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Check the Quake-O-Meter! First visit to our site? The Lake County uplift, about 50 kilometers long and 23 kilometers wide, stands above the surrounding Mississippi River Valley by as much as 10 meters in parts of southwest Kentucky, southeast Missouri, and northwest Tennessee.
The uplift apparently resulted from vertical movement along several, ancient, subsurface faults. Most of the uplift occurred during prehistoric earthquakes. A strong correlation exists between modern seismicity and the uplift, indicating that stresses that produced the uplift may still exist today.
Within the Lake County uplift, Tiptonville dome, which is about 14 kilometers in width and 11 kilometers in length, shows the largest upwarping and the highest topographic relief. It is bounded on the east by 3-m high Reelfoot scarp. Although most of Tiptonville dome formed between and 2, years ago, additional uplifting deformed the northwest and southeast parts of the dome during the earthquakes of This powerful earthquake was felt widely over the entire eastern United States.
Perceptible ground shaking was in the range of one to three minutes depending upon the observers location. The ground motions were described as most alarming and frightening in places like Nashville, Tennessee, and Louisville, Kentucky. Reports also describe houses and other structures being severely shaken with many chimneys knocked down. In the epicentral area the ground surface was described as in great convulsion with sand and water ejected tens of feet into the air liquefaction.
A large event felt on the East Coast that is sometimes regarded as the fourth principal earthquake of the sequence. The event is described as "severe" at New Bourbon, Missouri, and was described by boatman John Bradbury, who was moored to a small island south of New Madrid, as "terrible, but not equal to the first". Hough believes that this large aftershock occurred around dawn in the New Madrid region near the surface projection of the Reelfoot fault. The second principal shock of the sequence.
It is difficult to assign intensities to the principal shocks that occurred after because many of the published accounts describe the cumulative effects of all the earthquakes and because the Ohio River was iced over, so there was little river traffic and fewer human observers. Using the December 16 earthquake as a standard, however, there is a general consensus that this earthquake was the smallest of the three principals.
The meizoseismal area was characterized by general ground warping, ejections, fissuring, severe landslides, and caving of stream banks.
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