<p>In the 1800s, some of the strongest earthquakes in recorded U.S. history struck North America’s continental interior. Almost two centuries later, the central and eastern United States may still be experiencing aftershocks from those events, <a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2023JB026482">a new study</a> finds.</p>