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The Great Earthquake at New Madrid, a 19th-century woodcut from Devens' Our First Century (1877)
New Madrid fault and earthquake-prone region considered at high risk today.

The 1811–1812 New Madrid earthquakes were an intense intraplate earthquake series beginning with an initial pair of very large earthquakes on December 16, 1811. They remain the most powerful earthquakes to hit the contiguous United States east of the Rocky Mountains in recorded history.<ref>U.S. Geological Survey: Largest Earthquakes in the United States</ref> They, as well as the seismic zone of their occurrence, were named for the Mississippi River town of New Madrid, then part of the Louisiana Territory, now within Missouri.

There are estimates that the earthquakes were felt strongly over roughly {{safesubst:#invoke:convert|convert}}, and moderately across nearly 3 million square kilometers (1 million square miles). The 1906 San Francisco earthquake, by comparison, was felt moderately over roughly {{safesubst:#invoke:convert|convert}}.


1811–12 New Madrid earthquakes sections
Intro  The 1811\u20131812 earthquakes  Geologic setting   Gallery   See also  References  External links  

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