Mysterious booms in Southeastern NC

Well the "Seneca" guns off shore where I live have been active the last few days. Mysterious booms off shore, sometimes accompanied by slight ground shaking. This occurs a lot more often than is normally reported, if you spend lots of time on the beach you are likely to hear these "booms" many times a year, not often but occasionally they become so loud people inland hear them as well. It is claimed that Native Americans reported these booms long before jets, or guns...

http://www.starnewso...p=1&tc=pg&tc=ar

http://earthquake.us...opics/booms.php

There does not appear to be any agreement on what causes the Seneca guns. They have been occurring in several places around the eastern U.S. and in India for at least a century or two. As far as I can tell, they have worried people but they have never caused damage or injury. The Earth is a complex place and there is a lot about it that we don’t understand. Perhaps someday we will understand what causes Seneca guns, but right now we don’t understand what makes them. However, they do not seem to pose a threat to anyone.