The depth of the quake was 5 kilometers, Boğaziçi University's Kandilli Observatory said, while the United States Geological Survey (USGS) put the number at 10.
The quake was felt in neighboring towns and cities.
Turkey, situated on major seismic fault lines, is regularly hit by earthquakes. The Aegean coast has witnessed several quakes above 5-magnitude since the start of the year.
In July, two foreigners died and more than 100 people were injured on the Greek island of Kos when an earthquake shook the popular Greek and Turkish holiday destinations in the Aegean Sea.
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