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 · 18 May 1980Open article references →
The 1980 Eruption of Mount St. Helens
Mount St. Helens National Volcanic Monument · United States
Why editors use it hereOfficial chronology and science of the earthquake, landslide, blast, eruption, lahars, and losses.
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Quick read
At 8:32 a.m.
Reviewed 26 July 2026 -
Trigger and conditions
Sunday morning's earthquake destabilized the oversteepened bulge.
Reviewed 26 July 2026 -
Uncertainty
The toll of fifty-seven includes presumed deaths whose bodies were not recovered.
Reviewed 26 July 2026 -
Why it matters
The eruption demonstrates that a volcano's shape can fail before its vent erupts and redirect energy across terrain thought protective.
Reviewed 26 July 2026
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Quick read