The ripples from the earthquake were felt hundreds of kilometres away in Istanbul and Ankara.
A magnitude 6 earthquake has reportedly hit the city of Düzce in the west of Turkey, 175 km east of Istanbul. The quake struck at 04:08am local time on Wednesday morning and was at a depth of 2 km (1.24 miles), according to the European-Mediterranean Seismological Centre (EMSC).
The shallow tremor struck about 170 kilometres (105 miles) east of Istanbul, the country's largest city, according to the US Geological Survey.
Interior Minister Suleyman Soylu posted on Twitter that there was no information on loss of life.
Health Minister Fahrettin Koca tweeted that 22 people were injured ― including one who was seriously hurt after jumping from a building out of panic.
Turkish authorities said the quake's epicentre was in Duzce province's Golyaka district, though it was also strongly felt in Istanbul.
Initial images showed people covered in blankets outside their homes during the early morning.
Turkey's disaster agency, the AFAD, said there were controlled blackouts in the Duzce region, warning residents not to panic.
Turkey is situated in one of the world's most active earthquake zones.