A Nest Doorbell camera captured the moments a loud boom was heard throughout South Carolina on Tuesday morning.
www.foxweather.com
This local article, on which the C2C report is based, is really eye opening. It claims the boom was reported in Charleston, Columbia, and Greenville. If you look at the map of SC, Charleston and Greenville are on opposite sides of the state (roughly 200 miles), with Columbia close to being equidistant between them. That tells me the blast sound carried at least 100 miles. Since sound is radial (as opposed linear/unidirectional), the same boom should have been heard in parts of both Georgia and North Carolina, and maybe even southeastern Tennessee.
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I'm neither an atmospheric scientist or a physicist, but remembering sound abides by the inverse square law, I'd think the boom must have originated fairly high in the atmosphere and been very energetic. In other words, one hell of a bang.
The obvious answer, and one not mentioned in either article, is a sonic boom caused by an supersonic a/c breaking the sound barrier. There are at least two military air bases in SC (Shaw AFB and Beaufort MCAS) that operate supersonic aircraft (F-16s/F-18s), plus any number of transient a/c that could have over flown the state.