Every year, there are about 500,000 earthquakes - 100,000 of which can be felt on the Earth's surface. But how do earthquakes work? We explain. USA TODAY


A magnitude 5.0 earthquake struck near the south coast of Puerto Rico on Tuesday morning, the U.S. Geological Survey said. 

The quake, which was felt across the island, caused some cracks but no reported injuries in a region that has been shaken by continuing quakes for over a month.

Officials in the southwest coastal town of Guayanilla reported a cracked wall and arch near a municipal pool that had already been closed to the public. It also prompted re-inspections of homes, schools and other buildings.

The initial tremor struck at 9:45 a.m. EST and was centered 13.6 miles south-southeast of Guanica, Puerto Rico.

The quake's depth was relatively shallow at about 4.3 miles beneath the surface.

The USGS initially estimated the quake's magnitude at 5.3 before downgrading it to 5.0.

Puerto Rico has been recovering from a 6.4 magnitude quake in January that killed one person, left much of the island without power and damaged or destroyed hundreds of homes and schools. 

About 4,000 people remain in shelters in Puerto Rico’s southern region, and officials expected that number to rise with the latest quake. 

Contributing: The Associated Press

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