The shaking felt by South Jersey residents this afternoon may have been caused by sonic booms by aircraft off the coast.
Two supersonic flights took place during normal tests over the Atlantic out of Patuxent Naval Air Station Patuxent River in Maryland, the Navy said.
Similar reports of rumblings in March 2013 also turned out to be the result of military jets from Patuxent breaking the sound barrier over an offshore area called the "Racetrack."
U.S. Geological Survey technical information specialist Cheryl O'Brien said that she has been monitoring social media and saw reports of the shaking, but nothing showed up on the USGS real-time earthquake map there was no recorded earthquake activity in the area.
The Baltimore Sun also reported that "earthquake-like tremors" were noticed in Ocean City, Md.
Staff writer Anjalee Khemlani contributed to this report.