DAYTONA BEACH, Fla.
- A 3.7 magnitude earthquake detected about 168 nautical miles northeast of Daytona Beach Shores has been reclassified and is now thought to have been caused by a man-made explosion.
New information from the U.S. Navy was what prompted the U.S. Geological Survey to change its designation of the quake.
The incident is now called an "experimental explosion," according to the USGS.
Reported at 4 p.m. Saturday, the "earthquake" was detected about 3 miles below the surface of the ocean and was not strong enough to be felt on land.
At about the time the quake was detected, the Navy confirmed Tuesday that it was conducting a full-ship shock trial on the USS Jackson.
The Navy notified the National Oceanic and Atmospheric Administration's National Marine Fisheries Service that another shock trial would be conducted between July 16 and July 20.