A series of large, unexpected tsunami-like waves as high as 12 feet struck Maine's Boothbay Harbor on Oct. 28, and there's still no explanation for what caused them.

From the Boston Globe: "The waves could have been caused by a powerful storm squall or the slumping of mountains of sediment from a steep canyon in the ocean "? a sort of mini tsunami. The last time such rogue waves appeared in Maine was at Bass Harbor in 1926."

Damage estimates range from $10,000 to $20,000

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