
Today’s earthquakes could be aftershocks from centuries-old quakes in the 1800s, a new study reveals.
Back in the 19th century some of the strongest earthquakes in recorded US history struck North America’s continental interior.

Today’s earthquakes could be aftershocks from centuries-old quakes in the 1800s, a new study reveals.
Back in the 19th century some of the strongest earthquakes in recorded US history struck North America’s continental interior.