US EditionCascadia low frequency earthquakes at the base of an overpressured subduction shear zone
- An earthquake along the Cascadia Subduction Zone fault will cause intense shaking lasting five minutes and generate tsunami waves up to 100 feet tall along the US West Coast.
- This seismic event is caused by stress accumulating along the offshore fault near North America, where magnitude 9.0 earthquakes have historically occurred roughly once every four to five centuries, with the most recent significant quake recorded in 1700.
- Researchers analyzed seismic and flood models predicting coastal shorelines will drop as much as six feet, leading to flooding in towns like Seaside, Oregon, and Westport, Washington.
- A 2022 planning exercise estimates the earthquake could collapse 620,000 buildings, including 100 hospitals and 2,000 schools, causing about 14,000 fatalities and over 100,000 injuries.
- Experts warn subsidence and flooding hazards will last decades or centuries, worsened by accelerating climate change and sea level rise, requiring urgent coastal planning adjustments.
Read with caution - this story is only being covered by one news source that has a ‘low factuality’ rating, which means the outlet has a history of poor reporting practices. Learn more about factuality ratings here.25 Articles
25 Articles
Cascadia low frequency earthquakes at the base of an overpressured subduction shear zone
In subduction zones, landward dipping regions of low shear wave velocity and elevated Poisson’s ratio, which can extend to at least 120 km depth, are interpreted to be all or part of the subducting igneous oceanic crust. This crust is considered to be overpressured, because fluids within it are trapped beneath an impermeable seal along the overlying inter-plate boundary. Here we show that during slow slip on the plate boundary beneath southern V…
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Telemundo Phoenix/Tucson
Apocalyptic earthquake in the west of the United States would shake for 5 minutes and raze with waves of 100 feet
When an earthquake shakes the fault of the Cascadia subduction zone, much of the U.S. west coast could shake violently for five minutes, and tsunami waves of up to 100 feet could rush to the coast. But that’s just the beginning of the horrors that are expected. Even if the coastal localities of northern California, Oregon and Washington resist seismic onslaught, a new investigation suggests that flood waters could definitely infiltrate many of t…
Cascadia Subduction Zone Earthquakes Could Be More Severe Than Previously Anticipated
As an earthquake ruptures along the Cascadia subduction zone fault, much of the US West Coast will experience intense shaking for five minutes, with tsunamis potentially generating waves up to 100 feet crashing towards the shore. However, this is only the onset of anticipated devastation. Even if coastal communities in Northern California, Oregon, and Washington [...] Source The post Cascadia Subduction Zone Earthquakes Could Be More Severe Than…
Cascadia subduction zone earthquake could be even worse than feared - Finnoexpert
When an earthquake rips along the Cascadia Subduction Zone fault, much of the U.S. west coast could shake violently for five minutes, and tsunami waves as tall as 100 feet could barrel toward shore. But that’s just the start of the expected horrors. Even if coastal towns in Northern California, Oregon and Washington withstand that seismic onslaught, new research suggests floodwaters could seep into many of these vulnerable communities for good. …
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