Geographic Extent
The 150-mile (240 km) long fault system, which extends into five states, stretches southward from Cairo, Illinois; through Hayti, Caruthersville and New Madrid in Missouri; through Blytheville into Marked Tree in Arkansas. It also covers a part of West Tennessee, near Reelfoot Lake, extending southeast into Dyersburg.
Most of the seismicity is located between 3 and 15 miles (4.8 and 24 km) beneath the Earth's surface.
Read more about this topic: New Madrid Seismic Zone
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—Henry David Thoreau (1817–1862)