Here's what you can expect to happen in the VIII range: "Steering of motor cars affected." Some masonry walls fall. Concrete irrigation ditches damaged," according to the U.S. Here are some of the things you can expect to happen in the VII range: "Difficult to stand. Louis area would experience a VII to VIII on an intensity scale that ranges from I to X, according to the scaled used by the U.S. In a repeat of the 1811-1812 earthquakes, the greater St. Geological Survey reports there is about a 10% chance of a 7.5 to 8 magnitude earthquake in the next 50 years.įor a New Madrid quake of a 6 magnitude, there is about a 30% chance in a 50-year window.Īn "intensity" scale that uses Roman numerals measures what impact people would experience in an earthquake. What's the probability of a repeat of the 1811-1812 New Madrid quakes? Here's a question and answer series of what you need to know about the earthquake threat in the Midwest and the New Madrid fault: "The ground surface moved up I think about 30 feet and that cut across the Mississippi River and that's the stories of the river running backward because the fault cut across there and dammed up the Mississippi River ," Bauer said in an interview with the BND. 7, 1812, earthquake caused the surface to rise about 30 feet at the Mississippi River and disrupted the river flow. Today, millions of people live where a repeat event would be most acutely felt.īob Bauer, principal engineering geologist for the Illinois State Geological Survey, said the Feb. Īt the time of the 18 quakes, the population of the St. The New Madrid earthquakes are believed to be the largest earthquakes east of the Rocky Mountains in the history of the United States, according to a report by the Missouri State Emergency Management Agency. 7, 1812, earthquake was probably the one most widely felt across North America, according to the U.S. President James Madison in Washington, D.C. 23, 1812, with a 7.5 magnitude and on Feb. 16, 1811 with an estimated 7.6 magnitude on Jan. This New Madrid area produced a series of three major earthquakes on Dec. This seismic zone covers the far southeastern section of Missouri, the extreme southern tip of Illinois, the far western tips of Tennessee and Kentucky and the northeastern section of Arkansas. It's near the more widely known area called the " New Madrid seismic zone," which surrounds a similarly named Missouri town on the banks of the Mississippi River about 164 miles south of St.
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