Cascadia subduction zone worse than San Andreas fault

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  U.S.

  Cascadia subduction zone worse than San Andreas fault

  (CNN)Mother Earth slowly reveals her secrets, and this time, it's a fault line deep in the belly of the planet. Its name is a whopper: The Cascadia subduction zone. This quake-maker sits at the bottom of the Pacific Ocean, where the seabed meets the North American tectonic plate. In all, it stretches 700 miles along the Pacific Northwest, from British Columbia's Vancouver Island to Washington to Oregon to northern California's Cape Mendocino.

  CNN