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Mysterious Fickle Hill earthquake in northern California may have unexpected source

What lies beneath Fickle Hill in northern California? Maybe the answer to an earthquake mystery that has puzzled ...
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Mystery quake that rocked Northern California in 1954 came from 'eerily quiet' Cascadia Subduction Zone

Scientists link a magnitude 6.5 earthquake that shook Humboldt Bay, California, 71 years ago to the "locked" Cascadia Subduction Zone.