Before revision: 1811-1812 New Madrid EarthquakeThe 1811-1812 New Madrid earthquakes were caused by earthquakes on the Mississippi River, and represent bank failure caused by tectonic activity in the New Madrid Seismic Zone (NMSZ).1811–1812 New Madrid earthquakes The NMSZ is the result of a failed rift system which remains weak today, and thus is prone to faulting and earthquake activity.
After revision: 1811–1812 New Madrid earthquakeThe 1811–12 New Madrid earthquakes were caused by earthquakes on the Mississippi River, and represent bank failure caused by tectonic activity in the New Madrid Seismic Zone (NMSZ).1811–1812 New Madrid earthquakes The NMSZ is the result of a failed rift system which remains weak today, and thus is prone to faulting and earthquake activity.