How Does the New Madrid Fault Line Run?

By Alice Nichols

The New Madrid Fault Line is one of the most significant geological features in the United States. It has been responsible for some of the largest earthquakes recorded in North America. The fault line runs through several states, including Missouri, Arkansas, Tennessee, Kentucky, and Illinois.

History of the New Madrid Fault Line

The fault line is named after the town of New Madrid, Missouri, which experienced a series of devastating earthquakes in 1811 and 1812. These earthquakes were some of the most powerful ever recorded in North America with magnitudes estimated to be around 7.5 to 7.9 on the Richter scale.

Scientists believe that the New Madrid Fault Line formed around 500 million years ago when the North American continent was still forming. Over time, tectonic activity caused stress to build up along this fault line, resulting in the earthquakes we see today.

How Does the Fault Line Run?

The New Madrid Fault Line runs roughly parallel to the Mississippi River and extends for about 150 miles from Cairo, Illinois to Marked Tree, Arkansas. It is made up of a series of smaller faults that are connected together.

The Reelfoot Rift

One of these smaller faults is known as the Reelfoot Rift. The Reelfoot Rift is responsible for creating a series of lakes in western Tennessee known as the Reelfoot Lake system.

Earthquakes Along the Fault Line

Since its discovery by scientists over a century ago, there have been several significant earthquakes along this fault line.

In addition to the earthquakes in 1811 and 1812 that caused widespread damage and devastation across several states near its epicenter, there have been other significant quakes such as:

  • The 1895 Charleston Earthquake which occurred along a section of this fault line.
  • The 1968 Illinois earthquake which registered a magnitude of 5.4 on the Richter scale.
  • The 1990 earthquake in Missouri that registered a magnitude of 4.6 on the Richter scale.

Conclusion

The New Madrid Fault Line is a significant geological feature that has played a crucial role in shaping the landscape of several states in the United States. Scientists continue to study this fault line to better understand its behavior and predict future earthquakes along its length.