Everything Everywhere Daily · Wednesday, September 23, 2026
The New Madrid seismic zone is an intraplate earthquake zone, meaning earthquakes occur within the interior of a tectonic plate, which is rare. Scientists believe this zone formed from a failed continental rifting event about 600 million years ago, creating weak points in the Earth's crust that can be reactivated by ongoing tectonic activity.
“What makes the New Madrid seismic zone unique is that it is an intraplate earthquake zone.”
“This means earthquakes occur within the interior of a tectonic plate.”
“The New Madrid seismic zone appears to form roughly 600 million years ago, as shown by deformed ancient rocks.”