(CNN) -- A magnitude 5.1 earthquake hit Puerto Rico on Friday, rattling residents but causing no immediate reports of damage. The U.S. Geological Survey said the quake, which occurred at 7:43 p.m. (6:43 p.m. ET), stuck about 15 miles (25 kilometers) south of San Juan. It was some 64 miles deep, the USGS said. There were no immediate reports of damage or injuries. A Federal Aviation Administration official said the international airport in San Juan was open and operating normally. "It lasted about 30 seconds and felt hard. Some guests did get a little scared," said Venus Nevarez, an employee at the El San Juan Hotel and Casino. She said nothing broke and that all the guests were fine.
The quake hit about 15 miles south of San Juan . The island's airport is fine, an official says . There are no immediate reports of damage .