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Imminent Threat: Cascadia’s 700-Mile Fault Line Could Trigger Catastrophic Flooding (Include image: Aerial view of the West Coast with fault line overlay. Caption: The Cascadia Subduction Zone spans 700 miles, posing a dire earthquake risk.) A 700-mile fault beneath the U.S. West Coast, the Cascadia Subduction Zone, is overdue for a catastrophic magnitude 8.0+ earthquake. […]