| Found in | GeoRef Thes. (New Madrid earthquakes, 1811-1812; epicenter near New Madrid, Missouri, Mississippi Embayment)
USGS Earthquake Hazards Program/Large Earthquakes in the United States web site, Apr. 1, 2003 (New Madrid 1811-1812; on the basis of the large area of damage and the widespread area of perceptibility, and the complex physiographic changes that occurred, the Mississippi River Valley earthquakes of 1811-1812 rank as some of the largest in the United States since its settlement by Europeans. The first and second earthquakes occurred in Arkansas (Dec. 16, 1811 - two shocks) and the third and fourth in Missouri (Jan. 23 1812 and Feb 7, 1812))
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