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More to Worry About: Earthquakes

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Add another little something to the list of things that could reorganize life a bit and take a bite out of real estate values: earthquakes. "A new analysis of 383 quakes in a 15,000-square-mile area around New York City estimates that a magnitude-5 earthquake in or around the city occurs on average once a century, and a magnitude-6 or larger quake occurs once every 670 years. An even larger magnitude-7 is estimated at once every 3,400 years." So, like, when was the last magnitude -7? [NYT]