Most people don't know that the northeastern United States as well as Canada's Maritime Provinces and Gaspé Peninisula is an earthquake zone on the same order as the more famous ones on North America's West Coast. The difference is that it hasn't been as active in historical times. Should a big one strike New York City, deaths would probably run into the hundreds of thousands. It's not just because the building codes don't mandate taking quakes into account, but also because of the underlying bedrock. It is extremely hard and a major quake would cause it to shatter. So the damage would be extensive and massive.
Another earthquake zone that doesn't get much mention is the New Madrid fault along the Mississippi River in Missouri. The last major tremblor there was 200 years ago in 1811. A major quake now would wreck St. Louis and Memphis for sure and more than likely scores of other towns and cities. The death toll would be significant there as well. Of course, when it comes to earthquakes, there's no place on our planet's surface that is immune.
Today's quakes in the American Northeast as well as in southern Colorado and northern New Mexico were notable because there have been so few there in historical times. Geologically, it's another story, particularly in Colorado and New Mexico. The area in those states that was hit today is littered with many extinct volcanoes and calderas. The second largest rift valley on the planet--only the Great Rift Valley running from Syria to Mozambique is bigger--lies in the region. West of Albuquerque, New Mexico lies one of the most extensive lava fields in the lower 48 flanking both sides of I-40. I myself have visited some of the old volcanoes in Colorado and New Mexico. They're quiet now, but should they ever awaken...
I'm out here in northern Colorado along with Magwitch and didn't feel this morning's tremblor. It will be interesting to see if the WTS tries to tie in the day's events with its end-of-the-world eschatology. I wouldn't be surprised is someone in Brooklyn, Patterson, or Wallkill isn't working on some kind of angle right now.