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The New Madrid seismic zone (NMSZ), sometimes called the New Madrid fault line (or fault zone or fault system), is a major seismic zone and a prolific source of intraplate earthquakes (earthquakes within a tectonic plate) in the Southern and Midwestern United States, stretching to the southwest from New Madrid, Missouri.
The 1811–1812 New Madrid earthquakes were a series of intense intraplate earthquakes beginning with an initial earthquake of moment magnitude 7.2–8.2 on December 16, 1811, followed by a moment magnitude 7.4 aftershock on the same day. Two additional earthquakes of similar magnitude followed in January and February 1812.
Since the three damaging earthquakes that occurred in the American Midwest and the United States East Coast (1755 Cape Ann, 1811–1812 New Madrid, 1886 Charleston) were well known, it became apparent to settlers that the earthquake hazard was different in California.
A magnitude 5 earthquake may affect 5-15 times larger of an area in the New Madrid Seismic Zone compared to California, largely due to the crustal geology of the two areas.
An undated photo from the US Geological Survey depicts a landslide trench and ridge in the Chickasaw Bluffs, east of Reelfoot Lake, Tennessee, resulting from the 1811 to 1812 New Madrid earthquakes.
August 23, 2011 2011 Virginia earthquake Massachusetts: 5.9 November 18, 1755 1755 Cape Ann earthquake Michigan: 4.6 M L: August 10, 1947 [48] Minnesota: 4.6 M L: July 9, 1975 1975 Morris earthquake Mississippi: 7.6–7.9 December 16, 1811 1811–1812 New Madrid earthquakes Missouri: 7.6–7.9 December 16, 1811 1811–1812 New Madrid ...
Southern California's last "Big One" was in 1857, when an earthquake with a magnitude of roughly 7.9 ruptured 225 miles of fault on the San Andreas, between Monterey and San Bernardino counties.
The 2011 Colorado earthquake caused damage in Segundo, Cokedale, Valdez and Trinidad. Rockslides occurred on State Highway 12. — — 23 [77] United States, Virginia, 11 km southwest of Mineral: 5.8 6.0 VIII The 2011 Virginia earthquake was felt by more people than any other quake in U.S. history, with tremors also being felt in Canada. [78]