Once Every 3,400 Years

Not to freak you out or anything, but:

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.