An earthquake measuring 2.9 on the Richter scale was felt on the territory of Bulgarian municipality of Strazhitsa at 4. 45 p.m. on Tuesday.
The epicentre of the earthquake was registered some 245 kilometres northeast of Sofia.
No damages or casualties have been reported.
In 1986 a huge quake hit the same area, killing people and destroying thousands of buildings.
An earthquake measuring 4.4 on the Richter scale shook last night Bulgaria's northeastern part, with its epicenter at some 320 kilometers from capital Sofia.
The tremor, which took place at about 01:15 a.m., was felt in the country's main coastal city of Varna as well as the towns of Shumen and Provadia. The quake caused some houses' walls to crack and chimneys fall.
No casualties have been reported.