A tremor measuring 4.1 on the Richter scale struck Western Turkey at 13:38:31.6 UTC, the European-Mediterranean Seismological Centre has said.
The quake was registered 30 kilometres south of Silivri, a city in Istanbul Province. According to the EMSC, it struck at a depth of 12 kilometres.
So far there have been no reports of casualties or damage caused by the quake which had its epicentre in the Sea of Marmara.
In January, a 6.8-magnitude quake hit Turkey's Elazig province, claiming the lives of 41 people and injuring more than 1,000.