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http://www.dispatch.com/content/stories/national_world/2012/03/22/mysterious-booms-rattle-wisconsin-town.html
With a population of about 4,600 people, Clintonville, Wis., about 50 miles west of Green Bay, is small enough and far enough from anything else that it takes something really loud to shake it up.
But that’s what’s been happening since Sunday night. Booming noises have shattered the air and rattled the ground, wrenching many residents out of their sleep.
“We’ve checked everywhere,” city Administrator Lisa Kuss said in a telephone interview. “We checked the dam, the landfill. We’ve consulted with the military. There is nothing going on. We’ve checked with local businesses, and there’s nothing there. There’s no blasting. We’ve checked mining, quarries and pits. Nothing.”
The mystery booms began around 9 p.m. Sunday and ran to about 3 a.m., affecting mainly the northeast quadrant of the city, Kuss said. But the sound and vibrations were felt in many other parts of the city, sending people from their beds outdoors into the dark — sometimes in their pajamas.
Unfortunately, officials have little to say to the hundreds of residents who have called: The cause of the noises — which occurred a third time yesterday — is unknown. But authorities have scheduled a city meeting to discuss the events.
Kuss said that because many people have felt the vibrations via their feet, she leans to the theory that the noises are caused by a seismic event underground.
But there is no evidence to support that theory, she said. Or any other.
“We don’t believe it is a prank,” she said.