sciencehabit writes "The occasional quakes rattling the New Madrid Seismic Zone, a series of Midwestern faults named for a small town in the Missouri Bootheel, aren't aftershocks of the massive quakes that rocked our fledgling nation more than 2 centuries ago, a new study suggests. In other words, modern-day quakes are signs that the faults in the region are still accumulating stress—and sometimes releasing it as fresh rumblings."
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