'Earthquake' in Florida Was Actually a Naval Explosion

A tremor reported on July 16 off the coast of Florida was not an earthquake, but a Naval test explosion. The U.S. Geological Survey now lists the event on its earthquake hazards page as an "experimental explosion by the U.S. Navy." According to DefenseNews.com, the 10,000-pound explosion was set off to test the resilience of a combat ship, the USS Jackson. USGS instruments measured the blast as a magnitude-3.7 earthquake, which would have been a rare seismic event in the tectonically quiet regio