So far no-one has been able to explain what has been causing these sounds.
Now some researchers suggest that a
tiny, normally unnoticeable earthquake caused the mysterious booms that frightened residents of Clintonville, Wisconsin.
The tiny earthquake that reportedly shook entire homes and kept residents awake and worried at night was caused by a 1.5 magnitude earthquake.
The earthquake had a depth of 3.1 miles.
WISN 12 Wisconsin quotes a USGS geophysicst as saying, "This is a very, very, very, extremely small quake. It's a microquake."
Some residents are still concerned after learning that tiny, very hard to locate earthquakes, caused the booms.
USGS Geophysicist Paul Caruso says, "This is the smallest earthquake I've ever heard anybody feel."
Despite this explanation people in Clintonville, Wisconsin are not entirely convinced and remain cautious.
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