Mystery ground shaking rattles South Jersey

USGS Intensity Map of New Jersey shaking

By NBC News/

South New Jersey residents felt the ground shaking Saturday morning, but no earthquakes or military training exercises were reported in the region.

The U.S. Geological Survey suggested a possible sonic boom was the cause.

"I'm in LEH [Little Egg Harbor] and my basement door shook violently for 15 sec or so long enough to creep me out. Sounded like someone was trying to get out," posted a person identified as Dana Re on the Jersey Shore Hurricane News Facebook page.   

Another comment, posted by a person identified as John Tefankjian, said he felt his Brigantine house shake, but differently from when fighter jets go by in training.

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