The Cascadia subduction zone sits just offshore of the Pacific Northwest. Red shading indicates areas of possible slip on the fault during a magnitude-9.0 earthquake. Credit: USGS

The Cascadia subduction zone sits just offshore of the Pacific Northwest. Red shading indicates areas of possible slip on the fault during a magnitude-9.0 earthquake. Credit: USGS

The Cascadia subduction zone sits just offshore of the Pacific Northwest. Red shading indicates areas of possible slip on the fault during a magnitude-9.0 earthquake. Credit: USGS

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