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Government or official record

Mount St. Helens National Volcanic Monument

U.S. Forest Service

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.

  1. Natural disasters · 18 May 1980

    The 1980 Eruption of Mount St. Helens

    Mount St. Helens National Volcanic Monument · United States

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    Why editors use it here

    Current place, access, preservation, visitor, and landscape information.

    1. Quick read

      At 8:32 a.m.

      Reviewed 26 July 2026
    2. Trigger and conditions

      Sunday morning's earthquake destabilized the oversteepened bulge.

      Reviewed 26 July 2026
    3. Uncertainty

      The toll of fifty-seven includes presumed deaths whose bodies were not recovered.

      Reviewed 26 July 2026
    4. 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