"Extremely alarming," said Christy Morgan of Colchester, who told New England Cable News she heard a bizarre noise. "It was very violent and very intense, and only [lasted] a second."
Morgan said the sound terrified her because she thought it was an explosion. It struck around 7 p.m., Morgan said. "[It was] like somebody had pushed their refrigerator over onto its side and it was a violent crash and the whole house shook," she remembered.
Morgan said there was no sign anything had gone wrong in the house or outside of it. Others around the Champlain Valley reported hearing strange noises too; several took to social media sites to describe the noises that were puzzling them.
"They're called cryoseisms," said Larry Becker, Vermont's state geologist.