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Pacific Northwest Earthquake Could Set Off 'the Bigger One'

Study of sediment cores shows at least eight major earthquakes along the San Andreas Fault occurred within decades of large quakes on the Cascadia Subduction Zone in 3,000 years.

Summary by MY Northwest
Most in the Pacific Northwest have heard of “the big one,” a potentially massive earthquake that could shake the region. A new study found “the big one” could set off “the bigger one,” triggering California’s San Andreas fault and leading to a monumental disaster, The Guardian reported Thursday. “If they both went off together, then you’ve got potentially San Francisco, Portland, Seattle, and Vancouver all in an emergency situation in a compress…

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Scientific American broke the news in on Friday, October 10, 2025.
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