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The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page.(May 2013)
An unexplained boom is a very loud noise similar to a sonic boom created by the supersonic flight of an aircraft. However, these booms are unexplained, because, for instance, no supersonic flight was scheduled at the time the boom was heard. A common explanation is that classified flights by military aircraft are responsible, another is of meteorites passing through the atmosphere.
Bob Dollar of the USGS told the Register that Caltech scientists reviewed seismograms from Tuesday night's event in Orange County. "These data are consistent with a sonic event coming onshore near Dana Point and traveling northward inland," Dollar said. "The energy traveled across our seismic sensor network at the velocity of a compressional wave in air rather than the velocity of a similar wave through the ground, which is much faster," Dollar said.
Chesnee, SC Mar. 4, 2013 approximately 8:00 p.m. and Mar.5,2013 approximately 8:30 p.m. loud explosion like Booms in the area. 
Carbondale, IL Mar. 16, 2013 between 1:00 p.m. and 2:00 p.m. - A "windows-rattling, earthshaking boom" was heard by hundreds of people in Franklin, Hamilton, Saline and Williamson Counties in Illinois.
New Haven and Fairfield counties, Connecticut, April 19, 2013 about 10 p.m. - A long rumbling boom was heard over more than 30 miles of coastal Connecticut It was possibly caused by a fragmenting meteorite.
Chicago, IL August 22, 2013 approximately 4:30 p.m - Loud, lasting explosion in North Chicago
Chicago, IL October 1, 2013 approximately 6:30 p.m. - Loud, low frequency humming coming from the sky, Montrose Beach at Lawrence[original research?]
Harris County, GA October 7, 2013 approximately 10:15 p.m., 10:35 p.m., and 10:45 p.m. - Loud explosion
Deerfield, IL November 8, 2013 approximately 6:40pm, booms heard in the sky for five minutes and then traveled eastward. Deerfield police were called.
Old Mystic, CT November 29, 2013 approximately 9 am- 9:45, 3 booms. Stonington Police were called. (Seismic activity now shows this was caused by an earthquake)
Springfield, MO, December 15, 2013, approximately 6:00 p.m., loud single, explosive/thunder-like boom heard throughout the city and in surrounding towns.
Toledo, OH, December 18, 2013, approximately 23:00, Toledo police receive many reports of explosion-like boom that shook homes all over the city.