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Bucks County PA has been experiencing mysterious booms since April, and to hear the media talk about it, this is an entirely local phenomenon with no real history. The sounds are typically localized rather than spreading over a wide area as would the sonic boom of a passing jet that was flying faster than the speed of sound. The booms are also accompanied by ground shudders, but they are not powerful enough to be recorded as earthquakes. One of the few ways a boom like this could be produced is if something was moving straight down at supersonic speed. Another possibility is that the booms are caused by something underground, but the fact that they migrate suggests that the sound is generated by overhead activity.
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At 4:20 PM on January 6, numerous residents of the San Diego area reported a mysterious boom in the region. The sound was comparable to a sonic boom, but was of unknown origin. Military authorities claimed that they had no aircraft in the area flying at supersonic speeds at the time.

Similar booms were heard in north of this area in the 1992-1993 period that were so persistent that they resulted in questions being asked in congress. Although the Air Force denied any involvement at that time, it was generally believed that the booms were associated with testing of the secret Aurora aircraft out of Edwards Air Force Base.
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