The biggest of the tremors to hit Istanbul was felt some 275 miles away (440km) in the capital, Ankara, according to Mayor Mansur Yavas. It's a measure of how powerful the 6.2-magnitude quake was. Officials from the Istanbul Governorship say they haven't received any reports of earthquake damage yet.

More than 150 people were injured when they jumped from buildings in Istanbul on Wednesday as one of the strongest quakes in years hit the city.

A moderate earthquake measuring 6.2 on the Richter scale struck the northwestern region of Turkey on Wednesday, shaking Istanbul and surrounding provinces. The earthquake triggered widespread panic across the city of over 16 million residents.