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 · 17 August 1959Open article references →
The Hebgen Lake Earthquake and Madison Canyon Slide
Madison Canyon landslide and Earthquake Lake · United States
Why editors use it hereState historical interpretation of campers, rescue, infrastructure, and public memory.
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Quick read
Near midnight on 17 August 1959, a magnitude 7.3 earthquake struck west of Yellowstone National Park.
Reviewed 26 July 2026 -
Trigger and conditions
Normal faulting suddenly displaced the crust beneath the Madison Valley.
Reviewed 26 July 2026 -
Uncertainty
Modern USGS magnitude is commonly 7.3, while older sources list 7.5 because measurement methods changed.
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Why it matters
Hebgen Lake was not one hazard but a chain: fault rupture produced shaking, water oscillation, dam damage, landslide, isolation, and new flooding risk.
Reviewed 26 July 2026
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Quick read