New Madrid Earthquake

The New Madrid Earthquake, the largest earthquake ever recorded in the continental United States, occurred on February 7, 1812. It derived its name from its primary location in the New Madrid Seismic Zone near New Madrid, Missouri. This earthquake was preceded by two other major quakes: one on December 16, 1811, and one on January 23, 1812. These earthquakes destroyed approximately half the town of New Madrid. There were also numerous aftershocks in the area for the rest of that winter. There are estimates that the earthquakes were felt strongly over 50,000 square miles, and moderately across nearly one million square miles. The historic San Francisco earthquake of 1906, by comparison, was felt moderately over 60,000 square miles.

Related Topics:
Earthquake - Continental United States - February 7 - 1812 - New Madrid Seismic Zone - New Madrid, Missouri - December 16 - 1811 - January 23 - San Francisco earthquake of 1906

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Based on the effects of these earthquakes, it can be estimated that they had a magnitude of 8.3 on the not-yet-invented Richter scale. As a result of the quakes, large areas sank into the earth, new lakes were formed (notably Reelfoot Lake, Tennessee), and the Mississippi River changed its course. Sandblows were common throughout the area, and their effects can still be seen from the air in cultivated fields. Church bells rang in Boston, Massachusetts. Since the area was less developed at the time, damage was minor compared to what would happen today.

Related Topics:
Richter scale - Reelfoot Lake - Tennessee - Mississippi River - Sandblows - Boston, Massachusetts

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A request dated January 13, 1814 by William Clark, the territorial governor, asked for federal relief for the "inhabitants of New Madrid County". This was possibly the first example of a request for disaster relief, which would later become the job of the Federal Emergency Management Agency (FEMA).

Related Topics:
January 13 - 1814 - William Clark - Federal Emergency Management Agency

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