( 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 .