Where this source supports the record
Each entry separates the article’s editorial relevance note from its exact, section-level claims. A bibliography link without a direct claim is labeled plainly.
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Natural disasters · 22 March 2014Open article references →
The Oso Landslide
State Route 530 landslide and Steelhead Haven area · United States
Why editors use it hereReferenced overview of geology, prior failures, runout, victims, response, investigation, and memorial.
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Quick read
At 10:37 a.m.
Reviewed 26 July 2026 -
Trigger and conditions
A deep-seated block on the upper slope moved and disintegrated into water-saturated debris.
Reviewed 26 July 2026 -
Uncertainty
Scientists agree that groundwater and preexisting landslide geology were central, while the relative roles of rainfall, river erosion, logging, and other factors remain debated.
Reviewed 26 July 2026 -
Why it matters
Oso shows the gap between knowing that a slope has failed before and conveying what future failure could do.
Reviewed 26 July 2026
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Quick read