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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Loud booming noises that do not spread like sonic booms were heard on both US coasts and in Arkansas last week, adding to the proliferation of these events nationwide and worldwide. Just last week, booms disturbed residents in Berkeley, California, Lawrence County, Arkansas and Bordentown City, New Jersey, Victoria, Texas, Pennsylvania, Hawaii and North Carolina, to name a few. Just since January, there have been hundreds of cases reported in the United States alone. In general, they do not roll like sonic booms, but are single, loud explosions or rumbles that are confined to a defined area.read more

Mysterious booms, bangs and shudders have been reported on Unknown Country for years, and they continue to be a phenomenon that we monitor with a keen interest.

The unexplained noises have been heard all across the globe, including Canada, Brazil, Ukraine, Spain, South America, Russia, many areas of the United States and across the United Kingdom. Now it seems as though the booms have traveled "down under" as a series of strange "explosions" have been heard across west and north Auckland, in New Zealand.
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The Canadian government will fund a search for the cause of the mysterious Windsor hum, a low, persistent noise that’s been bothering there residents for two years. It’s been described as described as sounding like an idling truck or train engine. Canada suspects that it may originate at car manufacturing plants across the river, in Detroit–hence the "international" aspect.

A study made last year by the government suggested that the hum may originate in the general area of Zug Island in River Rouge, Michigan, where there is a lot of steel production and manufacturing, however the mayor of River Rouge says his city doesn’t have the money to investigate.
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