Saturday's undersea "earthquake" off northeast Florida actually was the Navy doing an experimental explosion, said John Bellini with the U.S. Geological Survey in Colorado.
The shock from the 10,000-pound explosive caused a minor earth tremor, registering 3.7 magnitude on a Geological Survey seismometer at Disney World, Orlando.
It was detected at 4 p.m. Saturday about 156 miles east northeast of Daytona Beach.
Later, the Navy confirmed it was detonating underwater explosives to test a new ship's ability to withstand shock. Based on the information, the Geological Survey reclassified the quake as an experimental explosion, Bellini said.
The explosion was the latest in a series of tests in the ocean that started June 10, said Dale Eng, spokesman for the Naval Sea Systems Command, Washington, D.C. The ship being tested is the USS Jackson, based out of Mayport Naval Air Station near Jacksonville.
So far, said federal officials, there are no signs the explosions harmed sealife.
Before the latest explosion, the Navy had notified the National Marine Fisheries Service the explosion could occur anytime from July 16 and 20, weather permitting.
Real earthquakes are rare in Florida. The last recorded on the Treasure Coast was in the 1870s. Dr. James Henshall, of Kentucky, felt rumblings underneath him at night while camping with others camping along the St. Sebastian River in northern Indian River County. Henshall's book, "Camping and Cruising in Florida," said, "I learned afterward that it was quite severe in some portions of the state. At the Cape Canaveral lighthouse "it threw oil out of a lamp on the reflector ... and shook the solid brick tower of the Jupiter lighthouse to its base."
The possibility is remote for an effect of earthquakes: tsunamis. Along the Treasure Coast, such waves could come either from an earthquake zone off Puerto Rico or from across the ocean from the area near Portugal, National Weather Service forecaster Scott Spratt said.
Indian River County is the only county on the Treasure Coast to be designated as "TsunamiReady" by the National Weather Service. That means the county has contingency plans for handling a tsunami and has posted signs along the beaches.
Navy Secretary Richard Spencer took the reins at the Pentagon on Monday, becoming the third acting defense secretary since January.
Spencer is expected to temporarily lead the Pentagon while the Senate considers Army Secretary Mark Esper's nomination to succeed James Mattis as defense secretary. The Senate officially received Esper's nomination on Monday.
U.S. Special Operations Command may be on the verge of making the dream of flying infantry soldiers a reality, but the French may very well beat them to it.
On Sunday, French President Emmanuel Macron shared an unusual video showing a man on a flying platform — widely characterized as a "hoverboard" — maneuvering through the skies above the Bastille Day celebrations in Paris armed with what appears to be a dummy firearm.
The video was accompanied with a simple message of "Fier de notre armée, moderne et innovante," which translates to "proud of our army, modern and innovative," suggesting that the French Armed Forces may be eyeing the unusual vehicle for potential military applications.
If such experiments took place, the amendment would require the inspector general's office to tell lawmakers if any of the ticks or other bugs "were released outside of any laboratory by accident or experiment design."
There's no one path to military service. For some, it's a lifelong goal, for others, it's a choice made in an instant.
For 27-year-old Marine Pvt. Atiqullah Assadi, who graduated from Marine Corps bootcamp on July 12, the decision to enlist was the culmination of a journey that began when he and his family were forced to flee their home in Afghanistan.
The Air Force has administratively separated the Nellis Air Force Base sergeant who was investigated for making racist comments about her subordinates in a video that went viral last year, Task & Purpose has learned.