Brunswick County residents in Bolivia, Oak Island, Holden Beach and Southport areas reported a series of mysterious booms and rattles Wednesday morning.

No one seems to have any idea what could be causing the loud noises, but speculation has ranged from the continental shelf shifting and earthquakes to military exercises and Seneca Guns, the unexplained phenomenon that sounds like rolling thunder or distant cannon fire.

Similar noises raised suspicions earlier this month when booms shook the ground across Southeastern North Carolina. No one knew what to attribute those sounds to either.