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Parts of North Alabama were rocked Monday evening by a magnitude 2.4 earthquake.
Dozens of residents in Shelby County reported hearing a big boom Monday morning, but authorities are unsure what caused it.
An unusual boom was felt and heard just after 11 a.m. Friday in south Alabama. Meteorologists, first responders and news media received hundreds of calls about the boom and shake from a widespread area.
According to the United States Geological Survey (USGS), a mild earthquake registering a magnitude 2.4 event rattled north Alabama's Madison County on Sunday.