In 1811 and 1812, some of the most powerful earthquakes ever hit North America, changing the flow of major rivers and altering the landscape. If you think they were on the west coast, you'd be mistaken: these earthquakes hit eastern Missouri, around New Madrid. That was 200 years ago, so the few residents were quite shaken up, but no concrete buildings went toppling, no gas-lines ruptured, so while an interesting story, these 8+ Richter earthquakes didn't have the impact they'd have today. An isolated incident? Probably not.
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