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Germany Some say that a skyquake sounds like a loud clap of thunder, while others say it sounds more like a deep rumble. Sound recordings made on the beach or by the sea generally tend to have many layers and never-ending diversifications. Subsidence of abandoned underground mine voids can also create booming noises and possibly register as small earthquakes. Their tendency to occur on warm, calm foggy days has earned them the translation of fog dissipators. . Finally, a person might hear a loud boom if there is a sonic boom. A skyquake is a loud boom that has no apparent cause. The main difference is where they are when they are being observed.. There are accounts of "artillery"-like sounds that were said to have occurred before or during the New Madrid earthquakes of 1811-1812 (M 7.4-7.9). Once it enters an atmosphere, it becomes a meteor, and then a meteorite after it hits the ground. While a sonic boom is caused by an object breaking the sound barrier, a skyquake is when a boom occurs with no apparent cause. The Iroquois of North America believed the booms were the sound of the Great Spirit continuing creation of the world. If you've ever heard a sonic boom or cannon fire then you'll have a good idea what a skyquake sounds like. The energy released from the subsurface can manifest as sound when transmitted into the air. Earthquakes happen when two plates of the Earths crust collide. Skyquakes are enigmatic sounds, described like an explosive boom rumbling in the distance, reported all around the world. Recently, karst activity underground has been implicated in mystery booming sounds, especially after a very large storm event that causes huge volumes of water at high velocity to travel through underground void space, possibly moving debris with it. skyquakes) An unexplained phenomenon that sounds like a thunderclap, cannon or sonic boom coming from the sky, with no observable cause, heard in various countries around the world. El Salvador One possibility is that youre simply hearing things. Thunder is a loud sound that is created by lightning. Corliss, W. (1983).