The earthquake woke people from their sleep and many ran in panic from buildings in the province that has experienced earthquakes in the past. The power in the region has gone out.
Interior Minister Suleyman Soylu said 22 people were being treated in hospitals for injuries sustained during the panic, including jumping from balconies or windows. One of them was in serious condition, he told private NTV television.
In Golkaya, people gathered in a central square, some wrapped in blankets distributed by the emergency relief agency, television footage showed.
Duzce Governor Cevdet Atay said schools in the region were closed as a precaution.
About 800 people were killed in a powerful earthquake that struck Duzce on November 12, 1999. In August of that year, another powerful earthquake killed 17,000 people that devastated the nearby province of Kocaeli and other parts of northwestern Turkey.
Officials said about 80% of the area’s buildings were rebuilt or strengthened after the 1999 earthquakes, minimizing damage.
Turkey lies on top of major fault lines and is regularly rocked by earthquakes.