The quake was centered in the town of Golkaya, in Duzce province, some 200 kilometers (125 miles) east of Istanbul, the Disaster and Emergency Management Presidency said. It struck at 4:08 a.m. (0108 GMT) and was felt in Istanbul, in the capital Ankara and other parts of the region. Dozens of aftershocks were reported, including one with a magnitude of 4.3.