what is a fluvial tsunami

On January 23, 1812, an estimated 8.4-magnitude quake struck in nearly the same location, causing disastrous effects.

This series of large earthquakes ended in March, although there were aftershocks for a few more years. 1812. In all, it is believed that approximately 1,000 people died because of the earthquakes, though an accurate count is difficult to determine because of a lack of an accurate record of the Native American population in the area at the time. Church bells rang in Boston, thousands of miles away, from the shaking. On this day in 1812, the most violent of a series of earthquakes near Missouri causes a so-called fluvial tsunami in the Mississippi River, actually making the river run backward for several hours. The unusual seismic activity began at about 2 a.m. on December 16, 1811, when a strong tremor rocked the New Madrid region. At 7:15 a.m., an even more powerful quake erupted, now estimated to have had a magnitude of 8.6. This tremor literally knocked people off their feet and many people experienced nausea from the extensive rolling of the earth.
Many of the small islands in the middle of the river, often used as bases by river pirates, permanently disappeared. from:    http://www.history.com/this-day-in-history/earthquake-causes-fluvial-tsunami-in-mississippi, 1812 Fluvial Tsunami along the Mississippi. This one was estimated at an amazing 8.8-magnitude and was probably one of the strongest quakes in human history. The unusual seismic activity began at about 2 a.m. on December 16, 1811, when a strong tremor rocked the New Madrid region.

In all, it is believed that approximately 1,000 people died because of the earthquakes, though an accurate count is difficult to determine because of a lack of an accurate record of the Native American population in the area at the time. Sometimes, before a tsunami hits, there is a huge vacuum effect, sucking water from harbours and beaches. At 7:15 a.m., an even more powerful quake erupted, now estimated to have had a magnitude of 8.6. How fast is a tsunami? Large trees were snapped in two. Reportedly, the president’s wife, Dolley Madison, was awoken by the tremor in Washington, D.C. Fortunately, the death toll was smaller, as most of the survivors of the first earthquake were now living in tents, in which they could not be crushed. The earthquake also caused fissures–some as much as several hundred feet long–to open on the earth’s surface. This tremor literally knocked people off their feet and many people experienced nausea from the extensive rolling of the earth. Given that the area was sparsely populated and there weren’t many multi-story structures, the death toll was relatively low. The strongest of the tremors followed on February 7. Tsunamis can travel at speeds of about 500 miles or 805 kilometers an hour, almost as fast as a jet … Reportedly, the president’s wife, Dolley Madison, was awoken by the tremor in Washington, D.C. Fortunately, the death toll was smaller, as most of the survivors of the first earthquake were now living in tents, in which they could not be crushed. Large lakes, such as Reelfoot Lake in Tennessee and Big Lake at the Arkansas-Missouri border, were created by the earthquake as river water poured into new depressions. Many of the small islands in the middle of the river, often used as bases by river pirates, permanently disappeared.

Waterfalls were created in an instant; in one report, 30 boats were helplessly thrown over falls, killing the people on board. Brick walls were toppled in Cincinnati. 1812. Earthquake causes fluvial tsunami in Mississippi. Given that the area was sparsely populated and there weren’t many multi-story structures, the death toll was relatively low.

Large lakes, such as Reelfoot Lake in Tennessee and Big Lake at the Arkansas-Missouri border, were created by the earthquake as river water poured into new depressions. The city of New Madrid, located near the Mississippi River in present-day Arkansas, had about 1,000 residents at the time, mostly farmers, hunters and fur trappers. Large trees were snapped in two. A normal wind wave travels at about 90kmh, but a tsunami can race across the ocean at an incredible 970kmh!

Church bells rang in Boston, thousands of miles away, from the shaking. Waterfalls were created in an instant; in one report, 30 boats were helplessly thrown over falls, killing the people on board. The strongest of the tremors followed on February 7. Earthquake causes fluvial tsunami in Mississippi. This series of large earthquakes ended in March, although there were aftershocks for a few more years. from:    http://www.history.com/this-day-in-history/earthquake-causes-fluvial-tsunami-in-mississippi.

However, the quake did cause landslides that destroyed several communities, including Little Prairie, Missouri. On this day in 1812, the most violent of a series of earthquakes near Missouri causes a so-called fluvial tsunami in the Mississippi River, actually making the river run backward for several hours.

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