The United States Geological Survey warned that nearly 75% of the U.S. could face potentially damaging earthquakes and intense ground shaking in the next 100 years.

New Madrid Seismic Zone is the most active seismic area in the United States east of the Rocky Mountains. Getty Images/iStockphoto A swarm of earthquakes rattled along the New Madrid fault line ...

New Madrid Seismic Zone is the most active seismic area in the United States east of the Rocky Mountains. Getty Images/iStockphoto A swarm of earthquakes rattled along the New Madrid fault line ...

New Madrid Seismic Zone is the most active seismic area in the United States east of the Rocky Mountains. Getty Images/iStockphoto A swarm of earthquakes rattled along the New Madrid fault line ...

A map displays the likelihood of damaging earthquake shaking in the United States over the next 100 years. This puts millions of people across the U.S. at risk.

A swarm of earthquakes hit the New Madrid fault line in the Midwest on Monday. This fault is long overdue for a major quake, but this swarm does not necessarily mean 'The Big One' is coming.

New Madrid Seismic Zone is the most active seismic area in the United States east of the Rocky Mountains. Getty Images/iStockphoto A swarm of earthquakes rattled along the New Madrid fault line ...

New Madrid Seismic Zone is the most active seismic area in the United States east of the Rocky Mountains. Getty Images/iStockphoto A swarm of earthquakes rattled along the New Madrid fault line ...

A swarm of earthquakes — 7 total — shook along the New Madrid fault line. ... New Madrid Seismic Zone is the most active seismic area in the United States east of the Rocky Mountains.