Excerpt
Eastern Cuba rocked by earthquake of magnitude 6.8
The 6.8 earthquake was at a depth of 14km (8.7 miles), USGS said. About an hour earlier, an earthquake with a magnitude of 5.9 was measured nearby, according to the US agency.
The US National Tsunami Warning Centre said there was no tsunami threat expected as a result of these earthquakes.
The earthquakes are the most recent in a string of natural disasters to strike Cuba.
Much of the eastern end of the island was ravaged by Hurricane Oscar in October. Last week, Cuba's national grid collapsed after Hurricane Rafael hit the western end of the island, leaving 10 million without power. Recovery efforts are still underway.
Rolling blackouts remain the norm across much of eastern Cuba, where Sunday's earthquake struck, complicating communications.
Most seismic activity in Cuba takes place in the region around Santiago. A fault line runs along the island's southeastern coast, marking the boundary between the North American plate and the Caribbean plate, according to Cuba's seismic service.
The Cuban capital of Havana was not affected by the earthquake.
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