What Caused the New Madrid Earthquake?

By Anna Duncan

The New Madrid earthquake was a series of devastating earthquakes that occurred in the Mississippi Valley in 1811 and 1812. These quakes were among the strongest ever recorded in the United States and caused extensive damage to the region. Scientists have been studying this event for years, trying to determine exactly what caused it.

What is the New Madrid Fault?

The New Madrid fault is a fault system located in the central United States, stretching from Arkansas to Illinois. It is named after the town of New Madrid, Missouri, which was near the epicenter of the 1811-1812 earthquakes.

The Cause of Earthquakes

Earthquakes are caused by movements along fault lines. When two tectonic plates move against each other, they can become stuck and pressure can build up. When this pressure is released suddenly, it causes seismic waves that create an earthquake.

What Caused the New Madrid Earthquake?

Scientists are still not entirely sure what caused the New Madrid earthquake. There are several theories, including:

  • Rebound Theory: This theory suggests that following the last ice age, glaciers put pressure on North America causing it to sink. As a result, when they melted and retreated back towards Canada around 13,000 years ago, North America rebounded upwards quickly causing stresses on faults like those at New Madrid.
  • Liquefaction Theory: Another theory suggests that liquefaction caused by heavy rains or flooding may have contributed to the earthquake.
  • Sunspots Theory: Some researchers believe that sunspots may have played a role in triggering these earthquakes as they coincide with higher solar activity which affects Earth’s magnetic fields.

The Aftermath

Regardless of what caused these earthquakes, their impact was felt across a wide area. The quakes were so strong that they reportedly rang church bells in Boston, Massachusetts, and caused the Mississippi River to flow backwards for a short time. Buildings were destroyed, and people were killed or injured.

Conclusion

In conclusion, the New Madrid earthquake was a catastrophic event that caused widespread destruction across the Mississippi Valley. While scientists are still uncertain about what specifically caused these earthquakes, it is clear that they had a significant impact on the region and serve as a reminder of the power of nature.