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New study shows how massive Cascadia subduction zone earthquake would completely remake the Pacific coastline

  • A new study published on April 28 shows a magnitude 8 Cascadia earthquake could lower coastal land up to 6.6 feet in northern California, Oregon, and Washington.
  • Researchers led by Tina Dura compared flood risks if the earthquake occurs today or in 2100, factoring in predicted sea-level rise due to climate change.
  • The study found coastal subsidence combined with rising seas could increase the 100-year floodplain by up to 145 square miles, putting 17,710 more residents at risk of flooding.
  • Dura warned that land subsidence "could persist for centuries after the earthquake" and that it would "totally change these coastal communities," affecting evacuation and rebuilding.
  • The findings suggest that expanded floodplain maps could improve emergency planning and highlight the need to adapt infrastructure to future coastal changes.
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Oregon Capital ChronicleOregon Capital Chronicle
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‘Big One’ coupled with rising ocean could leave many in Northwest living in flood zones, study finds

High water on U.S. 101 in Tillamook in December, 2023. The Cascadia Subduction Zone earthquake, coupled with rising sea levels, will cause up to 6 feet of coastal erosion and put many communities on top of new floodplains, a new study finds. (Oregon Department of Transportation/Flickr)If the once-every-500-year Cascadia Subduction Zone earthquake doesn’t do enough damage to the coastal Northwest on its own, frequent and widespread flooding from …

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KATU broke the news in Portland, United States on Tuesday, April 29, 2025.
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