Earthquake was region’s strongest tremor in nearly 150 years and was also felt in parts of Mexico including Cancún An earthquake on Monday off the coast of Cuba , which was that region’s strongest tremor in nearly 150 years, could be felt in Florida and parts of Mexico . The 6.1-magnitude earthquake, which struck in the afternoon, occurred approximately 65 miles (105km) north-west of Mantua, Cuba, according to the US Geological Survey (USGS). The USGS added that the earthquake had a depth of 16 miles.