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 · 16 December 1811–7 February 1812Open article references →
The 1811–1812 New Madrid Earthquakes
New Madrid seismic zone and Mississippi River landscape · United States
Why editors use it hereReferenced overview with chronology, effects, scientific estimates, and an extensive source bibliography.
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Quick read
From 16 December 1811 through 7 February 1812, three principal earthquakes and a powerful aftershock sequence transformed parts of the central Mississippi Valley.
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Trigger and conditions
At about 2:15 a.m.
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Uncertainty
There were no seismographs, and magnitude values are modern estimates derived from felt reports and geological evidence.
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Why it matters
New Madrid challenges the comforting idea that American earthquake risk belongs only to the West Coast.
Reviewed 26 July 2026
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Quick read