A magnitude 3.5 earthquake struck southern Illinois in the early hours of Tuesday morning, according to the U.S. Geological Survey (USGS). The tremor was strong enough to be felt across the river in St. Louis, Missouri, waking some residents and sparking fresh conversations about the region’s seismic risk.
This serves as a reminder that Missouri sits on a major fault line the New Madrid Seismic Zone responsible for some of the most powerful earthquakes in U.S. history. While Tuesday’s quake was relatively minor, it’s a signal that the ground beneath us is still active.
