There were four that occurred from December 1811 to February 1812 that were all in the M7.0 range, near New Madrid, Missouri. Since 1974, over 4,000 have occurred, most of which were too small to be felt.
Missouri
Missouri tends to have a high risk of earthquakes occurring because it has a fault line called the New Madrid that runs through it. Missouri is one of the most dangerous states to live in in terms of earthquake activity.
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Missouri lies on the second largest fault line in North America. This fault line is over twenty years past due for major seismic activity. The last great earthquake in Missouri was so violent that it created East St. Louis.
New Madrid Missouri
Most recent earthquakes in Missouri: * M1.6 4km SSE of Lilbourn, Missouri 2012-11-07 23:15:21 * M1.1 6km SSW of New Madrid, Missouri 2012-11-02 23:41:06 * M2.5 5km E of Steele, Missouri 2012-10-31 12:05:59 Largest Earthquake in Missouri: 1812 February 7, Magnitude ~8
The "New Madrid" fault line runs through it.
This is debatable, but the three worst earthquakes in the U.S. were likely the San Francisco earthquake of 1906, the Alaskan earthquake of 1964, and the New Madrid, Missouri earthquake, which was in the early 19th century.
No the New Madrid Earthquake just rang the liberty bell. The earthquake's epicenter was in the boot heel of Missouri, but the earthquake was so strong that it was felt as far away as New York, Canada, and Washington D.C.
In 1811-1812 the New Madrid earthquakes took place. I'm not sure if this is the one you mean, but I hope so. The 1812 Febuary earthquake had a magnitude of 7.7 on the Richter scale.
The state of Missouri has a higher risk of earthquakes because it sits on the edges of several plate boundaries. The series of faults located in the state are called The New Madrid Fault.
The 1812 earthquake, known as the New Madrid earthquake, occurred in the central United States near the town of New Madrid, Missouri. It is considered one of the largest earthquakes to ever hit North America.