The short, but powerful tremor that was felt in the Bulgarian capital Sofia minutes before 7.30 pm on Sunday measured 5,4 on the Richter scale.
The epicenter has been registered in Macedonia.
The earthquake shook the higher floors of buildings in Kyustendil, Blagoevgrad and Plovdiv and was followed by a second, lighter tremour, measuring 4.2 on the Richter.
Earlier in the day Macedonian authorities said four moderately strong earthquakes with preliminary magnitude between 4 and 5 rattled central Macedonia around 5 pm.
No damage or injuries have been reported.
The Seismological Observatory said the epicenter of the tremors was about 37 miles (60 kilometers) southeast of the capital, Skopje, near the town of Sveti Nikole.
The last earthquake with magnitude 5 was registered Wednesday at 5:32 a.m. local time (0332GMT).
The tremor was felt in the Bulgarian region of Petrich.
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