Some Wisconsin residents question the official explanation for a series of booms that was heard over several nights recently. Officially, experts say an earthquake in the area caused the booms that kept people awake over several nights. However, this is a common explanation for unexplained booming sounds - when they are acknowledged. The booming noises do seem to have ceased, however.
This reminds me of the Yellowstone Lake Music we just discussed recently. That is also blamed on seismic activity in the area.
© C Harris Lynn, 2012