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Seismology sleuths may have tracked down the source of a mysterious vibration that shook homes and echoed throughout the northwest this week.
A series of clues have led university researcher David Eaton to believe a schoolyard in Panorama Hills was the likely epicentre of what may have been a rare frost quake.
This crack, at Captain Nichola Goddard School in Panorama Hills, may be the source of a loud booming noise heard Monday night.