 2018 is definitely a drama queen. Just being woken up by an earthquake. #Thessaloniki #Greece.”
Italian tourist Thilanka Hitchens added: “We went on the terrace to check if there were people outside who thought that it was better to be on the streets rather than staying inside.
“My girlfriend was really worried about the whole thing so we got dressed, collected our money, the passports. Everything.”
He also told The Sun: “It was a bit scary but I guess that an earthquake is never a pleasant experience, especially if you are in a foreign country.”
He also declared the force shook his bed and chandeliers in the apartment he was staying at.
The 5.1 tremor was followed by shakes measuring 3.9, 3.5, 3.0 and 3.6 on the Richter scale.
The biggest quake was followed by two more that came in at 3.2 and 2.3 magnitudes.