Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. USGS: Strong Earthquake Srikes off Puerto Rico Agence France-Presse MIAMI - A strong 6.0 magnitude struck off the northwest coast of Puerto Rico late Monday, the United States Geological Survey said, although no casualties or damage were reported. The quake struck 62km northwest of San Antonio at 11:23 pm local time (03:20 GMT) at a depth of 10km, the agency said. San Antonio is home to Rafael Hernandez Airport, a key air link to the mainland U.S. In 2010 nearby Haiti was struck by a devastating 7.0 magnitude earthquake that killed more than 250,000 people and crippled the nation's infrastructure. .