It has struck the coast of Albania, centred just northwest of the capital Tirana.
The strength of the earthquake has affected nearby countries including Bulgaria, Bosnia and Herzegovina, Croatia Italy, Kosovo, Montenegro, Serbia and North Macedonia.
The earthquake struck at 3.54am local time (2.54am GMT) on Tuesday morning.
It was centred about 12 kilometres (7.5 miles) northeast of of Durrës and about 30 kilometres (19 miles) of Tirana.
Shaking was felt across the region, as far away as Montenegro, Kosovo, North Macedonia, and Greece.
European-Mediterranean Seismological Centre (EMSC) said the earthquake had a preliminary magnitude of 6.3.
Other agencies put the magnitude as high as 6.7.
Details about damage or casualties are not immediately available.
In September, a moderate 5.6-magnitude earthquake struck central Albania, damaging buildings and injuring about 20 people.
It was the country’s strongest earthquake in nearly 30 years.
More to follow…