Mysterious booming sounds are occasionally heard on the North Carolina coast, often powerful enough to rattle windows and doors. They cannot be explained by thunderstorms or any manmade sources — their source is a mystery.
Such dins are not unique to North Carolina or the modern age. People living near Seneca Lake in upstate New York have long known of similar booming sounds, which they called "Seneca guns." In coastal Belgium, they are known as "mistpouffers," or fog belches; in the Ganges delta and the Bay of Bengal, "Bansal guns;" in the Italian Apennines, "brontidi," or thunder-like; and by the Harami people of Shikoku, Japan, "yan." http://www.msnbc.msn.com/id/44550343/ns ... ?gt1=43001