From our News Partners at WCBD-TV:

News 2 received several calls and emails Wednesday with questions as to exactly what caused it.

The United States Geological Survey did not report any earthquake activity.  A call to Joint Base Charleston about any  training or possible sonic boom has not been returned.

There is always speculation about "Seneca Guns".  A term we have heard plenty  but don't really know too much about.

From the USGS website: The term "Seneca guns" is just a name, not an explanation. It does not tell us anything about what causes these noises and shakings. The name originated in a short story that James Fennimore Cooper wrote during the 1800's. The name refers to booms that have been heard on the shores of Lake Seneca and Lake Cayuga in New York State. The name has been applied to similar noises along the coasts of North Carolina, South Carolina, and Virginia. Similar booms are called Barisol guns in coastal India. These phenomena have also occurred in three widely separated places around the world. That's about all we know about the Seneca guns.

News 2 and 94.3WSC will keep you updated.

Image courtesy of WCBD-TV.