Check a map of earthquake hot spots in the continental United States and you'll see plenty of bright red danger zones: in the West, around the southeast corner of Missouri, and in one small section of the East Coast.
No, not Virginia, where a mid-sized quake just rattled millions. It's in South Carolina, where a quake estimated at magnitude 7.3 struck 125 years ago this week, killing dozens and ravaging the port city of Charleston.
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