Earthquakes. You only need to worry about them if you're in San Francisco, right? Wrong. We have been making enormous changes to subterranean America, and Mother Earth, as always, has been making some of her own. The consequences for our real estate, our civil engineering, and our communities will be huge because they will include earthquakes most of us do not expect and cannot imagine. The era of human-induced earthquakes began in 1962 in Colorado, after millions of gallons of chemical-weapon waste was pumped underground in the Rockies. More than 1,500 quakes over the following seven years resulted. The Department of Energy plans to dump spent nuclear rods in the same way. Evidence of fracking's seismological impact continues to mount. Kathryn Miles descends into mines in the Northwest, dissects Mississippi levee engineering studies, uncovers the horrific risks of an earthquake in the Northeast, and interviews the seismologists, structual engineers, and emergency managers around the country who are addressing this ground shaking threat.