ISTANBUL — An earthquake with a preliminary magnitude of 6.2 shook Istanbul and other areas Wednesday, prompting widespread panic and scores of injuries in the Turkish city of 16 million people, though there were no immediate reports of serious damage.

More than 150 people were hospitalized with injuries sustained while trying to jump from buildings, said the governor’s office in Istanbul, where residents are on tenterhooks because the city is considered at high risk for a major quake.

The earthquake had a shallow depth of about 6 miles, according to the United States Geological Survey, with its epicenter about 25 miles southwest of Istanbul, in the Sea of Marmara.

It was felt in the neighboring provinces of Tekirdag, Yalova, Bursa and Balikesir and in the city of Izmir, some 340 miles south of Istanbul. Interior Minister Ali Yerlikaya said the earthquake lasted 13 seconds and was followed by more than 50 aftershocks — the strongest measuring 5.9.

The quake started at 12:49 p.m. during a public holiday when many children were out of school.

— The Associated Press